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My sons 91 indy 400 has a bog when starting off from a stand still. Once it gets going it is fine. On take off it won't even spin the track like it used to. I don't drive the sled so I didn't know about it until I took it for a spin the other day. My kid says it has been doing this for awhile now. I just had the clutches apart and for cleaning and noticed it had 10M5 (I think) weights. The manual says stock weights are 10MB. So I changed them hoping that it would make a difference. Both the primary and secondary have the proper stock springs. The belt looks fine and sits up about 1/16 - 1/8" high above the secondary sheaves. I was going to take the cabs off and clean them but thought I would get some opinions first. Does this sound like a carb issue.