After talking to my friend who blueprints Harleys and drag races Busas for a living, these numbers are definitely unacceptable. That being said, Triple Jim good catch, I learned everything I know for Aircraft, so I forgot to hold the throttle open for my warm compression test, so that should help. Also, the leak down test was a bench test, meaning it was at cold before the new piston rings had been seated (freshly built, no startup) so my leakage numbers should half at warm now. I'm going to try again tomorrow and do a warm leak down test as well, then I'll give my numbers again.
Also Racer X, I know what you're saying, having seen similar numbers from cars and my 2008 Ninja 250 racebike at cold, so I was surprised when the book said 142-218. That's why I made this post in the first place.
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Racer, Mechanic, Enthusiast. Vendor for Norton Motorsports
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