Question about Craftsman 20 hp 42 in. Deck Yard Tractor

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Have a 20 HP twin cylinder briggs engine on Yard Machine mower.

I was just mowing along and it started losing power and popping. I shut it off for a few minutes to let it cool off and it will restart with no problems, it's still not running right and making an occassional popping sound. I have since installed new spark plugs,still same problem. Sometimes it seems as if it is running on one cylinder. My next thinking is that it is probably the ignition coil. Was wondering if anyone else has had this problem ? Any ideas/help will be greatly appreciated because the grass here in KY is growing so fast with all this rain, you can almost hear it growing, Thanks in advance

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Sounds like it might be the air breather filter, remove it and see if it works

Posted on May 16, 2009

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You can purchase an ignition tester, the kind with the light inside it and check each cylinder at the spark plug to see if the coils are both firing steady. Look at your plugs and if one is nice and clean looking and the other is black and sooty or wet that will be the bad cylinder.

Don't know for sure but this may be something to look at. Remove your valve covers and check your valve clearances at 10 degrees past TDC compression stroke on each cylinder. They should all be .004 to .006. If you have one that is really far out of adjustment, it will most likely be an exhaust valve seat has popped loose in the head. Pull that head and look at it. If they are all pretty close to being set correctly, you may need to do a valve job on both heads due to excessive carbon build up

Posted on Sep 21, 2009

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I have the same problem. Worked on in several times and have figured out it is definately misfiring on the right side cylinder. The sprak plug on that side has a darker color than normal, replaced with new one several times - problem still exists. Thought it was a valve problem, possibly exhaust valve. Got a feeler gauge and both cylinders are good and measured the same - got spec from briggs book. I then thought it was a coil prob, got a new coil - still have prob. Mower shop said to check the carb. I removed it, tore it apart, didn't notice anything, but cleaned it thouroghly, reassembled - still have same prob. My thoughts keep goin back to valve prob, so I got a compression gauge. Removed plugs and fuel, attached gauge, turned the starter several times per instructions - got about 60 psi on both cylinders. So now I'm frustrated, not sure what to check next. HELP!

Posted on Sep 16, 2009

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