Nothing worse than you tubers giving their life stories while attempting to demonstrate something.Your video was sublime you made it easy to understand and straight to the point.Thanks
YOU ARE A KING!! Wasted 3 hour to get out the spring then I think to go watch some youtube tutorial, and I found your very easy step without any extra tool! Thanks so much! I'm now go back and change the springs in 2 minute. :D
A greeting, my friend, I want to thank you for the technique in this video, I used it in a clutch gy6 150 and I put you springs 1500RPM and served me the technique of the thin screwdriver to fit the new springs, i was very easy, otherwise i was been very difficult, even try with a pair of tweezers and are very hard. :)
90GTVert sorry but what is best, increase or decrease rpm..? I watch a video were someone explained the yellow clutch springs are the stiffest..? I thought was the red..🤔
Thanks for replying 90gtvert . Yes. Tried that. It just makes the tension on the lever tighter or slackens it off. When I can't push the scoot backwards I can push it forwards so I know the brake isn't sticking on. When it's up on the stand I can move the rear wheel forwards (not very smooth though) but I can't rotate the wheel backwards. If it was a car it's like it's stuck in gear. Not sure what else to check...
If you pop the CVT cover off it will be obvious if the clutch has anything to do with this. Normally when you spin the rear wheel only the bell will spin. If the whole rear pulley or both pulleys spin the clutch is engaged when it shouldn't be. Could be a broken spring or something like that. If the pulleys aren't rotating then it's either in your gearbox or you have some kind of clearance issue.
Nice video. Before I start working on my scooter would you think I have a clutch problem. I can't push it backwards when the engine is running or switched off. It's like the back brake is on but I've had the back wheel off and all seems ok there. Seems to move forward ok with or without the engine running. I'm a newbie when it comes to working on these so any help would be appreciated. Thanks from the uk.
No experience with the Zip, but I generally recommend that people get 2-3 sets of springs and try them. Some people have different preferences, and also the clutch doesn't always work the same on every scoot.
They're fine. The way some clutches are made you can't fit them if they were wrong. You can see in the vid the short side wouldn't be able to hook up where the long side goes. Really doesn't matter otherwise.
I would at least clean out the belt dust, take a look at the roller weights, check the condition of the belt, measure the width of the belt and replace if it's 1mm or more under original spec (although quoted as 18mm many really start at about 17.5-17.7mm wide). If you haven't checked the valve lash since the PDI, it's about time to check and adjust if needed. There's a maintenance schedule in the tech library at my site under basic info and guides.
Great video I'm sorry to ask I purchased my son a rxf 50cc dirt bike full automatic. He is getting quite bored of the acceleration. do you have and tips how to modify this type of centrifugal clutch for mini motor thanks.
I'd probably consider a swap in that case. Check out the prices on larger semi-auto or manual transmissions. You can get a 125 fairly cheap, the last time I looked, and that will be a big upgrade in power. The toughest part with swapping auto to manual is figuring out how to actuate the clutch and rear brake, but if there are manual versions of that bike you can probably get whatever parts are needed. If you get a semi-auto, it's got a shifter but no clutch so you don't have to worry about that, but you don't get the same control as the manual and the manual tends to be a bit faster from what I've seen.
Great video. You are the best teacher. I have a question. From the Genuine Roughhouse R50 Sport scooter which is the factory specification of these parts: The weight of the rollers? What is the RPM of the Compression Spring? What is the RPM of the Clutch Spring?
Spring RPM is easy. They would be 0RPM. Aftermarket springs are supposed to be rated by how high the engagement RPM rises beyond stock, so stock would be 0RPM. A quick google search says 7.5-8.5g 16x13 rollers. Can't tell you for sure if that's accurate.
I am over 2000 miles now, and i was wondering what do i need to do at this mileage with my clutch and belt or rollers in my CVT? I mean what is necessary at this mileage? I am not having any problems now, and i have replaced my spark plug, gear oil, and motor oil, both oils have been done on time, and the spark plug was a little white when i replaced it.
