Why you should NOT engine break on a 2 stroke dirt bike
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- Опубликовано: 16 сен 2024
- a in depth video on why engine breaking on most 2 stroke engines/ motorcycles could lead to catastrophic failure.
ENGINE BREAKING= using the compression of the motor to slow a vehicle down
Never thought about that before... Makes perfect sense
A properly jetted pilot/slow circuit will never cause this to happen due to the circumstances you've explained. Also most carbs have a cutaway section on the throttle slide valve helping to prevent this situation even more.
It still gets oil as the higher vacuum pulls more fuel from the pilot. Even though it’s a small jet. The compression doesn’t slow you down it’s the vacuum on the intake. Which is strong. All the vacuum will still pull SOME fuel instead of pulling from the main it pulls from the pilot. I run 40:1 with full synthetic for longevity of the engine. I engine brake all the time never an issue. But also rev match into the downshift and continue to rev match and downshift through the gears as I’m slowing down. Giving the engine an extra bit of fuel. Regardless it doesn’t matter. Your piston looks like you ran it lean. Causing you to burn all your lube up running dry. Also downshifting and rev matching is how you should ride it’s easier to stay in the right gear keeping the rpms just in the power band range so exiting the corner you’ll be in the right gear and back in power band once you open the throttle.
Never realized this until now thanks for the info appreciated
You explained this very well
I got a kx-250f I watch ur vids and I learn alot, thank
Thank you man I just build a bicycle Chopper with a small 2-stroke 49cc engine thanks for teaching me this it's my first time learning this
Thank you for this, I just blew a top end on a goped scooter and this is exactly what I was doing. Only person I’ve seen on RUclips that explained this as a problem.
It’s a fact 2 stroke pistons only get lubrication through the fuel so when you let off the throttle there’s no lubricants getting in
@@Nate87018so the engine dies? If the engine is running it’s getting fuel. If what you said was true… Rekluse Auto clutches would be destroying engines
You must be doing something wrong. Been riding/racing and rebuilding 2 wheelers fo 35 years and I never scuffed or blown up a piston. 🤔
Honestly I’ve been riding 2 strokes for a long time now and I engine break literally every time I ride and am yet to blow up my engine, I have a 80cc motorized bicycle and I engine brake more than I actually use the brakes, I also have a honda cr125 and keep in mind I’m a trail rider so I go up and down hills all day and engine brake, yes on paper this makes sense but in reality I’m willing to argue that engine braking is not bad for your engine, if what you are saying was actually how it was then you would be wide open on your dirtbike, as fast as you can go and when you let off your throttle the engine would lean out like crazy and start to idle super high, not only that but when you got back on the throttle I imagine it would still be lean for a second until it could get fuel back to the engine so it would be super zingy and maybe even bog, I understand your concept but the evidence just really isn’t there in my opinion at least.
Thanks man i fully agree.
Guys just pull your clutch in when u slow down
Uh my old kx didn’t engine break when you get off the gas it was like holding in the clutch. It free flowed. Seems like every 2 stroke I rode was like this so I’m super confused
they do engine brake just not very efficiently
On my yz250 if i was coming off full throttle id just pull the clutch in then back to full throttle never had a problem till around 180 hours i ran it cold and cracked the cylinder
Yeah if you run a higher fuel to oil mix like 32/1 is what I run and dont have that MANY problems but everyone i know runs 50/1 and have alot more wear on there engines
What does pulling in the clutch do exactly? I try to tell my friend that he needs to pull in the clutch when not giving throttle but he doesn’t believe me and I can’t explain why you need to do it.
@@WorksForMeBro you don't need to pull in the clutch when not on the throttle
Octane Addiction Then why does everyone on the internet say to do it then
@@WorksForMeBro I've never heard anyone say this but unless you aren't on the throttle for a long time you don't need to pull in the clutch. You have alot mo re control of the bike when the engine is engaged
what about bliping the throttle while pulling the clutch and letting off the throttle, the oil will stil lubricate piston right?
What do you mean by “modern 2 strokes”? I have an ‘82 Honda atc250r. Does that mean I can engine brake? I’ve never seized a 2 stroke by engine braking.
Never said you couldn't brake just said it's not to great for the engine
@@octaneaddiction1405 oh ok. Thanks
You're fine he needs to be educated just ride your 250 and have fun
@@donlef765 alrighty. Will do
I didn't understand why oil doesn't reach the engine when you let go the throttle when the oil inyection goes to the carburator. Doesn't the oil also go in terms of RPM, not only throttle?
This video threw a curveball at me...Started to watch this based on engine "breaking"...meant to title as "braking" SMH
That’s why you guys hear the boy on the MX o enduro o any old school 2 strokes bike doing those “baam braap brrrraaap!” whilst they are breaking before a turn or at the end of a straight line. 🙌🙌🙌🙌
Where did you get this information from if when you let off the throttle it stopped putting gas in your engine would stop running you are always going to have a constant flow of gas into the engine or else your bike would die.
