Sorry forgot to mention, carbs cleaned and checked several times, and crank was sent to CV Tech to get checked for timing and centre seal. I would greatly appreciate any help as I've just about given up, this sled is near mint, it came from an old John Deere dealer that had it stored for the last 20...

I've changed gas three times, carb boots like new, changed ignition coils internal and external, cdi, spark plugs, spark plug boots, checked timing on stator, checked fuel pump, new lines everywhere, checked crank case pressure, new Pistons, cylinders redone, seals all redone, unplugged all electric...

Ok, well I'm all out of ideas, what else could cause this sled not to run, if you can help me that would be greatly appreciated? Thanks

It is not a fuel or spark problem, as I've checked and changed everything possible, I also am a mechanic by trade and worked on many different sleds, this one is very challenging.I got this sled running, but only for about 10 minutes, I took off the centre crank oil injector and blew it out with air...

Ok, Ill let you know if I find something that gets mine going.

Did you ever find the issue with this problem, I am having the same issues and want to know what you found? I had it running without the wiring harness plugged in and it ran ok, not great, but at least it started and idled. Plugged in the harness and I can't get it to run at all, with or without it ...