The following is a copy of a PM I sent to JMech. After sending it I thought this one may be a good brain teaser for members at large. Anyway, here it is:
Leave it to me to get another headache in the shop. Working on a 17hp single cylinder Kawasaki in a Deere mower. Engine is running HOT--so hot it shuts off/runs rough after 15-25 minutes. So hot it dropped a valve seat. I have replaced all fuel lines and cleaned fuel tank. Put on a new carb solenoid--was working intermittently. New spark plug. Engine is spotless. Flywheel key is fine (put in a new one anyway).
So me and some mechanic friends are thinking must be the coil/igniter combo (igniter is not a separate unit). Using the Deere service manual, old coil did not test out well. Bought a new coil and it bench tests fine. bolted it in and for the heck of it checked one more time, now it ohms way out of spec--its weird, it ohms way high, around 1200K, but falls to 950 (using 2 different meters). Book value is around 20K. I'm confused, why is it not reading correct now? could being near the magnet "charge" something like an old school condenser?
Would you just bolt it together and see what happens? FWIW, it cranks and runs fine, plenty of power but when it gets hot it will either die, sputter/surge/ or spark knock--even seen the oil light come on at low RPM--think its that hot. My temp gauge reads 350F on the carb bowl (carb is 2 inches above muffler. FWIW, mower is pristine, all original, no heat shields missing. an absolutely pampered one owner machine. Got any thoughts? 3 genuine Deere mechanics are stumped. No its not mine, helping my cousin.
Oh yeah, I have even poured water on the fuel pump and opened the fuel cap thinking that was the issue, no change.
Leave it to me to get another headache in the shop. Working on a 17hp single cylinder Kawasaki in a Deere mower. Engine is running HOT--so hot it shuts off/runs rough after 15-25 minutes. So hot it dropped a valve seat. I have replaced all fuel lines and cleaned fuel tank. Put on a new carb solenoid--was working intermittently. New spark plug. Engine is spotless. Flywheel key is fine (put in a new one anyway).
So me and some mechanic friends are thinking must be the coil/igniter combo (igniter is not a separate unit). Using the Deere service manual, old coil did not test out well. Bought a new coil and it bench tests fine. bolted it in and for the heck of it checked one more time, now it ohms way out of spec--its weird, it ohms way high, around 1200K, but falls to 950 (using 2 different meters). Book value is around 20K. I'm confused, why is it not reading correct now? could being near the magnet "charge" something like an old school condenser?
Would you just bolt it together and see what happens? FWIW, it cranks and runs fine, plenty of power but when it gets hot it will either die, sputter/surge/ or spark knock--even seen the oil light come on at low RPM--think its that hot. My temp gauge reads 350F on the carb bowl (carb is 2 inches above muffler. FWIW, mower is pristine, all original, no heat shields missing. an absolutely pampered one owner machine. Got any thoughts? 3 genuine Deere mechanics are stumped. No its not mine, helping my cousin.
Oh yeah, I have even poured water on the fuel pump and opened the fuel cap thinking that was the issue, no change.
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