blown motorized bike carnage!

[thunderhead289]

finally granaded off the motor. the rings look pretty bad as I am pretty sure they( with all the blowby) had something to do with it.

here is the video of the engine carnage, enjoy

https://www.youtube.com/watch?v=Rp7HWj0UN50

 

[cpuaid]

finally granaded off the motor. the rings look pretty bad as I am pretty sure they( with all the blowby) had something to do with it.

here is the video of the engine carnage, enjoy

https://www.youtube.com/watch?v=Rp7HWj0UN50

I have 3 blown HT engines that i never even bothered to disassemble and found the video very informative. 2 of mine blew less than 1000 miles, 1 at a little over 2000 miles. at least you were able to get 1800 miles out of yours. thanks for sharing.

 

[EastSideRider]

my piston keeps getting i've had the engine for a month maybe more been trouble shooting ever since doesn't have a mile on it what should i do PLEASE SOME ON HELP

 

[butterbean]

Your piston keeps getting what? Very hard to understand your post.

 

[darwin]

Do you think those 2 strokes grenade because of running them lean with oil in the mix? Landscaping cos abuse their 2 stroke stuff and they seem to go from year to year running till they wear out.

 

[thunderhead289]

they grenade because they are usually poorly balanced and are under a load much greater than most lawn 2 strokes.

these engines are just loose. when you think of the run time of the bikes under a load vs the lawn 2 strokes under a load, they are roughly the same. oil and air fuel ratio have little to do with it as long as they are adjusted marginally correct.

 

[butre]

Landscapers rarely hit 3000 rpm though, it's not unheard of for people to push 7 or 8 thousand RPM with a ported jug

 

[thunderhead289]

and the fact that we consistently run at 4 to 6 grand normally with minimal cooling fins compared to your average two stroke

 

[Fabian]

Do you think those 2 strokes grenade because of running them lean with oil in the mix?

My experience is that once you move away from 25:1, the life of a Chinese 2-stroke centre mounted bicycle engine decreases significantly when asking the engine to deliver continuous output at close to maximum usable power.

 

[Deleted member 12676]

for the benefit of all I hope that anyone who has had a blown engine will share all details such as
engine oil used
at what ratio
size engine
any modifications to engine (compression increase, porting, carburetor, exhaust pipe)