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backfiring lawn mower?

i have a dolmar pm 4650 hs fitted with a honda gcv135 (4.5) engine
it has started back fireing and cuts out after 2/3mins
it restarts no bother and the whole process starts again .what could be the cause of this
kenny c, September 2009
I had this problem 2 days ago and looked online and tried the following suggestions.
I put dry gas in the tank
Changed the plug
Cleaned the filthy air cleaner and sprayed the carb with intake manifold cleaner bought at a local auto parts store.

Wow, I cant believe it, runs like new, good luck

T, November 2009
Fit a new spark plug!

John, September 2009
link Click here to see other fixes for Dolmar PM 4650 HS.