BTW- just received my old engine from Todd. Bearings replaced and he installed the new prop drive washer but without the pins. Evidently I've been running the engine a little rich.... carbon build up. He suggested leaner top end but richer low end. Wish these Walbros came in 3 needle version
Matt,
Perhaps I too had been running SAP #1 a bit too rich.
I leaned out the low end of #2 yesterday and it ran a lot smoother through the transition and got rid of the intermittent midrange burble with a better idle. The engine did not sag on uplines so it was not too lean, and at the end of the day the exhaust residue was the cleanest I have ever seen it.
Some information you passed along that was new to me is going to be of great help. I did not realize that the L needle controls the fuel mix through the vast majority of the RPM range with the H needle only for the upper end, roughly above 7500 RPM. I assumed it was exactly the reverse, similar to a glow carb.
Oy, we learn something new every day!![sm=teeth_smile.gif]
No word yet from Todd about #1, however also no rush as the season is winding down and I still have a plane to fly.