First
We are not building a space shuttle or working for Nasa, If the timing is +1 to -1 deg the engine will run about the same.

I never said the piston would go up and down 10-12 deg I said the crank would have that rotation play when the piston is set to the top of the cylinder.

I have probably timed over 200 engines in the last two years and they all seem to be doing fine with plenty of power and easy hand starts.

Take a couple day's and read about the engines I sell.
http://www.rcuniverse.com/forum/m_7661620/tm.htm

Milton

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