G16 surging & backfireing

fishjd7

2000 G16 surges and intermittent backfire through the carb changed fuel filter and cleaned air filters. Problem occurred while kids riding so not sure what happened any help would be appreciated

BGW

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technoid

Loose carb or manifold? Fuel Mixture gone lean? Sticky or burnt intake valve? Those are just some of the symtoms of back fire in the intake.

fishjd7

thanks the carb is not loose how would i adjust the fuel mixture

smallblock450sl

Back fireing is useually caused by throttle shaft not completely closeing, useually adjustments on accelerator cables #1 or # 2. If the carb gaskets are damaged, could cause that. I have seen if the airbox to carb nuts are loose, can give that symptom. Let us know what you find.

technoid

The main jet is not adjustable. But the idle mixture is. You could try setting the idle mix but I don't think thats the problem. Backfire in the intake is from an air leak getting into the manafold. Thus a Lean mixture. Look for cracks or a bad gasket. Check compression. A Bad intake valve will cause it to. What you describe is typical of a vacuume leak. A good method to check for bad valves or leaks is to apply air into the spark plug hole with the piston at Compression TDC. I made a fitting out of an old spark plug and brazed an air hose connector to it. I use a paint regulator to reduce the air pressure. If there are any air leaks you will find them.

fishjd7

thanks i will work on a vacuum leak today let you know what i find

homercross

I had the same problem. It turned to be a crack in the muffler. It messed with the back preasure. Does it sound different? If so that is it.

technoid

Good point! Loss of back pressure will also cause a lean mixture and over heated valves.