G'day Mike,

I have no idea what Enya says, but my understanding of running in ringed model engines was that they required high (full) throttle so that there was sufficient combustion pressure to seat the ring and allow it to bed in. So nice and rich for cooling and lubrication and full throttle for sufficient combustion pressure.

Having said that I guess there's no rush to get to full throttle, and I can't imagine that your half throttle running would have done any damage, perhaps just slowed the process down a bit.

I do know that with full size aviation piston engines, if the initial running is done at to low a power setting, there is a possibillity of glazing the bore with the result that the ring never seats. You end up with low power, high oil consumption, fouled plugs, grumpy engineers etc.

There are two things that contribute to the feel of an engine that we describe as 'compression'. One is whether there are any leaks, but the other is to do with the design of the engine ie compression ratio.

A two stroke engine set up for high nitro (low compression ratio) will feel different, when flipped over, to a low nitro four stroke for example.

I'm guessing you know this but when you compared to your Saito it made me think.

Any way I reckon you should go and fly it. Not to lean and not too many long slow high power climbs. Big loops and wingovers help cooling and vary the load nicely.

Cheers

Dave H