How to increase flow 250% ‼️ CARB TUNING velocity port tuning Predator 212 Honda gx200, 390, 420
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- Опубликовано: 11 окт 2024
- Inertia ramming,Computer simulations, flow testing, dyno test, velocity stack, carburetor tuning, fuel/jetting,increase horse power and torque
It would be nice that you have some engines running or an action that will really get people going and motivated to want to get your products I will get a whole lot of products from you in the near future so I can smoke the competition and have Flawless victory
I respect , not leaving anything one the floor. 3 years ago. Awesome 👊👍
What I have been reading is even though the throttle is opened up full and the engine is revving a lot faster, the time between each cycle is a drastically shortened. So it is actually not as big of increase as one would think. Think of it as faster sips but not as big of sips.
Great video btw.
Incredible Set up. Wicked machine. Great Job !!!!!!
Thank you
Great info, I got that cdi ignition system finished and you can change base timing with out removing the flywheel and there is 20° of pre set advance set by rpm. Testing last few days and always needing more air flow so thanks for the info.
When you get it 100% sorted out and in a nice package to be installed send me one. Maybe there is money to be made. Just make it sleek and simple to install. Looks are everything in business. The concept is sound and would most likely have interest. Let’s get something going
@@paulskartslifan4206 do you a contact I could send you some videos. I am out in the city today picking up a lift and need a tube with a 90° like you had there. Its basically done and is just direct bolt on. Hit me up and let's get it. I am just waiting on connector ends from China so i can make a few wiring harnesses and I also have to wright up an install check list ext....
People in the Facebook groups want to buy it already it looks like a ready to go product.
@@cdiperformanceparts4364 contact me thru the site paulskarts.com
@@cdiperformanceparts4364 go to contact us .. send me your email and we can talk
Please read and chime in, need some help on this one,
This makes a lot of sense as I am having what I believe to be a low velocity issue in my carburetor at about 3600-3800 rpm, when moving on the kart, not so noticeable on the bench but still there
I have adjusted and adjusted some more on the carb, richer leaner and everywhere in between, was getting ready to change out the cam thinking it was too much duration, but the way it runs when its on was so great, need help!!
It just seems as if it is running rich and firing on every other power stroke, and the tach reading bounces around, if I nurse the throttle I can get past it and it takes off like a raped ape, but I would obviously rather have a smooth power delivery.
The engine is on a heavy industrial kart, 2 seater from an amusement park, it is a panther plus built by amusement products, it has a 2:1 wet clutch reduction box, and a Pfieffer engineering, cog belt drive pulley set, 27:80 teeth, with a final drive is 5.93:1
Achieved 7200 rpm 46MPH weighing over 500 lbs!
I need you to weld up a head for me, and I need that stack along with the elbow. Are you still running specials on NEW head welding?
Here are my Honda GX 270 UT1 engine mods:
Bottom end:
NR flat top piston
ARC billet con rod
ARC billet flywheel
stock honda head, not cut (lightly ported)
stock head gasket
Valve train:
dyno cams 275 grind cam
NR 1.3 ratio billet roller tip rockers
NR chromoly pushrods with billet guide plate
Stock sized stainless steel valves
NR dual springs 65lbs
NR billet retainers, with split keepers
Carburetor, Ignition, miscellaneous:
Mikuni TM28 with a 170 main (tried 150 up to 280, losing my mind) pilot jet 17.5
NR manifold (port matched with a lot of cleaning and a small amout of quicksteel to avoid changing cross section of intake tract and fuel drop out)
Stock magneto single wire UT1 I believe (Hope it wasn't a rev limiter this whole time, as it always happens 3600 - 3800 rpm) saw your coil video nice work!
Exhaust:
NR header smoothed at flange, port matched
450cc dirt bike muffler, large, quiets it well, no restriction, straight through.
HELP!!
Well .. sounds like I can get you the help you need. Check out the website paulskarts.com the head you want is on there and I’d recommend just trying one of my carbs. Will know for sure if it’s the problem with that. And thank you for the kind words 🌹🌹🌹
Also if you want just certain items done to a head you already have look under category shop services. Then follow mailing instructions.
I have a 390 engine , with some dust on her . What should i do on a budget ?. No one runs big blocks . I wanted to build the engine, than the bike .
