ORIGINAL: w8ye
I'ved owned a lot of McCoys in the 50's and 60's. I never had one to wear out and I used some of them a lot.
Yet I've seen many that others owned that were ruined. I consider lean running to be the cause!
With today's fuels and synthetic oils, there's not much hope. 25% Castor oil is a must in these engines if you want them to run forever.
Ditto. I've had a few lose a little compression after A LOT of flying (control line), but I've never had one egg out a connecting rod, or lose enough compression to make hand starting difficult. They just ran and ran and ran.
I had one Johnson engine, a .29. That rascal was clearly stronger than my McCoy .35 and .40 engines. It was also stronger than my K&B .35 Stallion (control line/free flight). The Johnson was definitely a cut above all the rest, except Fox. Oops, I almost forgot the K&B .19 Greenhead. That was a great engine too.
My favorite class C control line engine was the Fox .36X, but I loved all of my engines. No one had service equal to Fox.
Ed Cregger