Usually more weight and/or increasing friction. It's not common for people to add weight to a clutch though. Is it slipping a lot or you just think it would be better if it locked more abruptly? It is normal for clutches to slip in and a lot of times if the clutch does grab hard the belt will then slip instead.
@@49ccscoot it works as normally or as intented atm, but i would like more grab as soon as i hit the throttle, but i suppose it could be the belt slipping
I can not imagine how you exchange springs from clutch, the springs go already broken before you already installed, only times Tip of me the best you switch as follows Fuse discs / clips from clutch pins remove all 3 clutch pieces evenly from the clutch carrier , After hanging the new springs all 3 couplings on coupling carriers / pins draufziehen so the springs are also not pulled out. ;-)
My scooter's back wheel spins on its own as soon as I start it and the idle screw is on the minimum, when i inspected the cluch I found one of these springs brocken. Could it be the problem? Please answer. And by the way,i love your work man!
The spark plug has to be considered to figure out the compression ratio. If you are interested in all of the details about finding CR, check out this video : ruclips.net/video/87aHTfxatag/видео.html
Can you tell me if the 1000 rpm springs are the same as the stock ones? Iam looking for a little better pick up en more power take off.. Iam using the stock clutch springs now. I dont know if 1000 rpm is just fine or do i need to go for the 1500 rpm ones.
The way that they are supposed to be rated is that a 1000RPM spring will get revs up 1000RPM more than stock. Doesn't always work that way, but that's the idea. I usually buy a set of 1000, 1500 and 2000RPM springs (or soft, medium, stiff) and test them to see what works best. Sometimes springs are too stiff and engagement doesn't happen till the CVT is already shifting and you lose the best takeoff ratio so you can't just put the stiffest in and assume they're best.
do you have any advice about upjetting carbs I have a 21mm carb tnt with 70cc airsal kit, malossi fly clutch, polini varaitor and at top end revs bike back fires and bogs till it's slowed down again
+Luke Sykes Check your plug immediately after it does that and you should know if it's rich or lean. Change jets accordingly. More info : www.49ccscoot.com/faq/carbtune.html
An owner's manual wouldn't show that and some service manuals may not. In stock form many are sealed now so you can't even adjust them without unsealing the carb. There are 2 links below that may be of use. 49ccscoot.proboards.com/thread/429/idle-mixture-adjustment 49ccscoot.proboards.com/thread/5148/unsealing-carbs-mixture-tamper-screws
I have a 150cc jonway, GY6 engine. I have replaced carb, plug, cdi, plug boot, gas, filter, compression showed I was low, so I adjusted valves to .05 clearance, & replaced fuel lines. It will NOT start unless I spray start fluid in carb, then it idles and runs great. I don't know what else to do.
The springs resist centrifugal force trying to throw the clutch shoes outward where they would mate up with the clutch bell and drive the rear wheel (through the output shaft and gearbox). Stiffer springs require more force (RPM) to overcome so the clutch doesn't engage till later.
I have a yamaha razz 50 cc. How do i check if the clutch and spring are worn out? Also the carb is always dirty in the outside its like its leaking petrol, what should i do?
The most obvious thing is to observe how the scooter takes off from a complete stop. If the rear wheel is always engaged and trying to spin you either have too high of an idle speed or the clutch is not functioning. If it takes essentially no throttle to move, then again it may be that the clutch is engaging too fast from worn springs or elongated spring grooves that create lower tension. If it does the opposite and slips a lot on take off then your clutch bell or shoes may be worn or glazed or the oil used may be wrong for your transmission. Your Razz should have a wet clutch, unlike the CVT driven scoots, so if you go to remove the cover remember that oil will come out and it will need to be replaced. Find a service manual and Yamaha should give some sport of specs to check the clutch by measuring clutch/bell diameters or clearance.
