Eric, Rich, Check out this plug.

This plug (BR9ES) was pulled from my 125SX running 32:1 PumpSluge mixed with Klotz supertechniplate. Jetting 1.5 out 45 pilot, 1469g needle clip position 2, 192 main. Temperature 67F, Relative Humidity 60%, Baro 30.12,Dewpoint 53F, AltitudeDensity 358ft. The dirt was a mixtue, some spots sandy, some loamy, not much hard pack. The color of the insulator is a little lighter than the picture shows, this leads me to believe that the heat range is spot on for the riding conditions today. The thick ring at the base of the insulator (2mm thick) leads me to believe that the main jet is way too rich.


This leaves me with a few questions:
How thick should the mixture ring at the base be? I have previously heard that it should be about as thick as your thumbnail, how small is too small?
How much leaner sould I be able to go on the main, down to a 190, 188, lower??
The rest of the carb circuits feel the same as the main jet, so does it also follow that I should be able to raise the clip at least one spot and lower the pilot one spot and still be safe???
I know race fuel would be a wise addition, but this is what I've got to work with now, maybe race fuel next time.

Rich, for the sake of learning, assume that I am using race fuel, although I won't attempt to jet any sharper than I currently am using the pumpsludge. I understand the benifits of using a good race fuel. Each batch is chemically identical, it has the benefit of being stored in a sealed can untill I open it. I would be running U2, but at the time, I didn't have the $$$ lying around to spend on it.

My next purchase is going to be a quality plug viewer. Thanks alot, Rich.

bclapham, Leaning to the point of pinging sounds like a one way ticket to a blown motor, that's a little to scary for me!