Yes you have enough for an engine to run but not enough to lubricate a 2 stroke engine, please do some research before commenting
My dad has road is kx250 2 stoke for years and never knew about This and his bike is still in perfect shape. And still rides good. I’m about to get into dirt bikes and have no clue what this is or what to do. I’m not worried about it but it would still be good to know.
Just make sure you run good oil and good ratio of premix and you should be fine
Yes but about those engine ejected there is a cable splitter and your throttle cable so when you let off the throttle it slows down the oil a lot
Engine braking on a TPI bike will not damage the engine. It says so right in the manual. But I think a carbureted bike is different.
Bearings ? The only thing 2 stroke oils do is lubricate cylinder walls . Nothing elce
Your 2 stroke oil also lubricates your big end and small end rod bearings. Please do your research before mindlessly comment on my channel.
This wasn't cause by "engine breaking"
Sorry for late comment, so when I am riding my bike and when I pull the clutch in saying it in first gear and idol it likes to creep forward a little bit and then when I I am riding in like fourth gear and I hold the clutch to not engine break it does it a little bit but not fully what does this mean?
Probably your clutch is to tight or warn down, i don't really know my bike does the same thing sometimes
Octane Addiction ok, thanks sm
Robert Luongo probably just your clutch is a bit warn out, but no clutch is perfect. For example, put any bike on a stand, but it in first, clutch in and the wheel will start to rotate, faster when revved. But usually you could stop the wheel moving with your hand, cause the clutch is out and there’s not much friction when it’s out. But if it’s worn out it sometimes sticks when out, or if the cables too tight.
What’s a break?
It’s down shifting to slow down basically
I’m new to 2 strokes and recently got a kx 65 and I can prevent engine braking by just pressing the breaks sometimes
Don’t listen to anything he said go out n ride it
@trav3510 trav3510 your stupid if u think engine breaking hurts your bike lmao
@@asho225 It does hurt your bike, if the cylinder has no lubricant it will likely cause damage
@@Loganon2wheels but it does have lubrication that’s what a pilot circuit is. Enough oil to keep the engine from seizing even with throttle shut off
@@asho225 If you've got the bike pinned and engine break multiple times there will be no more lube left
bs. I did 4k km last year on a premix 2t road bike with lots of engine brake and piston and cylinder still look brand new
The old bikes are premix. Newer bikes are separate like the ktm 2 stroke oil goes in the frame.
yes it will run dry for like 4 seconds not anuf time without fuel to blow up
more concerned about stress on con rod snapping or rod goes up threw piston cous piston
is forcing it to slow down quicker equal more stress
ive always wanted to know what that metal bottle on a 2 stroke is, the one that has a red bull skin on it
Shock oil reservoir
Little NT Speed carb action. Nice lol
Ok so i have a quesion.I have a 2 stroke motorised bike and i engine break by pressing the killswitch and do wide open trottle.Fuel is still travelling inside when you do that type of engine break.
(The steps are=
1.press kill switch
2.wide open trottle
thats it oh and you stop faster when holding the trottle open while pressing killswitch *wich means engine breaking)
so can you engine break like that?
Yes this is fine, if your okay with more fuel usage. It will not harm your engine
Are u stupid?
i’m new to dirt bikes and especially 2 strokes. i have a kx80. it’s my first bike and i see all these things about how not to engine break but like how can you safely slow down without ruining the engine?
You can use the engine just give it a little throttle every few seconds and use the breaks when needed
Octane Addiction okay. i’ve heard some people say pulling in the clutch and then using breaks works too. it that true?
@@alexandermiller3157 yeah that works to
So is there a way to prevent engine breaking im new to dirt bikes and can't really find an explanation like if I'm slowing down and I slam on the brakes and the engine doesn't have enough time to slow down is that engine braking even tho I'm using the brake or am I suppose to hold in the clutch when slowing down or am I not supposed to hold down the clutch I need answers not sleep!
A little bit of engine braking will not hurt. but I suggest if your slowing down for a long time or coasting to blip the throttle or hold in the clutch. This is only with 2 stroke dirt bikes
@@octaneaddiction1405 okay so if I'm coasting I hold in the clutch or if I'm slamming on the brake I pull in the clutch?
Great info. Thanks!
Just go full throttle and hit the kill switch?
Are you all thick ?
I have a 07 kx100 is that considered modern
It does engine break if you not throttle because it doesnt get air(with fuel)
If i understood correctly pulling the clutch will lessen the engine rpm by disconnecting it from the wheels?
Correct.
Do i not engine break if i was on flat ground and want to shift down?
You can. Just don't do it for extended periods of time
@IHas that's on a 4 stroke small brain
@IHas i don't think I've seen a 250 two stroke nonetheless a two stroke that can engine brake
@IHas let em rephrase that I've never seen a yz250 two stroke nonetheless a two stroke you can engine brake on
@IHas but apparently a yz250 two stroke exists the more you know
When I want to slow down i Just down shift with like 15% throttle without clutch. Is that bad? I ride a ktm 150
literally no comment LMAO
No not at all. Dirt bike transmission are constant mesh transmission meaning you don’t have to clutch while shifting
But if your shifting down with out clutch that leads to engine breaking so you want to get on to the gas or just give it a little bit of gas and you’ll be perfectly A ok
@@canadianrider7618 thanks!
