Athena 70cc kit and PHGB 19.5 idling issues

Mason Campbell /
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Hey guys, so I’ve got a problem. Athena 70cc kit with PHGB 19.5 carb. And a stock pipe. (Owner likes the stock pipe)...

Main jet is at 82 idle and choke jet are 55 and 55. Mixture screw is about a half turn out and idle screw about a half turn from full tight.

Bike runs at 1/3 throttle when the main jet starts kicking in. But in the low RPM range she literally will not idle no matter what we do. We’ve adjusted the needle setting from full rich to full lean. I have new idling screws of a smaller size coming in tomorrow. We ran a spray test and there are no evident leaks. We cannot figure this out and it’s the most frustrating thing I’ve dealt with in quite some time.

I’d appreciate anything you have to input.

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