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Discussion Starter · #1 ·
okay guys i have a cub cadet 108 with a Kohler K241 (10HP) it starts right up and runs for a few minutes then it loses power and spits then dies then backfires (in that order) it has a new carb a new coil,points.condenser,spark plug, fuel lines, new head gasket all thats new it just wont stay runing and im out of ideas i dont want to part this out either
thanks, Gravelyman66
 

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Possibly a sticky valve. When the engine warms up the clearances tighten and deposits on the valve stem and/or guide cause it not to close well. I'd try some Marvel Mystery oil in the gas and maybe a little Seafoam sprayed into the carb while running . That will usually clean them up.
 

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check your fuel pump if you have one
 

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Check your flow from the gas tank to the carb. Not just a quick "few seconds" check but a longer time to see if the flow is restricted.

You *may* be getting enough flow to fill the bowl but the running engine uses more gas than line will flow.

Jeff
 

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Try removing the high speed mixture screw and check to see if the tiny holes in it are clear. Then check to see if the passage between the two sets of holes is clear. If that doesn't help I would bet that there is dirt in a passage somewhere in the carb, providing the carb is adjusted properly.

You did set your points with a timing light didn't you?
 

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Checking points tomorrow or soon don't have a timeing light
Any motorheads/gear heads in your neighborhood? Everybody I grew up with had a timing light ( I guess I'm showing my age of 50 years old :fing20: )

There is a little pop off cover on the right side of the engine ( shrouding for flywheel ) that will show the "S" on the flywheel when the light fires. If it's not perfectly centered in the hole, adjust the point opening clearance ( on the opposite side of course :banghead3 ) until that stamped letter is centered.
 

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Discussion Starter · #12 ·
well dad had a timeing light he just cant find it so i may go to my gandfathers house to see if he has one ordering a head gasket for it tonight the old one was shot
 

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well dad had a timeing light he just cant find it so i may go to my gandfathers house to see if he has one ordering a head gasket for it tonight the old one was shot
Spend the extra dollar or two to get the real Kohler head gasket. The "cheap" ones do NOT have the sheetmetal at the bore, only the exposed cut gasket material.

The "real" Kohler gaskets have the sheetmetal to help reduce the chance of hot gases blowing out the head gasket.

I can get a picture if you're not sure what I mean :fing32:
 

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if none of that helps try the little rod that moves your points make sure it can move freely... i ran into this problem on one of my tecumseh motors that rod that opens the points would end up getting stuck when the motor was hot
 

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sure id see a picture if you dont mind

click for big pic

This one is for my 12 hp K-301 and cost $6.49 at my local Western Auto / small gas engine repair shop. Part number 47 041 15-S

The sheet metal ring helps keep the hot gases from burning thru the head gasket. Of course proper torque is equally important too.

Torque to spec in the proper sequence, run for one hour and re torque when cool. Re torque again after an additional 5 hours run time.

Jeff
 

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Discussion Starter · #17 ·
thank you if none of this works im gonna take it up the road to a guy that fixes these and have him diagnose the engine and maybe just have a complete rebuild
 
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