ORIGINAL: English J3 piper cub
Ive just bought a Thunder Tiger GP 25 ABC w/Muffler. I am wanting to know if it would be a good idea to bench run it or to put it in the plane and run it in.
Matthew,
Your engine is actually an ABN; not an ABC (unless, possibly, if it is a very old example).
Please follow [link=http://www.rcuniverse.com/forum/m_1850473/tm.htm]this RCU thread[/link], for a good break-in.
It will be done on the bench, but will give you a long engine life and less trouble.
ABC and ABN engines should get the same treatment.