OS SF 61 + pipe
I bought this 80s pattern motor from a popular auction site in very clean, used condition. It's an old engine but nice. This is the regular (non-pumped) "ABC" version.
APC 12x10, 5% nitro, Enya #3, Novarossi 50400 pipe at about 18" plug to baffle (header is 6").
10,300
Any shorter on the pipe and she wasn't having it, so that RPM was it. I've seen a couple hundred more RPM quoted when a bit more nitro is used. Super easy to handle when the carb was set up - prime, plug on, couple of flicks and go. And great throttle response.
Note Novarossi pipe is very similar to Hatori 700.
Correction: header is 6 3/4"
Last edited by SuperNash; 09-06-2016 at 01:48 PM.