alan thanks for the reply, With the plug in it is alot better, but I can turn the flywheel over by hand, not super free but with some effort. it idles fine since I but a o.s. p8 plug in it. The p8 is a very cold plug also. I wanna put a p3 in it. How will i know if compression is leaking at almost tdc? I know a couple of losi sponsered guys that use the 6mm restrictor and love it. I was thinkg of buying it to improve runtime as well