So from the comment above I'm pretty sure mine is just running very lean right now, but just thought I would ask. I pulled the sled all apart to clean everything up and redo the wiring harness, paint the pipes, put in an SLP cheater head.
So I put it all back together and fired it up today to bleed the air out of the coolant and after giving it some throttle it would idle really high. If I hit the choke the RPM would go back down, but after a bit it would climb back up. Even high enough to engage the clutch for a split second.
The sled has gutted airbox and SLP twins and is jetted for 3-6000 and I'm down at 2200 right now. It's also -24 C today.
The only other thing I was thinking is that the gas has been sitting in the tank for a year so I'm going to mix some avgas with it.