Just spent a friend rebuild his top end. .5 over bored cylinder, new piston rings, new valves and seals. We thought his previous running problem was related to a warped head and we couldn't get the intake valve to lap. Used head problem solved with lapping. Today we got it all back together, Ran the same, Cleaned the carb twice, noticed the needle was really dull, replaced that. Still no good. No power over 45 mph. 5th gear is useless. Mine has a 118 main, big gun, 2 shims and snorkel removed. It will literally smoke his bike. Any one think cdi may be causing this? Sorry, it is an 88 we believe. Checked gas cap vent, no exhaust leaks, no carb boot leaks, New petcock. I am lost.
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