Now your gonna have to convert a go kart into a portable flow bench to get some flow figures in dynamic setting 😂
Another thing, all these pod filters, (like the K&N) ppl just stick on the carb, why doesn't anyone make like a velocity stack, with a filter on it, say a 20mm carb, with 38mm inlet, putting a filter with a 20-25mm inlet on it, it's really going to screw up the flow into the carb, I'm running a foam pod filter, on my 38mm carb inlet,( 20mm carb ) the filter has about a 36-37mm outlet, it is basically the same size all the way in to the filter, I made another that where it slides on the carb is the smallest part, where the air flows from the filter to the boot is actually larger, around 44mm, so it's kinda like having a velocity stack on the filter, going from 38mm to 44mm or so, then larger to about 70-80mm diameter filter, about 70-80mm tall, cone shaped, to about 50mm at the tip, I don't see why they aren't made like this? Seems it would be better to use a much larger filter with a reducer, to prevent the crazy flow into the carb!
Hey Paul I need your advice on something, I have a tillotson 212 hemi right now and the modifications i have are:
- removed governor
- billet stock length rod
- ARC 6621 billet pvl flywheel
- briggs 12,000 pvl coil
- 22mm mikuni
- AR3910X plug
- red stripe 10.8lb springs
- valve springs shimmed 0.050"
My question is will I be able to benefit from upgrading to a 24mm mikuni flat slide? Or would that be too much carb for my motor? Or do you have a different carb recommendation? Keep in mind I'm on stock cam, looking forward to your response man I hear you talk about how important flow is to make power that is why my build is not cam focused, still making good power pulling to 6300ish rpm, thanks in advance man always appreciate your input :)
You really need to upgrade the head and start there .. don’t build from the outside in .. best advise
@@paulskartslifan4206 ya I realize doing the head will be a big upgrade and eventually I want to go that route, however for the time being do you think theres any horsepower to make from upgrading to the 24mm flat slide?
To be honest im kind of experimenting right now it's my first build I've ever done and so far my setup has been dyno tuned in the current state it's in, I want to see how far I can push a stock tillotson hemi head so I know from experience at what point you reach the threshold where the head has to be upgraded because there is no more power to be made, that's why in wondering about whether going for the 24mm flatslide would make some more power on the stock head instead of the 22 do you think it's worth it for the meantime before I get some $$$ together? I can get one for relatively cheap right now about $50
If you think the 24mm is a better choice than the 22 even on a stock head then I will go with it and then do the head once I get some serious $ together, just looking for a bit extra power in the meantime
I put a 4" velocity stack on a 12" long 1.5" I.d. hose, on a 20mm carb , hoping it would help, it's on a 80cc scooter, but it leaned it out so far it wouldn't run. Much over idle!
Goes to show how effective it is. Re jet the carb and enjoy your new found HP !
Have you tried boost bottles? Do they work?
hi paul what i run a honda gx200 with a .600 restrictor plate do you have an idea to optimize the carb jetting
Nope , lol .. I’m on the other spectrum of open modified. But carbs just merged fuel. If you could get it on a dyno that would be best. A AFR meter would also get you dialed in
I got myself a velocity stack after seeing this, it has a seat at the base of the stack designed to allow an air filter to be strapped over onto it, but the base is larger in diameter then the widest end of the velocity stack, therefore there would be internal air volume around the stack itself with an elbow attached to the base of the stack, will that affect air flow badly? If so should I just strap an elbow around the widest part of the stack itself, and then a filter to the elbow? (Same set up you have in this vid)
Also, what kind of Suzuki motor is that? Looks wicked bro
I’m having a hard time figuring out what the velocity stack looks like your describing .. if it looks like mine .. mine has no filter area inside of the stack .. so I’m confused a little .. as far as the elbow .. put it onto the end of the stack ..yes
@@paulskartslifan4206 it's ok man I actually managed to figure out a solution to get an elbow to seal around the opening of the stack like yours, but like I said what kind of motor is that? Specs n all, looks sick as hell after seeing your vid I ordered some fluorescent yellow fuel line myself lol
What do you mean specs ? What you Wanna know ?
