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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 29818
Experience:  Service manager and technician for all brands of engines with 40 + years of experience.
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Please ref, 16 np Kohler twin ? Ride on 38 inch cut mower !

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Please ref, 16 np Kohler twin ? Ride on 38 inch cut mower ! After about I hour full throttle use, engine splutters to a a stop, , and very Hot, will not start again till cold , took Compression test its equal 152 lbs both Clynders with warm engine, runs perfect till one hour use, and then repeats problem , no airways blocked at all, can not figure out! Is that the right compression for those Cylinders ? Seems high to me, finally engine Smokes when starting from cold, for about five Secs, until choke pushed in. Am at wits End !! Thanks (
Does carb have electric solenoid? What is the engine model number?
The older flat head engines can have tight valves. Runs fine cold, but as they warm,clearance gets less. Causing low power and no start when hot. Compression is ok, but have you checked for spark when hot?
Customer: replied 2 years ago.
Carb Has ( electric ) new Solenoid' ser no ,(###) ###-#### ***** no cv 16 s , h p , 16 / 13. 4
Ok, can you take the old solenoid, remove the inner tip, and install it as a dummy for test.?
Customer: replied 2 years ago.
Done , no difference, carb has all new jets, gaskets the lot !!! Plugs , on inspection Black , but Dry ! Starts perfectly when Cild and normal temp ! Until About one Hours work then stalls as previously Stated ! Al fuel lines clear and clean petrol , can not see Spark failing , as you suggest it Might !!
11-15 is valve section. Do you have the adjustable valves?
Last would be fuel line routing. Could fuel line be overheating and causing vapor lock? Try insulating fuel line.
Customer: replied 2 years ago.
Will try now Thanks , Also for what it's Worth! I have just re moved Coils from mountings, And coil contacts Very rusty, and I mean Rusty as was Magnet on fly Wheel Hav e thoroughly Cleaned all and refit with Airgap! For whatever difference that might make , will make double Sure fuel lines are not as you Suggest thanks
Ok, thanks.
Customer: replied 2 years ago.
Nd nearly finally Curtis it has adjustable Valves Can I Set them Provisionnaly Cold ! And the hot or Cld clearance Pleasenearly Done!!!!
had to walk the dog! .003 to .005 inch cold.
Curtis B. and other Small Engine Specialists are ready to help you
Customer: replied 2 years ago.
Thanks for all your Help! Curtis