Kerpit
New member
Hi there
I am seeking some help/opinions on spark plug reading. I'm mainly concerned with the mag side plug which is the one that the base of the plug is only colored 3/4 around. Compared to the pto side it's darker indicating some possible incomplete combustion problems. Both cylinders have 120 psi. This has a psi pipe with 100 pilots turned out 1.5 turns and 147.5 mains. The pics on the bottom are with 110 pilots and 150 mains. Sled runs great except kinda chasing a top end problem. Cleaned clutches and tried a stiffer primary spring and I can get about 70 mph and 7k rpm in 300 yards. Sled idles smoothly, I'm planning on spraying the mag side crank seal with starting fluid tomorrow and rigging up some tooling to pressurize the case. Can anyone shed some light on why the mag side plug base isn't fully coloring???
thank you for your help
100/147.5
this is maybe 5 miles of a mix of idle/full throttle monkeying around
View attachment 57144View attachment 57145
110/150
also misc 5 miles in a field
View attachment 57146View attachment 57147
I am seeking some help/opinions on spark plug reading. I'm mainly concerned with the mag side plug which is the one that the base of the plug is only colored 3/4 around. Compared to the pto side it's darker indicating some possible incomplete combustion problems. Both cylinders have 120 psi. This has a psi pipe with 100 pilots turned out 1.5 turns and 147.5 mains. The pics on the bottom are with 110 pilots and 150 mains. Sled runs great except kinda chasing a top end problem. Cleaned clutches and tried a stiffer primary spring and I can get about 70 mph and 7k rpm in 300 yards. Sled idles smoothly, I'm planning on spraying the mag side crank seal with starting fluid tomorrow and rigging up some tooling to pressurize the case. Can anyone shed some light on why the mag side plug base isn't fully coloring???
thank you for your help
100/147.5
this is maybe 5 miles of a mix of idle/full throttle monkeying around
View attachment 57144View attachment 57145
110/150
also misc 5 miles in a field
View attachment 57146View attachment 57147