Yamaha G1 2 stroke, won't run with air filter on.

[P-Z-GO]

Ok, I'm sure I'll figure this out, but in the meantime, I figure I'll post it and see if any of you guys have eve had this happen. Cart will not run with any type of filter on the carb. I tried the factory one, even took it off and sucked through it to see if it was clogged, and it's as free flowing as they come. Next, I took a brand new motorcycle air filter, and rigged it on the carb, still, no bueno! With no filter on, it runs like a champ, but it runs best with the mixture screw about 1/2 turn out. New fuel filter, all lines good, carb has been cleaned. Any ideas? I did notice that the float needle does not have a clip that holds it on to the float. Not sure if this is normal for these carts or not. BTW, I just got this cart a couple days ago, and it's been sitting for a few years at least. Compression is 135! Thanks


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[tew45]

Check the main jet!

[Dflowe]

You must have a clog in your carburetor somewhere. As tew45 says above, I would start with the main jet and be sure it's absolutely clear. However, I would also check the pilot jet to be sure it's not clogged either. As you clean the jets, be gentle with them as you don't want to enlarge the holes.

[1989Marathon]

Check for a crack in the rubber carb flange.