No problem man
I didn’t think it would be a huge deal because there is already oil in there
Letting off for 30 seconds shouldn’t cause to much harm
Not a problem if it's oil injected...
who purposely breaks there motor? I've had to engine brake but I'm yet to break my engine...
Just noobs, I didn’t know you shouldn’t do this on a 2 stroke until just recently but I’m fairly new to 2 strokes
fujiwara fan boi , that would be "their motor". You can't spell either.
So I can’t just let of the throttle to slow down I have to use breaks all the time
You can its just not great for your bike
@@octaneaddiction1405 what about if you pull in the clutch and just coast until you get back on the throttle ?
How do you engine brake
Usually it's not something you actually do it just happens. Like after you've revved the engine high and you are no longer giving it gas and are just coasting so to speak that's engine breaking. But I'f your actually trying to engine break you can give the bike full throttle while holding the kill switch
@@octaneaddiction1405 or like down shifting and just let the compression of the motor slow you down with no throttle
@@7ILLEVANS yes that's engine breaking
@@octaneaddiction1405 lol I was helping further explain... Accidentally tagged wrong person... I did ask your opinion on something in one of these threads tho
Octane Addiction yhh
K but get to the point, I didn't click on how a 2 stroke works
You honestly don't believe this nonsense with engine braking ? Most engine damage would be from stupid lead fuel / oil mixes and poor oil. Poorly jetted carb and a general lack of maintenance by not changing pistons and rings when you should. A leaky base gasket will melt pistons and seize motors too. From aircooled to watercooled race bikes , I've never had a issue from engine braking and yet i live in a hotter climate
I believe that this nonsense is true, the reason that it is so common is because all the new riders switch from 4 strokes to 2 strokes and don’t realise that when you come off of the throttle and the engine is at 5000rpm and it’s only getting 1000rpm of oil, that pretty much everything isn’t getting enough lubrication, resulting in the ring expanding and catching a port from all the heat, or the piston and ring melting and probably more
@@MikeHunt-bg8sh Never rebuilt a 2 stroke? Lubrication at no throttle isnt an issue, unless you plan on hooking up your bike to a car and dragging it a couple of miles in gear while off.
The oil coats the internal parts and is fine for the engine, when the throttle is off as the motor isnt doing any work therefore generating little heat and load. The oil/fuel being pulled from idle is absolutely fine for when your engine braking.
When you rebuild a 2 stroke there is plenty of oil coating everything to keep the motor lubricated even in instances where oil/fuel flow slows down
I agree. 2 strokes blow up either with low octane fuel, running pistons with 100 of hours on them, or just plain stupidity like putting no oil in fuel.
For it to be an issue you would pretty much have to tow the bikes for miles in gear at high speed. Even then I question whether anything would happen because 2 strokes don't become bone dry when shut off. There is always a thin coat of oil on all the parts from the last time the engine ran
@randy s maintenance is everything on any bike. They blow because people use the wong oils , wrong oil to fuel mixes and don't perform piston changes when they should. I'm yet to ever have a 2 strole blow up due to engine braking. Total myth. I have a IT490 with a YZ 490 barrel. To cool the motor after a long high speed run , i hit the kill switch or reach down for the chocke. No spark or excess fuel n oil cools the cylinder enough after a big run to prevent seizure. Been a very long time since I've done a full motor build on that !
@@mrdilligaf1968 old school technique. My pop always did the old "rev it wide open kill switch bog" as it coats everything in oil for storage.
The only other thing that'll blow up a motor is jetting unfortunately I was a victim of. Went down to Florida where it's humid and sandy. Of course the bike didn't feel as good. Changed needle, felt crispy . Went around the track getting to the heavy sand section and you know what happened, long push to the van.
good to know......fuck
32:1 all day
He is right I seized my 80cc 2stroke motor bicycle this way
I learned that😂😂😂😂
Still has oil of the idle
João Paulo Cordeiro but it’s nothing compared to getting full throttle amount of oil and then dropping back to idle which is like 1000 rpms or higher big difference man
Ya except your motor is still doing 5000 rpm with 1000 rmp Worth of lube as he was saying
@@nickjones3820 motor isn't under load with the throttle off, which generates more heat than just raw rpm.
It's like being in first gear high rpm up a hill is an easier load on the motor, than trying to have the motor pull to tall of a gear.
Rich Racing huh I didn’t understand what you just said
@@nickjones3820 engines are under the most stress when loaded. Coasting a two stroke with the throttle off is a condition in which the motor isn't working very hard and generating less heat. You don't need a lot of oil for that. There is still an oil film coating all the parts not to mention oil being pulled in from idle.
Unless you literally hook up your 2 stroke bike to a car and drag it behind your car in gear, oil lubrication isn't an issue in terms of engine braking in a two stroke.
Dude you are so wrong, you know nothing about 2t dirtbikes, a good example of someone needs to do alot more research on what he is talking about 💯👎👎👎👎👎
2:16 😂ahh thanks man.. I recently just started riding my 97 rm250 ruclips.net/video/03KTyKNh1_Y/видео.html