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Tonight I had the chance to play with a brand new z125 (4miles), my previous experience ( 2 other z125) both ran 13.10-13.30 45-46mph stock with me (210lbs), it ran a 12.93-13.10 47-48mph with my friend (180lbs) on them, tonight we took a bone stock bike, swap my old hi compression piston, cam, home ported head, bike ran a 12.48 with my friend and a 12.65 with me, took it back to the shop put a light primarily gear and my old performance clutch, drained the gas since we did not know the octane, filled it up with 93, made a few more hits and ended up going a best of [email protected] not bad gains for a stock intake, stock exhaust, Stock appearing bike with 20 miles on it now, I bet with a tune, exhaust, air box mod it would easily go mid to low 11’s well worth the 2 hours 16 miles worth of work
 
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