Re: [ST] Vibration & wrong tune

[Charlie McCullough <charliem90@xxxxxxxxxxxx>]

At 07:37 PM 8/15/02, Sean Baumann wrote:

>So, tell me about the balance shaft.  What could cause it to go out of 
>alignment?  I read somewhere that it is by jumping a tooth?  Is this a 
>tooth on the sprocket (front or rear)?  Well, my dealer did switch my 
>front sprocket out last month.  Could they have done something wrong to 
>cause a problem with the balance shaft?

I wouldn't worry about the balance shaft. The vibration that's been 
described in this thread doesn't sound anywhere serious/severe enough to be 
caused by mis-aligned balance shaft gear.

Generally.....when you get a balance shaft mis-aligned it's damn near 
physically impossible to hold on to the clip-ons the vibration is so 
intense/violent. Like trying to hold on to one of those small hand-held 
rotary sanders.

What is possible - and can cause vibration more like what's been described 
- - is a spun bearing. But even that is pretty unambiguous. None of this "I 
say it's not normal and my dealer says it is" kind of stuff.

I'd suspect a problem in the ignition/FI. Either a bad FI map or throttle 
body problem causing rough idle/low-end revs.

Charlie McCullough
tz250 WERA#90
Duc 748
Triumph ST


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