Hello Peter,

The 175CDI is the easiest to set and best running YS so far,

Propeller APC 20 x 10.5PN, you can use this one even for break in with no problems
Oil, even thoug this engine can run very low oil, try not to go under 10%, higher is better the better the lubrication the longer the engine will last
Nitro 25%, but between 15% to 20% should be also ok, 25% will give the lowest idle and the most power
Spark plug, on a well set engine it should last form 80 to more than 120 flights, but the gap needs to be checked every 40 flights, the color on the plug and the overall appearance indicates if the engine is set correctly or not, we run 23% oil and the plug looks very good.

The 160 is a great engine, mines use to run very good with no problems at all, but this engine is waaay better than the 160 in many many ways. You will be happy with it.

Best regards

Alejandro P.