Yamaha G-5

[whizzy62]

I have a g-9 that is backfiring. I have taken the carb off and thoroughly cleaned it. I can adjust the high speed screw in or out and it doesn't help at all. The key is not sheared on the flywheel so I don't know what to do next. Maybe the timing is off ? Please help Anyone know where I can download a service manual for this cart ? Well, I adjusted the valve clearance to .004 and the backfiring is not as bad but it is still doing it. I could really use some help from anyone. Tks in advance

[jcg9]

Backfiring normaly means 2 much gas, check air filter. Just a guess?