When is a 2-stroke supposed to 4-stroke?

C

CaliRebel

New Member
I've heard various comments on the board, but I'm unsure when it's a bad sign that it's 4-stroking. Near as I can tell the engine should only be 4-stroking when it's not under load, but some people seem to only get there bike to 2-stroke under full throttle.

When should these bike engines 2-stroke, and when shouldn't they 4-stroke?
 
Some people think they should 4 stroke when they are not under a load. I don't think they should ever 4 stroke and if any of mine do I fix it so they don't.
 
i agree. my bikes never 4 stroke. not uphills, not under load, not at WOT. if they do, something's wrong.
 
Generally 4 stroking indicates that that motor is running rich. My bike after tuning it with jets, better air filter, and opening the intake and exhaust flanges didnt 4 stroke at all.

I just got it tuned (2 weeks ago) and running the best it ever did and then at 20mph the motor siezed and locked up the rear tire, saved it though, thank god I wasn't going faster. Don't know what happened yet but will take the motor apart in a few days and find out.
 
I always wondered what exactly would happen when the motor goes. My hand will always be on the clutch lever now.
 
I have mine tuned to almost never 4-stroke. Only time it ever does is if I'm going down a hill at like 1/4 throttle or less. Any time it's under any load, however small, it runs great. Was just a simple re-jet.
 
ToxicAz520 said:
Generally 4 stroking indicates that that motor is running rich. My bike after tuning it with jets, better air filter, and opening the intake and exhaust flanges didnt 4 stroke at all.

I just got it tuned (2 weeks ago) and running the best it ever did and then at 20mph the motor siezed and locked up the rear tire, saved it though, thank god I wasn't going faster. Don't know what happened yet but will take the motor apart in a few days and find out.
Click to expand...

What size jet were you running?
 
currently mine only 4 strokes when it's still warming up or at idle. but i feel most of that may have to do with the expansion pipe.
 
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