Ray, Frank, Wiqar,


If any of the engines you are breaking in is of a tapared-bore type, here is a good [link=http://www.rcuniverse.com/forum/Tapered%2DBore_Engine_Break%2Din_%2D_Upgraded/m_1850473/tm.htm]procedure[/link] to follow for break-in.

This will not be the right procedure if it is a ringed engine, or a lapped meehanite piston/steel sleeve engine.

Cold weather will make an ABC/ABN even tighter and it is a good idea to use a heat gun on the cylinder and the head, to facilitate start-up the first couple of runs.


Ray, the heat-cycle method is good only for a lapped meehanite piston/steel sleeve engine.
For all other engine types it is a mere hassle.