J2 wrote on 10/04/10 at 08:09:30:Ah, well. I hear the carb screws on these bikes are plugged, so I would have to drill out the plug before I could adjust that ... at least that's what I hear. I have also heard that it is real easy to drill into the screw while drilling out the plug, and then you buy a new carb. I would tend to leave the mixture alone if I am keeping it stock, since the manufacturer seems to intend that it be mixed that way. My 150cc Kymco scooter did the pop-pop routine until a mechanic set the valves correctly. So, I wonder if the backfire on the Suzy could be caused by valve setting (bike runs great). I also wonder if the carb might be a little dirty. My bike sat up for a number of years before I bought it, with 1200 miles on it. Is is kosher to use some kind of carb/FI cleaner in the fuel? Wonder if that might help. I hear talk about Sea Foam, but I don't know what that is.
J2, the adjuster is behind a plug, but it is not too hard to get it out. I even did it, with no damage. (Ride out my way and we will drill that plug out, if you want.) I have not heard anyone say the popping had anythign to do with the valves, but who knows. It seems the consensus is our bikes run lean from the factory, to meet the EPA guidelines. Carb cleaner would be fine, I am sure. seafoam is a fuel additive, carb cleaner wonder product that some love
and some hate
It certainly won't hurt anything, you can get it from wal-mart or about any other parts place. I have used it through my bike, maybe it helped a little, i think so, but that is just my perception.