@@paulskartslifan4206 displacement, current red line, horsepower, and torque, and is it really a Suzuki motor!? Cuz i didnt know they made small 4 stroke singles I thought honda was the go to, this is mad sick lol, also do you think you could post a vid (or direct me to one you already posted) about the whole process of actually tuning an engine to achieve the 5th cycle? Because I've never fully built an engine like this myself yet and dont like doing sloppy work so if I attempt it then it has to be done properly if you know what I mean, but cant really find anyone else talking about the 5th cycle or how to achieve it on RUclips, and I believe what you're saying man so like I said if u could post a vid explaining how to achieve it that would be mint
Go under my playlist .. go to playlist engine optimization...you’ll find all the videos your looking for in there .. let me know if you can’t find it
HI Paul, I recently bought Mikuni TM 32mm and trying to use it in combination with GX270+gx390 head but i just cant get it running properly probably due to the jet sizes. Can you please help me and give at least some advice on what jet size I can Start with ? THX
You need to get another carb. You will never get it lean enough. 100% guarantee it’s stupid rich. Am I wrong ? Paul
@@paulskartslifan4206 Yes you are right, its too rich. Now. I was trying to find something to match gx390 head port.
@@mustraperformance9103 it’s pretty easy, just get a burr and a grinder. We do offer port matching on the site under shop services category but it’s a cheap service you can probably do it yourself easily with the right tools
So how much does the air filter effect that percentage? Especially with a capped top air filter sitting in the main stream?
Refresh me on what percentage your speaking of.
Sorry so late. But the 250% is what I was referring to.
Any experience running Mikuni 24mm Flatslides
on modified GX-200 engines
I just ordered a 22mm roundslide Mikuni kit.
Wondering if i made the wrong decision ?
The right or wrong decision for you is based on what ?
@@paulskartslifan4206 Honestly
I love Flatslides
Well that makes two of us ..
Hi paul !
Your video's are amazing
as usual !
Do you have a used or new 24m.m. .Mikuni Flat slide carb. that I could buy ?
To go with your ported head
Thanx
P.S.
I never took that
Go Power Sports (Jap.) 22mm Mikuni kit out of the box .
Why do you say that? any resolution?
I have a flat slide issue as well
see my comment
Please read and chime in, need some help on this one,
This makes a lot of sense as I am having what I believe to be a low velocity issue in my carburetor at about 3600-3800 rpm, when moving on the kart, not so noticeable on the bench but still there
I have adjusted and adjusted some more on the carb, richer leaner and everywhere in between, was getting ready to change out the cam thinking it was too much duration, but the way it runs when its on was so great, need help!!
It just seems as if it is running rich and firing on every other power stroke, and the tach reading bounces around, if I nurse the throttle I can get past it and it takes off like a raped ape, but I would obviously rather have a smooth power delivery.
The engine is on a heavy industrial kart, 2 seater from an amusement park, it is a panther plus built by amusement products, it has a 2:1 wet clutch reduction box, and a Pfieffer engineering, cog belt drive pulley set, 27:80 teeth, with a final drive is 5.93:1
Achieved 7200 rpm 46MPH weighing over 500 lbs!
I need you to weld up a head for me, and I need that stack along with the elbow. Are you still running specials on NEW head welding?
Here are my Honda GX 270 UT1 engine mods:
Bottom end:
NR flat top piston
ARC billet con rod
ARC billet flywheel
stock honda head, not cut (lightly ported)
stock head gasket
Valve train:
dyno cams 275 grind cam
NR 1.3 ratio billet roller tip rockers
NR chromoly pushrods with billet guide plate
Stock sized stainless steel valves
NR dual springs 65lbs
NR billet retainers, with split keepers
Carburetor, Ignition, miscellaneous:
Mikuni TM28 with a 170 main (tried 150 up to 280, losing my mind) pilot jet 17.5
NR manifold (port matched with a lot of cleaning and a small amout of quicksteel to avoid changing cross section of intake tract and fuel drop out)
Stock magneto single wire UT1 I believe (Hope it wasn't a rev limiter this whole time, as it always happens 3600 - 3800 rpm) saw your coil video nice work!
Exhaust:
NR header smoothed at flange, port matched
450cc dirt bike muffler, large, quiets it well, no restriction, straight through.
I think I like the engine in the kitchen, handy to grab a sandwich.
Those were the good old days … toolbox in the kitchen too. 🤣
Funny!
A real knee slapper !!!
You still have any of these
Text me
Why all motorcycles have carbs in back of motor, exhaust in front, shouldn't it be opposite??????
That’s a real good question bud ... if you find out , I wanna know !!!
Exhaust in front to help reduce heat.
Carb in back to avoid from mud or water splash.
yamaha YZ250F/450F and BMW GS310 does the opposite
Intake in front, exhaust at the back
Header heat dissipation, and available space combined with feasibility, weight savings, cost, all associated with today's motorcycle frame designs.
is that a Tillitson Flat slide carb
It’s a mikuni tm 36