My 440 is knocking when i give it lots of gas going up hill


is this a timing issue that can be corrected by adjusting my well timing or is my carb not tuned correctly

i do have possible symptom
when i start the engine cold i hear a pop coming from my exhaust kind of like a backfire... goes away after the start up.

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thanks as always

 

If it sounds like your engine is full of marbles it pre-ignition cause by either low octain fuel or to much advance.

 

auerdoan -

Pretty much sounds like a timing issue, like Don said, probably too much advance.

Archer