:?: Just got the full Yosh pro ti. & tri oval silencer installed. No probs. Always been a 2-stroker myself, and finding the transition not quite as hard as I thought. Anyway, the Yoshi papers say to jet to a 122.5 main, assuming stock air filter, cover, etc. The stock main is a 130. They say I should jet leaner? Is this unique to thumpers? On my ring-a-dingers, a more free flowing pipe would mean jetting richer regardless of airbox configuration. I want to keep the airbox lid, and even the snorkel hooked up. I know it sounds dumb, but my riding area demands it. Sometimes, I could use a snorkel myself!