Finally got new tires this week and took it on its first drive today.
When I pulled the head after I bought it last year, I found the engine had been overhauled with high compression pistons. Everything measured out within spec and I cleaned everything up and buttoned it up. Installed an overhauled carburetor and I went through the magneto. Engine starts easily and runs great with the timing retarded. When I advance the timing more than halfway at idle, it starts sounding like one or more rods are loose. Its sounds like something is banging pretty good. Its definitely not a happy noise. Retard the spark and it purrs like a kitten. I am at about 4600 ft altitude. I put fresh regular grade gas in it.
Is it possible it needs higher octane fuel to keep it from knocking or is the timing just set too advanced? I put the magneto back timed the was it came off. Tractor had not run for 30 plus years, everything was intact as if it was parked one day and left to sit, so i just put it back that way.
When I pulled the head after I bought it last year, I found the engine had been overhauled with high compression pistons. Everything measured out within spec and I cleaned everything up and buttoned it up. Installed an overhauled carburetor and I went through the magneto. Engine starts easily and runs great with the timing retarded. When I advance the timing more than halfway at idle, it starts sounding like one or more rods are loose. Its sounds like something is banging pretty good. Its definitely not a happy noise. Retard the spark and it purrs like a kitten. I am at about 4600 ft altitude. I put fresh regular grade gas in it.
Is it possible it needs higher octane fuel to keep it from knocking or is the timing just set too advanced? I put the magneto back timed the was it came off. Tractor had not run for 30 plus years, everything was intact as if it was parked one day and left to sit, so i just put it back that way.