150cc Turns over but wont start! HELP

[Darkshadowman72]

Hello all!

So today I tried to start my scooter and couldn't get it to turn over, so I adjusted the valve lashes. (IN".004" EX".003") It started right up. I took it out to town about 2 miles and shut it off and couldn't get it to start back! Run the battery dead. So I had to get it boosted of with my buddy's car. Well I couldn't get it to start without manually chocking it with my hand. (Covered the back of the carb till gas poured out) Cranked on it with about 1/4 throttle and if fired up. I tried it 2 more times and it worked both times, got it home and now it wont start at all even doing the Manuel choking. I checked for spark it was bright blue. Replaced the spark plug, cleaned the carb, and found out it didnt help so I replaced the carb. Sill no luck. Charged the battery up while I adjusted checked the valve lashed again. Still the same tried it but no luck. Its so close to running. Any ideas? Thank you!

[Kachi]

I got one, before adjusting your valves you need to make sure that you are in correct timing. Also I not sure if it is just a typo but the intake and exhaust numbers are backwards. Try .003(intake) and .004(exhaust).

[Darkshadowman72]

Oh! Thank you for replying... This was a few months ago. I fixed it. Ended up taking the motor off, and having a look internally. Turns out compression loss. Replaced the Piston, Rings, and Jug. And it fired right up. Never had another problem out of it. Thing was when I bought it the Piston, Ring, and Jug was shot because it smoked a lot, but still run. Anyways I replaced the Piston, Rings, and Jug. It still manged to start smoking again! I always keep my scooters full of oil even change it at about 500 - 800 miles. That one still has me wrapped up!

[kz1000st]

Just in case anyone is still reading this the correct valve clearances for a 150cc GY6 is .004 inch on the intake, .005 inch on the exhaust.