Re: [ST] Tire cupping/engine buzz

[Colt45 <colt4530@xxxxxxxxxxx>]

All that pretty well convicts the engine.  I believe you said it had 
been rebuilt.  Ride another triple and see if it is the same.  If not, 
you need to have the balance shaft timing checked.  My RS is among the 
smoothest engines I've ever had.  It vibrates, but I'll say I never 
remembered any until you started this thread and I began to pay attention. 

David Pullen wrote:

>>>The tread blocks will show an uneven, stepped pattern to the following
>>>      
>>>
>portion, with the leading edge considerably higher in badly cupped
>examples.<<
>
>Ok, I can see that my front tire is a little cupped, though not bad.
>
>I tried a few tests on my ride to/from work today to see if I could isolate
>the problem.  Riding at a speed where I was feeling the buzz, I let off the
>throttle and disengaged the clutch.  The buzz went away.  Re-engage the
>clutch and roll on the throttle, the buzz is back.  This seems to indicate
>that it isn't the tires.
>
>Then, at speed again, I disengaged the clutch, but kept on the throttle,
>trying to keep a steady 4k RPM.  Major buzz, worse than with the clutch
>engaged.  And the buzz gets worse with higher RPMs.
>
>This seems to exonerate the chain, and implicate just the engine.  The
>transmission seems to do a fair job of dampening the buzz.
>
>Does my logic add up?  Anyone else try the revving thing and see if there is
>a non-trivial buzz?
>
>Thanks,
>  - Dave
>
>
>
>
>  
>

- -- 
John Albright
'02 RS
Chattanooga
C-RATs


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