I bought a Revo on Friday, did the break-in according to the book. Tuned in on Saturday morning. The HSN is about 1/4 turn leaner than factory set. It will run great 'til it gets up to temp, about 220. It shifts fine, but when I go to slow down and turn around it dies. It will start right up, but keeps doing the same thing. Any Ideas? The engine, I think, is still running a little rich as I see a good amount of blue smoke and I'm still getting a little bit of unburned oil/fuel out of the exhaust, but not as much as when it was breaking in. When I lean it out anymore, it dies at high RPM. I've done the pinch test and the engine runs for 3 seconds then dies. I've put in a MC-59 plug. I'm running O'Donnel 20% fuel. The car had the same problems with the stock plug. It's been about 70_° here lately.