***** the scooter has done more than 37,000kms, and ave only changed the piston and rings. Should i also change the crank shaft, carb, clutch and springs? Also the airfilter is worn out and i need to change it. Anothet qn, how many turns out should i make on the fuel air mix screw?
+EpicScootModz Try all the clutch springs and find out which works best for your application. Watch when the belt starts to move before takeoff. If the belt moves much before the clutch engages, you could miss out on the full advantage of the CVT's "low gear" and may want to use softer springs.
Hi I have a Kymco super 9 a/c airsal 70cc kit nakaru 21mm carb 6/7 gram rollers polini varaitor with a malossi fly clutch with white springs standard belt and standard torque spring still lagging a bit
+Luke Sykes If the revs aren't up initially, try stiffer clutch springs. If it's OK taking off but too low after, then you may need lighter rollers or a stiffer contra.
You can try it. Most of my tuning is trial and error. With patience and writing down what results you get from each setup, you can find what works best.
@90GTVert i have the HOCA adjustable clutch for 139qmb. what are the adjustable spring loads for? is it to engage the clutch quicker or does it put more strain on the clutch itself?
I didn't know HOCA made a clutch that had any adjustment beyond just the standard clutch spring set that changes engagement RPM. Are you sure it's not a DrPulley or some other brand?
@@49ccscoot First, thanks for the reply....yes, I went out to check in better detail and I think there are only 4 screws I have to take out. I got speedy 50 scooter a few years ago and it has had nothing but problems. Within the first year I had it both tires went flat, I had to replace the headlamp 4 times, the back left turn signal and now the brake light is burned out....I will never go back to the dealer I got it from....
+conceal It only matters if you're starting on a hill.. the first say 10MPH or so. Regardless, you need to try them and see if you really want the best performance. Not all clutches and springs act exactly the same and the way the rest of the CVT is setup will matter. There is no easy answer of X springs work best in all cases.
Maybe a little screwdriver or pretty much anything with enough strength that can be wedged in as shown. Or just get some picks. They have many uses and they're cheap. amzn.to/3LwRw0m
![Noob To Max With DRAGON REWORK In Blox Fruits [FULL MOVIE]](http://i.ytimg.com/vi/LnBMOinoOvA/mqdefault.jpg)
Nothing worse than you tubers giving their life stories while attempting to demonstrate something.Your video was sublime you made it easy to understand and straight to the point.Thanks
YOU ARE A KING!!
Wasted 3 hour to get out the spring then I think to go watch some youtube tutorial, and I found your very easy step without any extra tool!
Thanks so much! I'm now go back and change the springs in 2 minute. :D
hggird lol Thanks. Happy launches. :)
A greeting, my friend, I want to thank you for the technique in this video, I used it in a clutch gy6 150 and I put you springs 1500RPM and served me the technique of the thin screwdriver to fit the new springs, i was very easy, otherwise i was been very difficult, even try with a pair of tweezers and are very hard. :)
Glad it helped!
Lighter rollers and stiffer contra springs both increase RPM. Heavier rollers and softer contra springs both decrease RPM.
90GTVert sorry but what is best, increase or decrease rpm..?
I watch a video were someone explained the yellow clutch springs are the stiffest..?
I thought was the red..🤔
God thanks for this. took just a few minutes to change all my springs out!
Thanks for replying 90gtvert . Yes. Tried that. It just makes the tension on the lever tighter or slackens it off. When I can't push the scoot backwards I can push it forwards so I know the brake isn't sticking on. When it's up on the stand I can move the rear wheel forwards (not very smooth though) but I can't rotate the wheel backwards. If it was a car it's like it's stuck in gear. Not sure what else to check...
If you pop the CVT cover off it will be obvious if the clutch has anything to do with this. Normally when you spin the rear wheel only the bell will spin. If the whole rear pulley or both pulleys spin the clutch is engaged when it shouldn't be. Could be a broken spring or something like that. If the pulleys aren't rotating then it's either in your gearbox or you have some kind of clearance issue.
