t3racing wrote:a 9hp loss due to wear and tear is a bit excessive. My TZ250 even with worn rings only lost possibly 3bhp and that was pushing out approx 75bhp.

The level of power is irrelevent, you ever swap a fresh top end for a 15 y/o one that you then did 1/2 dozen track days and 20 races on?
The bike made 62 bhp 2 years ago, then made 53 on the same dyno recently.

There's nothing "wrong" with it (if you don't mind struggling to pass flyweight 13 y/o's on 125's), it's done a track day and 5 race days since then, but it is worn out and jetted rather safely.
Andy guessed at 10 bhp down, he wasn't too far off.
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