So I finally got some time to test on some good snow, packed. Seems the clutch engages just fine. When I start from the base of Carb adjustment (Walboro) with High out 3/4 and low 1 turn it will run just fine for a bit but as it gets hotter it will start to bog down. I have tried various adjustments...

How do I know what kind of comet it is? I don't see any markings on it other that it is a comet? Did you only disassemble the Secondary clutch? Is that were the spring your refering to is? Thanks so much for your help!

Thanks guys, appreciate the response. def will get a new fan belt. The sled does seem to be sluggish or under powered. Seem to pick up a bit when I put in the plugs that were originally in it (Bosch, have to see what they were). I believe they are the 1/2 reach. Would a hotter plug help with its lac...

Not sure what plugs to put in a 1973 John Deere 400 340 CCW KEC engine. I have seen the KEC 340 with a \ but I don't know what that extra nuber is. The tag on the engine has no such \. I currently have B8HS in it. Are these ok? Please help.

The belt is 1 & 3/16" X 43". It is what the specs called for. It does bog down when it stops as if it is dtrying to engage the clutch. I put it on blocks and got the rpm's up enough to see if the primary & secoundary engage and they do. The track spins just fine. had it out on snow...

Hello, New to the vintage sled world so I will try my best to sum up my issue. I have a 1973 John Deere 400. It has a 339 CCW engine & a Comet clutch which I am assuming was added aftermarket. I have finally got it running and got snow but it just wont go. If i put it on blocks the engine revs &...