Question about 1987 Yamaha SDR

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Yamaha Bravo snowmobile keeps blowing exhaust springs

I have a relatively new Bravo snowmobile with less than 500km on it. To date it has blown 2 sets of exhaust springs. (springs that hold the exhaust to the cylinder head) Just recently the the weld around the exhaust ring that fits over the cylinder head broke off leaving me stranded. Unfortunately the machine is no longer on warrenty and the Yamaha mechanic I talked to has never heard of this and has no idea what is causing the problem.
I can't rely on this machine until I solve this problem.

Andy ideas?

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Sounds like the stock exhaust is the fault.  Possibly the shape is out of line and putting extra stress in the springs.  Any chance you can get another stock or even a after market exhaust to try for a while to see if it still blows the springs(I assume you mean the springs are breaking) in the past time frame? 

Posted on Jan 07, 2009


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