I have a hawk 250cc Chinese dirt bike with 80 mph on the speedometer but I only can get it to 50mph what could I do to get it to 80mph

A carburator jetting and cleaning. Also an ignition improvement. U need a clymer shopmanual or go to a motocross speedshop

About 80\90 mph

The only figure I could find was 70 mph. But from all the research, what the bike is known for is power and reliability. It is also extremely strong and can take a tremendous pounding. It is right up there with the comparative Yamaha'sn Suziki's and the KTM. Good ,uck.

I would try http://www.amazon.com it has tons of stuff for all type motorcycles.

Good luck

I would check the fuel filter, it should be changed every 20,000 miles or so. Also I would check the fuel pressure at the test port. I would also check for a weak ignition coil.

what condition is your air filter in? put in some new plugs and go from there. if the air filter and new plugs don't fix the problem check yorclutch adjustment.

Howdy: I have had the same problem and it turned out to be a short in my kill button. When the bike would sart to vibrate (80mph) the slight shaking triggered a short in the kill button. Disconnect it and try it again at 80 mph. If not it is a open in the main fuse circuit that can kill all power. Also check your battery cable being loose. Good luck - Doug

nope,,,,,try plugs first then tune carbs and a compreshion test wont hurt just incase its a piston or velve burt out,,,,,and whats wrong sounding like an old chevy at 80mph? thats how i sound!!!! at 80mph

mine did 76mph and i used Shell V-power but i weight 12stone so if your less then it will make a differance