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Reply to "Empi HMPX carbs"

Did you get the Weber tuning guide?

How have you determined it's 1 & 2?

Does the popping start when you let off the gas?

Is the popping back thru the carburetor? Check for exhaust leaks.

Are the air by-pass needles  closed?

Did you check for air leaks at all gaskets with spray carb cleaner? Spray anything that has an o-ring or gasket.

Proper tightening of the carb body screws does not mean trying to wring them off. Sequentially tighten the screws in a cross pattern, just snug and one more grunt.

All adjustment screws are lightly seated when screwed in. Not tite. There is no repairing a damaged carb body from over tightening the adjustment screws...as far as I know.

Idle jet blocking should not be a factor above 3,000 rpm.

Check the ignition timing.

Have you adjusted the valves?

Chasing the popping can be really annoying. The engine will run fine until you want to take it to a show. They never give any problems when you have no plans.

I'm one of those guys who wants to fix it NOW. Sometimes I find that if I just put it down for a few hours and then go back the problem gets resolved...what ever it is. Sometimes it doesn't.

Don't know what your abilities are, hopefully they trend toward mechanical. It's not rocket science, but can be tedious.

All things work together.

Careful, step by step will get it right.

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