KR-1S.co.uk Forum

hi there!!!




my bike has its engine recently rebuilt,and it works "fine"
but when i increase rpms the entire bike iniciates to vibrate,everything on the bike vibrates,and everything beggins to sound ,but when its in idle speed it doesnt vibrate.

do your bikes have the same"problem" or mine has something bad??


hope you can help me...
[-o<

forgot to tell you


ill post a video as soon as i get one

if your crankshaft has been removed...
might need to check the Balance Shaft (bolted onto front of cases behind left exhaust header)

there is alignment marks/punch marks - the gears have to be aligned to the center gear on the crankshaft

http://www.kr-1s.co.uk/manual/Part%2008 ... ission.pdf

Blancer Shaft Installation
Align the punch marks on the balancer gear and crankshaft gear.

[ see page 12 (page 8-12 of manual Crankshaft/Transmission) ]

maybe you dont have one - previous owner removed??
if there wasnt one it is probably not bad because the first TZR doesnt have one(?)
BUT if the balancer is out of phase with the crank that may be your issue - worse than not having one

i am sure its aligned,because i personally rebuilt this engine


buuuuuuuuuuuuuuut...


don you think my crank needs to be balanced????


because is the only thing i have left as a choice to solve this problem



thanks again

You won't have to balance the crank as such, but pressed cranks can twist out of alignment - haven't seen it mentioned on here though, so hopefully not a KR issue.

Could be one cylinder that's not running correctly at higher speed ?? I'd do the usual easy things first - plugs, clean the carbs etc. Are your reeds in good condition, and closing properly ? After that, worth double checking the balance position.

Good luck.

ok thank you everyone

please if you have any other idea please let me know,so that i will check the easiest


thanks again

even when one cylinder is not working at all, that wouldn't produce vibrations.

I'de check the balancer shaft first I had it one tooth wrong one time, and you can't believe how much vibrations that creates.

Loose engine mounting bolts? You mentioned it had been rebuilt.