Originally Posted by
bigmatt
actually running it cooler as you suggested at around 220 instead of 250-270 before I shut it down today was loosing pinch/turning over easier/running super smooth. It just wanted to go to the 250ish range but by leaving flush would drop down to 220's while running. Then this afternoon everything was going good then out of the blue went to crap like another air leak. You know how they want to rev up as they get hot? Go lean thats what happened. But you were right the more I ran it the better it got.
it shouldn't rev up when hot and not when cooler, sounds like a average woman thing,
an air leak will just make it not hold a tune and idle irratic.so you may have created a average woman bottom from trying to compensate for the air leak....you'v already stated that you have found that the front bearing does have a leak, once that is rectified just double check your bottom end tune again.
.........as for shutting down, Don't stop an engine by blocking the pipe (except in an emergency/runaway) also stopping by the flywheel is also not good, (except in an emergency/runaway)
I at the end of a race bring Truggy in to pits, my pitman sits Truggy on starter box still running, to let the engine climatise while I walk down the drivers stand stairs, then I stop my engine by pinching the fuel line and starving it of fuel, check it is at BDC then turn off truggy and radio.