I currently have a 99 Scrambler 400 4×4. The guy I purchased it from said he put a 60 over piston and rings on it but I have not taken the top end off to verify this. I am having a couple problems. 1) Starts up good and idles fine, hit the gas to move and it wants to die. pump the throttle to get it moving and it will runs good. It just bogs on take off. Any Ideas? 2) He said he was running Klotz in it non stop at 40:1. I have been doing the same and it smokes bad. I have had 2 strokes before and know they smoke some but this seems a little excessive. Should I try a different oil? any suggestions would be helpful!!! Thanks