piston free play - different way

[Emhyr]

Hi all on start i'm sorry for my english ;-)

 

I have some problem with my shee, it started to run only on right side piston (left pipe is cold after ride)

 

i dissasembled whole intake (airbox carbs reeds) , iv'e looked on pistons thru the intake ports and they look good any scratches/rings look good too - it's not an electrical issue (good blue spark) but something don't let me sleep - left piston got alot of free play (not forward-> backard) but left right 0_0 i can turn pisotn from intake side about 2-3 mm left and right - i know it's not good but could it avoid firing on that cylinder? 

 

compression i strong in my opinion but have much difference between cyls (left not firing 150psi, right running good has 170psi)

 

ps

 

it isn't a carb issue to because i run 2into1

 

Thanks for all ideas, i dont know what to do now - tearing it down (head.jugs) or look to find some other issue

[Larry's Shee]

I would pull that cylinder and look at it better. Either the pin bearing is shot or the big end (crank) bearing is shot.

[blowit]

No, radial movement of the LH piston should not cause what you are describing. 

 

I would recommend swapping the plug cab L ro R to be sure but if you are confident this is not electrical, that pretty much leaves carbs.  When you sense the L side pulling back, pull the choke and see if it comes back.  If it does, you know you need more fuel on the L.  Check carb balance (slides), and carb clean.  Usually the pilot jet is plugged. 

 

 

Brandon

Mull Engineering

[Emhyr]

No, radial movement of the LH piston should not cause what you are describing. 

 

I would recommend swapping the plug cab L ro R to be sure but if you are confident this is not electrical, that pretty much leaves carbs.  When you sense the L side pulling back, pull the choke and see if it comes back.  If it does, you know you need more fuel on the L.  Check carb balance (slides), and carb clean.  Usually the pilot jet is plugged. 

 

 

Brandon

Mull Engineering

Thanks for reply, problem solved, it has alot air leaks on intake iv'e fixed it, i've set proper gap on stator + new plugs and it runs like hell

 

now i need some other advice about size domes on my other bike here's a link http://bansheehq.com/forums/index.php?showtopic=165716

[sleeper06]

What about the compression difference ,that's big 20 lbs difference no good.