First off, I hate to be one of "those guys" where the first post is a question but I do come hat-in-hand on this.
Picked up a Farmall 460 gas the other day. Guy I got it from had traded a larger tractor for it. He was driving it home and it died. It sat for a year and I bought it.
I suspected the carb and old gas so I drained it and cleaned/rebuilt the carb and installed a new float needle and seat. Reinstalled carb and it started right up and idled and ran perfectly.
Driving it home I made it about 7 miles and it just flat died. No sputter or anything - just running wide open and then nothing.
Towed it the rest of the way home. Every time I cranked it, it would pop off immediately but die as soon as I released the starter. I pulled the fuel line off the carb and got good stream. Pulled carb and went through it again and all looks good. Reinstalled carb and again it would pop off immediately but die as soon as I release the starter.
Out of frustration I held the starter button and it starts and runs perfectly evenly as long as the starter is held. Let go and it immediately dies. Bump the starter button while it is dieing and it restarts and runs smoothly as many times or as long as I do it. It's just like turning off the key when it dies - not a single pop or sputter while dieing.
So I'm suspecting something electrical like a short killing the spark and possibly enough residual voltage when I touch the starter button to keep it running. It's not like the starter is dragging the motor around.
Any suggestions on where to start looking? I have what was supposed to be a factory service manual but it doesn't have the electrical schematic in it.
Thanks in advance,
John
Picked up a Farmall 460 gas the other day. Guy I got it from had traded a larger tractor for it. He was driving it home and it died. It sat for a year and I bought it.
I suspected the carb and old gas so I drained it and cleaned/rebuilt the carb and installed a new float needle and seat. Reinstalled carb and it started right up and idled and ran perfectly.
Driving it home I made it about 7 miles and it just flat died. No sputter or anything - just running wide open and then nothing.
Towed it the rest of the way home. Every time I cranked it, it would pop off immediately but die as soon as I released the starter. I pulled the fuel line off the carb and got good stream. Pulled carb and went through it again and all looks good. Reinstalled carb and again it would pop off immediately but die as soon as I release the starter.
Out of frustration I held the starter button and it starts and runs perfectly evenly as long as the starter is held. Let go and it immediately dies. Bump the starter button while it is dieing and it restarts and runs smoothly as many times or as long as I do it. It's just like turning off the key when it dies - not a single pop or sputter while dieing.
So I'm suspecting something electrical like a short killing the spark and possibly enough residual voltage when I touch the starter button to keep it running. It's not like the starter is dragging the motor around.
Any suggestions on where to start looking? I have what was supposed to be a factory service manual but it doesn't have the electrical schematic in it.
Thanks in advance,
John