OS 61 FSR-ABC
15% nitro 11x7 APC stock muffler 12700rpm(seal level) Same fuel, same prop, modified stock muffler 13300
any one else still use these engines?
This a very well run, past its prime OS engine..I won it on ebay ... Upon changing the bearings i noticed the sleeve has some deep grooves in it, i can actually see the brass in the sleeve. but seems to run well on the bench...my goal is to pipe it one of these days.