I'm fully expecting to get flamed by the racing crowd here, but I've run Hobao's Mac .28 engine in my Hyper7 basher for a while now. It's fast (Mine's been clocked at c.45MPH on standard gearing), pretty hardy, piece of cake to break in and tune, and I'm getting half decent runtimes on my standard tank.
I even left it standing for 18 months, a quick clear out of the after run oil and it started within 3 pulls. Sweet.
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