running rough


Old 07-21-10, 05:16 AM
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Join Date: Jul 2010
Location: usa
Posts: 1
running rough

I have a Craftsman rider model 917.272460 with the 21.5 hp two cylinder ohv engine. When purchased used one year ago it ran ok. I changed oil, filters, plugs, and fuel filter. Now the engine revs by itself, or at least sounds like the revs go up and down. It also backfires every now and then. At idle it sounds ok but when the deck is engaged or you put it in gear the trouble starts.
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Old 07-21-10, 07:16 AM
indypower1's Avatar
Join Date: May 2009
Location: Lake Winnipesaukee, New Hampshire
Posts: 634
have you adjusted the valves?

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