Nice video. Before I start working on my scooter would you think I have a clutch problem. I can't push it backwards when the engine is running or switched off. It's like the back brake is on but I've had the back wheel off and all seems ok there. Seems to move forward ok with or without the engine running. I'm a newbie when it comes to working on these so any help would be appreciated. Thanks from the uk.
Have you tried turning the rear brake adjuster out a turn or two to see if it helps?
Thks again four your video whitch best coloure springs you recommended to use on Piaggio Zip 50 2T from 2015 thank you again
No experience with the Zip, but I generally recommend that people get 2-3 sets of springs and try them. Some people have different preferences, and also the clutch doesn't always work the same on every scoot.
They're fine. The way some clutches are made you can't fit them if they were wrong. You can see in the vid the short side wouldn't be able to hook up where the long side goes. Really doesn't matter otherwise.
I would at least clean out the belt dust, take a look at the roller weights, check the condition of the belt, measure the width of the belt and replace if it's 1mm or more under original spec (although quoted as 18mm many really start at about 17.5-17.7mm wide). If you haven't checked the valve lash since the PDI, it's about time to check and adjust if needed. There's a maintenance schedule in the tech library at my site under basic info and guides.
Thanks I'll give it a try and let you know what has caused it.
Great set of videos from you on here
i change to a lighter roller equal to change a softer contra spring ??
Great video I'm sorry to ask I purchased my son a rxf 50cc dirt bike full automatic. He is getting quite bored of the acceleration. do you have and tips how to modify this type of centrifugal clutch for mini motor thanks.
I'd probably consider a swap in that case. Check out the prices on larger semi-auto or manual transmissions. You can get a 125 fairly cheap, the last time I looked, and that will be a big upgrade in power. The toughest part with swapping auto to manual is figuring out how to actuate the clutch and rear brake, but if there are manual versions of that bike you can probably get whatever parts are needed. If you get a semi-auto, it's got a shifter but no clutch so you don't have to worry about that, but you don't get the same control as the manual and the manual tends to be a bit faster from what I've seen.
Great video. You are the best teacher. I have a question.
From the Genuine Roughhouse R50 Sport scooter which is the factory specification of these parts:
The weight of the rollers?
What is the RPM of the Compression Spring?
What is the RPM of the Clutch Spring?
Spring RPM is easy. They would be 0RPM. Aftermarket springs are supposed to be rated by how high the engagement RPM rises beyond stock, so stock would be 0RPM. A quick google search says 7.5-8.5g 16x13 rollers. Can't tell you for sure if that's accurate.
@@49ccscoot Thanks for your quick response. It has helped me a lot. Keep it up with your video because they are very instructive.
Why did you decide to change the springs? I am a big guy, too. What does this change do to performance, uphill, a little more speed, etc?
Clutch springs help with the initial takeoff, getting RPM up off the line.
www.49ccscoot.com/faq/clutchsprings.html
So I have a 2000 rpm spring and a 1500 rpms spring in my 50cc what one is better to run im a light guy I'm new to all this stuff sorry
Great video
Thanks great video really helped 👍🏻
I am over 2000 miles now, and i was wondering what do i need to do at this mileage with my clutch and belt or rollers in my CVT? I mean what is necessary at this mileage? I am not having any problems now, and i have replaced my spark plug, gear oil, and motor oil, both oils have been done on time, and the spark plug was a little white when i replaced it.
Very good instruction
Hey do you have a good way to make a centri clutch bite harder, it does its job fine, but id like it to lock in harder.
Usually more weight and/or increasing friction. It's not common for people to add weight to a clutch though. Is it slipping a lot or you just think it would be better if it locked more abruptly? It is normal for clutches to slip in and a lot of times if the clutch does grab hard the belt will then slip instead.
