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If the factory shipped my bike with the valves within spec, and if the service records from the previous owner were correct, the first time my valves were touched was when I shimmed them this past August. I'd put all but the first 4100 miles on the bike. When I checked the valves, the bike had approx 22,000 miles showing. All the valves were on the loose side of the spec. Here's what I found when I checked them:
EXH .33 .31 .31 .31
INT .25 .26 .25 .20
I did the 'math', pulled the cams, purchased shims, and reshimmed to bring the clearances within spec. In my case, the engine ran more quietly (makes sense) since the valve clearances were tighter after I brought them within spec.
I would have to say that mine loosened over 22,000 miles instead of tightening up.
Bob
Note - I did not run the bike to 22000 miles without checking the valves. They were checked shortly after I purchased the bike (used), and again at 12,000 miles.
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2003 T100 (790cc) Lucifer Org and Silv: 122/42 jets, TORs, 17T, UNI filter, no AI, Polaris bellmouth, Metzeler ME880 tires, Progressive 440 shocks (105/150 springs),11-1126 fork springs, gaiters, MotoTwin low bars, 6024 lamp, htd grips, 12v outlet.
Last edited by ohiorider : 02-18-2008 at 09:05 PM.
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