New here. I inherited a 12mm 044 a few years back and it has always given me fits. S/N 143 770 515
I’ve put in a carb kit still acted up then a knowledge gentleman I know put in another one and same thing. Cranks up, runs fine, starts getting warm warm and the idle gets erratic. Have to keep bumping the throttle so it won’t die. Removed the carb limiters and adjusted low and then high with a tach. Did fine until it got warm again then same thing. Today I check compression with a non-small engine tester (I know I know but that was what O’Reillys had). Got 150 psi cold. Ran it without a load for 3 to 5 minutes and tested again and got 130 psi. While running I sprayed it down with carb cleaner at gaskets, crank seals and boots with no change in idle.
Stuck a boroscope in the exhaust port and spark plug port. I’m not real sure what is good. Piston seems rough. See video links below.
I’m going to do some cutting tomorrow and get it nice and hot until it acts up again then compression test it again. What else do I need to check?
I’ve put in a carb kit still acted up then a knowledge gentleman I know put in another one and same thing. Cranks up, runs fine, starts getting warm warm and the idle gets erratic. Have to keep bumping the throttle so it won’t die. Removed the carb limiters and adjusted low and then high with a tach. Did fine until it got warm again then same thing. Today I check compression with a non-small engine tester (I know I know but that was what O’Reillys had). Got 150 psi cold. Ran it without a load for 3 to 5 minutes and tested again and got 130 psi. While running I sprayed it down with carb cleaner at gaskets, crank seals and boots with no change in idle.
Stuck a boroscope in the exhaust port and spark plug port. I’m not real sure what is good. Piston seems rough. See video links below.
I’m going to do some cutting tomorrow and get it nice and hot until it acts up again then compression test it again. What else do I need to check?