@@49ccscoot it works as normally or as intented atm, but i would like more grab as soon as i hit the throttle, but i suppose it could be the belt slipping
I can not imagine how you exchange springs from clutch, the springs go already broken before you already installed, only times Tip of me the best you switch as follows Fuse discs / clips from clutch pins remove all 3 clutch pieces evenly from the clutch carrier , After hanging the new springs all 3 couplings on coupling carriers / pins draufziehen so the springs are also not pulled out. ;-)
Hello
What sport clutch you can recomand for better performance ?
Thanks.
Stage6 MKII Torque Control :
ruclips.net/video/dV2qgdgmwkM/видео.html
My scooter's back wheel spins on its own as soon as I start it and the idle screw is on the minimum, when i inspected the cluch I found one of these springs brocken. Could it be the problem? Please answer. And by the way,i love your work man!
Yes, that's likely the issue. If the spring is broken, one shoe is contacting the bell all of the time. Not good. Fix ASAP!
When the piston up to TDC point, we pour water into the girder and the result is compression ratio. So is it deductible? spark plug
The spark plug has to be considered to figure out the compression ratio. If you are interested in all of the details about finding CR, check out this video : ruclips.net/video/87aHTfxatag/видео.html
Can you tell me if the 1000 rpm springs are the same as the stock ones? Iam looking for a little better pick up en more power take off.. Iam using the stock clutch springs now.
I dont know if 1000 rpm is just fine or do i need to go for the 1500 rpm ones.
The way that they are supposed to be rated is that a 1000RPM spring will get revs up 1000RPM more than stock. Doesn't always work that way, but that's the idea. I usually buy a set of 1000, 1500 and 2000RPM springs (or soft, medium, stiff) and test them to see what works best. Sometimes springs are too stiff and engagement doesn't happen till the CVT is already shifting and you lose the best takeoff ratio so you can't just put the stiffest in and assume they're best.
do you have any advice about upjetting carbs I have a 21mm carb tnt with 70cc airsal kit, malossi fly clutch, polini varaitor and at top end revs bike back fires and bogs till it's slowed down again
+Luke Sykes Check your plug immediately after it does that and you should know if it's rich or lean. Change jets accordingly. More info : www.49ccscoot.com/faq/carbtune.html
Thanks!
I have the manual, but i havent read anywhere about adjusting the fuel air mixture.
An owner's manual wouldn't show that and some service manuals may not. In stock form many are sealed now so you can't even adjust them without unsealing the carb. There are 2 links below that may be of use.
49ccscoot.proboards.com/thread/429/idle-mixture-adjustment
49ccscoot.proboards.com/thread/5148/unsealing-carbs-mixture-tamper-screws
Please tell me about this question, thank you
I have a 150cc jonway, GY6 engine. I have replaced carb, plug, cdi, plug boot, gas, filter, compression showed I was low, so I adjusted valves to .05 clearance, & replaced fuel lines. It will NOT start unless I spray start fluid in carb, then it idles and runs great. I don't know what else to do.
+Christopher Lauderdale Did the compression test show a good reading (~150psi) post valve adjustment?
What purpose do the springs serve? How does it work?
The springs resist centrifugal force trying to throw the clutch shoes outward where they would mate up with the clutch bell and drive the rear wheel (through the output shaft and gearbox). Stiffer springs require more force (RPM) to overcome so the clutch doesn't engage till later.
so if i install 2000 rpm clutch springs what should i put in for roller weights to get the best top speed?
They're kind of unrelated. Put in whatever rollers keep the RPM where your engine needs it to get top speed. Gotta tune if you want the best speed.
I have a yamaha razz 50 cc. How do i check if the clutch and spring are worn out? Also the carb is always dirty in the outside its like its leaking petrol, what should i do?
