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Old March 17th, 2020, 03:03 PM   #41
daverdfw
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Name: David
Location: Fort Worth,TX
Join Date: Nov 2015

Motorcycle(s): 2009 Ninja 250

Posts: 386
Quote:
Originally Posted by DannoXYZ View Post
Compression is perfectly fine. Bleed-valve is way up by gauge, entire volume of hose is considered part of combustion-chamber. Reading of 145psi is perfectly fine.

My race 250 bike has 5 hard seasons on it now. Two by previous owner and 3 by me. It got 145psi when I picked it up. Did 40-48 days at track each year. About 10-14 of those are races, which are actually easier on bike due to less time on track. Rest are full trackdays, 2.5-3hrs at WOT. After last season, I did tune-up for this year and tested compression. Exact same 145psi.

You'll find after re-ringing engine, readings will be pretty much close to same. Perhaps even lower before it's broken in.
I think I am going to just get it back together and ride it and go from there. If I decide to keep it and replace my other track bike I can always do rings later if I feel its down on power.
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