Always carry spark plugs. Also check to see if you've got gas in your tank. I know its kool to clean out your ole two-stroke bike and race it in a downhill at max. rpm. (Specially if it won't 4-stroke too much) But truth is that you shouldn't do it anymore. It is okay on NEW and SMALL engines, but old and small engines are so clogged up and rusty that they should now run on a lower maximum rpm than before. Of course you could crudit and hammer the engine. Wear a helmet when the wheel locks up in 50km/t. [50 km/h = 31.07000 mp/h]