Steve,


I assume you are using your engine as it came, with no extra head shims (not decompressed) and on 20% castor/synthetic blend, or all castor, with only 5% nitro. (If not, this is what you must use)

I also assume you have the #3248 tuned silencer on it.

A good prop size to start from is a 10x6, or for a 3-D model, an 11x4 APC.

You should be seeing over 14,000 RPM on that prop.

If you have the normal #3245 muffler, expect somewhat less RPM.


You should expect over 15 minutes on 10 ounces of fuel.

If you did not do the break-in yet, please follow [link=http://www.rcuniverse.com/forum/Tapered%2DBore_Engine_Break%2Din_%2D_Upgraded/m_1850473/tm.htm]this thread[/link], for a job well done.