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I replaced o rings on boots, finally got it to idle. But when I put it in gear it would die. I bypassed the kick stand safety switch and was able to keep it running. Yesterday morning was able to take it down the road a couple miles and back. Was surprised how much giddy up it has for a 400...

Thanks I will try to check the butterfly shaft seals

I plugged off the vacuum ports on both intake boots, the butterfly seems to be tight and smooth, I can't see anything that looks wrong there. The o rings on intake boots seems ok, maybe a little thin Only thing I can think of is replacing o rings and maybe putting some rtv on them. But thanks...

I recently drug a 400 out of the woods where it has been for the last 20 years, I cleaned the starter up got it to turn over, then pulled carburetors and cleaned them up and got it to fire. Problem I'm having is when it starts it revs up pretty high, takes a few seconds to come back to idle...