If it's not been started for some time (cold, sitting overnight or longer), give it a couple twists of the throttle to get some gas in there - otherwise, don't ever give it any gas in the starting procedure. Starting cold for my bike consists of pulling the choke (enrichment button), pushing down the start lever until it is stopped by engine compression, pull in the decompression lever and push the start lever about an inch more, release the decompression lever and let the start lever return to top of stroke, and kick! Make it a full kick through the length of the stroke, unlike the short, quick sort of kicks used in starting 2-strokes. If it is in good running condition, going through this routine once or twice should do the trick (minus the throttle part - normally I never give the bike any throttle in starting - only when it's been sitting a couple weeks will I give it an initial prime). When my bike is warm, it's the same routine without the enrichment button, and starts first kick (hot start button not usually necessary). When stalled or dumped, the hot start button is added to the routine, and if it doesn't start right away, hold in the decompression lever with the hot start pulled and kick through about 10 or 15 times(no gas!), then try the start routine again - don't forget to push in the hot start button as soon as it fires up! Have fun!