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Craftsman lawn tractor 917.271060w/kohler 15.5 hp engine cranks but backfires thru carb and wont start.

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My 15 hp kohler engine backfired while i was using it, now it wont crank and backfires thru carb

Posted on Jul 14, 2011

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VALVE LASH NEEDS ADJUSTED AND CHECK ROCKER ARM BOLTS FOR TIGHTNESS. CONSULT KOHLER FOR PROPER TORQUE ON BOLT AND VALVE CLEARANCE BEFORE CRANKING UP ENGINE.

Posted on Oct 13, 2012

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15.5 hp engine stops running and now will not start. when trying to start the engine it back fires through the carb.

Posted on Dec 23, 2010

  • inorwood Feb 28, 2011

    I have just found the exact same problem with mine. I found the stud for the inlet valve had vibrated loose and reduced the inlet vale opening to basically zero.
    Adjust to specs and it will run sweet.

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1 Answer

When I try to crank my kohler cv15s it back fires


The timing is controlled by the key in the top of the crankshaft locating the flywheel. If this is sheared the engine will either run rough, backfire, pop or not run depending on how badly the timing is out.

Jan 26, 2012 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

Engine will crank but backfires thru carburator engine has been rebuilt


The key sheared on flywheel. Remove shroud and unscrew nut, then check for bad key.
Next, valves not closing right.
Next, carb. fuel mixture to rich.

Nov 27, 2011 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

2 Answers

Kohler engine backfires but does not run


sheer pin on engine shaft is busted. take off the fly wheel and look inside or on the shaft.

Sep 04, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

I have A craftsman riding mower 18 1/2 hp 42 inch deck have changed spark plugfuel filter took off tank and blowed it out but the mower still cute off after about 10 minutes like it has no gas what else...


Do you have a Briggs or kohler engine.I am having the same problem.I have changed the fuel filte, fuel pump, and cleaned the carb.Sears has been no help at all.The reason I ask about the engine you have is that people are having the same problem no matter what engine they have.So therefore it probably is not the engine so it is something else on the mower.My mower runs fine for about 10-15 then starts to stutter and backfire.I am continuing to pursue this problem and I will post back here if I come up with anything.

Jul 06, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

Tractor wont start


For a small gas engine than won't start, think FAST -- Fuel, Air, Spark, Timing. You've replaced the filters and spark plugs and squirted in some starter fluid, eliminating the simple common fuel, air, and spark problems -- but I because of the backfiring I think your problem is in the timing -- like a sticking valve. Probably more than you want to tackle at home, but might not be as expensive as an engine replacement. Take it to a good small engine mechanic -- best bet is a lawn equipment shop that has been around many years. Drive a little farther to get to one if necessary.

Jul 02, 2010 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

1 Answer

Lawn mower not running


sounds more like the carb sucked up something if u take it off and tear it down let soak in solvent than blow air thru body to dry and clear passages dont mess with adj

Sep 24, 2009 | Craftsman 17.5 hp 42 in. Deck Lawn Tractor...

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