i have no experience in building this any ideas

i have a 2 horse power lawnmower engine and i want to build something that i can drive. i am open to any suggestions. i was hoping a bike with a lawn mower engine or some kind of little pocket bike.

just bought a shit load of snap and pop poppers. the ones you throw on the ground. i want to see an explosion or something of that sort. any ideas?

oh sorry its a ball valve. i made the mistake in buying a ball valve intstead of a solenoid.

okay so yesterday i made my 2nd potato gun. its air powered (pnuenmatic) and it was working great. today i go out to shot it and the he valve is leaking bad. at 20 psi the valve just spits air out like crazy. theres nothing jammed into the valve that i can see. is there any thing i can do to fix it?

okay this is my first post here :o ! so anyway this is my second potato gun. my first one just broke and is easily fixable. i dont want to fix it so iam going to make a new and better one. so with these solenoid valves how do they work without moding? can they run on a battery and have a button to p...