Re: backfiring and not much power
Backfiring and lack of power could also indicate a lean condition... which could result from carburation issues, or a vacuum leak around the intake...
start with fuel flow... if you have good fuel flow, check to see if it runs better with some choke... close the choke a bit and see if the backfiring stops. If the partially closed choke makes the backfiring stop, you are running lean...
If you are running lean, take a can of WD 40, or carb cleaner and being sure to use the straw that comes with it, run the engine and spray around where the intake manifold meets the head... spray from a variety of angles. Spray with small shots... if you suddenly hear a change in rpms you've found your vacuum leak. Also check where the carb mounts to the intake manifold using the same method. If you have the vacuum port for windshield wipers... check that too.
If you don't find any vacuum leaks you may have a plugged metering jet in your carb, or your float level may be too low.
Rob
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