i would go with a Hyper .21 8-Port engine, its about £160-£170 (depending on where you go.) the hyper .21 engine is a really powerful engine. its hard to get it broken in to start with, but after that is done, it can produce the sort of power you can only dream of handling. (don't let the "breakin in" part put you off it). its really a reliable engine and fast (as most hyper owners would probably tell you. if you have the correct gears for this engine, you are looking at a speed at about 50Mph, but with a higher percentage nitro, engine tuning and upgrades, it can go alot faster. the engine uses a starter box to get running, but you should be able to put on a pull starter for it.

i would go with this engine if you want powre!!!

hope this helped!