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ninjette.org certified postwhore
Name: Roger
Location: Mitchell, South Dakota
Join Date: Apr 2014
Motorcycle(s): 1978 Z1R, 1999 EX250
Posts: A lot.
MOTY - 2018, MOTM - Oct '16
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You are holding the throttle wide open while compression testing I assume. Even with the throttle blades wide open the slides are still closed and it takes 10 or 15 seconds of cranking to get a good reading. If the reading is really that low, I'd guess the lap job isn't holding or cams are not timed correctly. Try holding the cylinders at TDC and blow compressed air into the cylinders through the sparkplug hole (leak down test) and hear were the air is escaping, into the crankcase (past rings) or the exhaust (past ex. valve)or the intake (past int. valve). If you are getting spark the ignition box is working.
PS: welcome to the site!
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