ORIGINAL: Toxik
After re-reading the manual last night I noticed that the angle of the plane could have an effect on how it runs if it is tuned improperly. Last night when I was trying to run the motor, the front of the plane was quite a bit higher than the back of the plane. So today I will start by changing the angle of the plane to see if there is any difference in how it runs. Unfortunately the design of the plane makes it so I can't take out the fuel tank unless I start cutting part of the inside of the fuselage.
No this does not make a "big difference" as to how the engine runs at all!
The tank height to carburator height merely affects the siphoning effect of fuel running into or out of the carb.
If the carb is lower than the mid level of the tank you MAY experience some siphoning INTO the carb. With the throttle set to idle, this should be no more than a SLOW "drip".
Conversely if the tank is too low the fuel will siphon back into the tank SLOWLY at idle setting, making the engine more difficult to prime initially.
Once the engine is started, the tank/carb difference will have almost NO effect on any typical ARF... On a typical ARF the most you can affect the tank/carb difference is usually LESS than .5" or so, which is done by inverting the engine.
You have not done that, so there is no problem with this.
Examine the order you have things on the engine...
Assuming an engine w/o the prop/spinner installed...
On some O.S. engines there is a small metal thin "washer" that goes onto the prop shaft. This looks like a very fine washer and is VERY important if your engine uses one. This goes on first.
Next there is usually the prop driver. This is supplied with the engine, and is a cylindrical piece with "teeth" on it's surface to grip the spinner back plate.
Next you put on the spinner backplate, usually with a spacer ring to keep the spinner centered.
After the spinner backplate, comes the prop itself.
After the spinner backplate there is a stronger thicker metal prop retention washer.
After the prop retention washer, the prop nut itself goes on. This must be put on so tight, that you'll swear you are going to break the prop itself!
On larger models you may have a jam nut and/or a spinner retaining nut. The latter may have a thread at the end for the spinner bolt.
After this is the spinner itself, followed by the screws or bolt used to retain the spinner.
Is your assembly put together as per the above?
I've seen novices omit prop nuts, or the prop retention washers...