The most obvious thing is to observe how the scooter takes off from a complete stop. If the rear wheel is always engaged and trying to spin you either have too high of an idle speed or the clutch is not functioning. If it takes essentially no throttle to move, then again it may be that the clutch is engaging too fast from worn springs or elongated spring grooves that create lower tension. If it does the opposite and slips a lot on take off then your clutch bell or shoes may be worn or glazed or the oil used may be wrong for your transmission. Your Razz should have a wet clutch, unlike the CVT driven scoots, so if you go to remove the cover remember that oil will come out and it will need to be replaced. Find a service manual and Yamaha should give some sport of specs to check the clutch by measuring clutch/bell diameters or clearance.
***** the scooter has done more than 37,000kms, and ave only changed the piston and rings. Should i also change the crank shaft, carb, clutch and springs? Also the airfilter is worn out and i need to change it. Anothet qn, how many turns out should i make on the fuel air mix screw?
It sounds like you need to do a full inspection of the engine and CVT. I would try to find a service manual and go through it.
I just bought a medium torque spring and 3 different clutch spring i want good pull out and good top end what do u suggest?
+EpicScootModz Try all the clutch springs and find out which works best for your application. Watch when the belt starts to move before takeoff. If the belt moves much before the clutch engages, you could miss out on the full advantage of the CVT's "low gear" and may want to use softer springs.
Ok thanks I have soft clutch springs right now and my scooter pulls out super slow the clutch only engages at 20kmh
Hi I have a Kymco super 9 a/c airsal 70cc kit nakaru 21mm carb 6/7 gram rollers polini varaitor with a malossi fly clutch with white springs standard belt and standard torque spring still lagging a bit
+Luke Sykes If the revs aren't up initially, try stiffer clutch springs. If it's OK taking off but too low after, then you may need lighter rollers or a stiffer contra.
Cheers pal
+90GTVert every time I try my 5 gram rollers it's revving out could I do 5/6 would that work better thanks again
You can try it. Most of my tuning is trial and error. With patience and writing down what results you get from each setup, you can find what works best.
+90GTVert ok thanks have you got Facebook pal
@90GTVert i have the HOCA adjustable clutch for 139qmb. what are the adjustable spring loads for? is it to engage the clutch quicker or does it put more strain on the clutch itself?
I didn't know HOCA made a clutch that had any adjustment beyond just the standard clutch spring set that changes engagement RPM. Are you sure it's not a DrPulley or some other brand?
+90GTVert www.partsforscooters.com/169-187_QMB-GY6-50cc_Transmission-Kit?sc=34&category=132709 this is what i have.
+90GTVert so sorry it's not HOCA...idk why i thought it was? (the fuck is wrong with me lol)
+90GTVert but what are the adjustable clutch springs for? like does it help make it engage faster? or what? lol idk
Is it hard to change the brake light out???
Depends on the scooter. Many can be done by either reaching behind and getting the bulb out or removing a couple of bolts or screws for access.
@@49ccscoot First, thanks for the reply....yes, I went out to check in better detail and I think there are only 4 screws I have to take out. I got speedy 50 scooter a few years ago and it has had nothing but problems. Within the first year I had it both tires went flat, I had to replace the headlamp 4 times, the back left turn signal and now the brake light is burned out....I will never go back to the dealer I got it from....
would 1500rpm or 2000rpm springs be better for hilly areas
+conceal It only matters if you're starting on a hill.. the first say 10MPH or so. Regardless, you need to try them and see if you really want the best performance. Not all clutches and springs act exactly the same and the way the rest of the CVT is setup will matter. There is no easy answer of X springs work best in all cases.
+90GTVert thank you
I don’t have a pick. What else can I use?
Maybe a little screwdriver or pretty much anything with enough strength that can be wedged in as shown. Or just get some picks. They have many uses and they're cheap.
amzn.to/3LwRw0m
Where to purchase springs
You can get springs for the 139QMB many places. ScooterTuning.Ca is good, PartsForScooters as well.
hey, I have a 49cc scooter and it's a 139 qmj . do you think these mods would work on it ?
Tan facil era!
because spark plugs have space
if you have any trouble taking the springs out, just cut them, you shouldn't re-use them anyway