Z,


This is an engine you will enjoy.

The break-in instructions that come with it are rather abbreviated; 3 1/2 lines...

Break it in as described in [link=http://www.rcuniverse.com/forum/Tapered%2DBore_Engine_Break%2Din_%2D_Upgraded/m_1850473/tm.htm]this RCU thread[/link], including the percentage of oil for the procedure.


It is imparative that you never use any less than 20% (I recommend that half of it is Castor) oil in this engine, under any conditions.

Most fuel manufacturers make a fuel that contains the correct amounts of oil.
PowerMaster makes fuel for control-line with 22% oil.

If the fuel available to you contains only 16% (Byron?) and only 20% of that is Castor, the fuel as it is does not comply.
You will have to get some Klotz BeNOL, or Baker's AA (Sig) Castor oil and add the correct proportion of it to the fuel that you use. One of these brands should be available at your LHS.

You can use 10% nitro, but you must first add a single head shim (two in all), under the head.
You can buy one locally and you could use up to 15% nitro with it.


When replacing the head (with the extra shim), verify the sleeve ports remain aligned with those of the cylinder casing.