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We do multiple compression test with 2 sets of gauges and average the numbers because we can never get them to seal 100% of the time. I find the compression gauges so frustrating, but I get results with a little patience. Now when we do bbk kits on 2 stroke Zuma's the stock starter does not have enough torque to turn the motor over anymore. We just kickstart them. I know they make high-torque starters for GY6 4 stroke motors. Last thing to check is cold cranking amps on the battery. You said you got a new one, but is it enough to turn over the now-larger motor? I honestly know very little about GY6 motors. My friend and I have built a bbk Genuine Buddy but its been awhile since I messed with one.
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