The boys have pretty well covered it
I agree with Giz on the fuel. 25% is all you need and it is more friendly on the motor.
If you have nearly a gallon on it, I would switch to 25% and remove the break in shim. Run a hot or super hot plug (OS P4 or P3). Lean it out some and when you hit the 1.5 gallon mark put a full race tune on it and stand back
Change the rod, pin and clips at 2 gal as suggested (just as a one time precaution).
Run the 7 mm restrictor, and if you are looking for 10+ min run times go to the 6.5 mm restrictor and maybe look at reducing the head shimming a little. Go to Massive Mods web site and check out his "Head shimming 101" article - http://www.massivemods.com.au/produc...roducts_id=192
I run 25% with a total of .6mm shiming (as opposed to .8mm standard). Makes the engine run a little warmer and the pipe run a little cooler, plus better run times.
You will love your 5 port, they are a beast. All you have to do is work out how to tame it down via the clutch etc if you are running it in a buggy. If it's in a truggy just go hard