Hi Jason,

If you are going to run those levels of nitro in your fuel make sure you put some after run oil into the engine after you have finished using it for the day, nitro is acidic and will do internal damage to your motor if you don't do this. I have a Saito 72 in a PC 9 and it runs very nicely on 10% nitro fuel, have a 13 x 8 prop on it so you are ok with your prop.

As for the low end needle adjustment if you are going to play with it just turn it out or in for that matter about an eigth of a turn at a time, it may take a lot of fiddling around but you will eventually get it right. These things are a bit fiddly but start by turning the screw out and putting more fuel into the motor, a rich running engine is ok but a lean running motor can be a short lived one. Remember that the engine leans out a little once in the air.

The problem with this hobby is that there are a lot of "experts" who play with things on other peoples planes and then walk away leavling a bigger problem than you had in the start. Find your the manuals and read them and don't run any castor oil based fuels in a Saito motor, according to the instructions use of Castor based fuels in Saito motors could blow your warranty.

If all else fails come to Toowoomba and I will try to help you, we have two terrific clubs up here and we are happy to help out our Aero modelling brothers from the flatlands