keeps cutting out and wont restart for at least 20 min?

Could be a blocked breather pipe on the fuel tank. You can check this easily. When it cuts out, remove the fuel cap - if you hear a pop as the air rushes in and it starts OK, you know that this is the problem. Good luck.

Cliff
May 2008

could be many things ,

a faulty ht lead faulty ones can play up when hot ,
faulty spark plug

could be incorrect fuel mixture ,

could be the soloniod , though im not sure you have one on as i dont know the model of the bike

all very inexpensive pieces to replace

jason
December 2007

Could be a fuel shortage. Disconnect the fuel line at the carb and make sure the fuel is flowing freely.
Or could be electrical - if it is not charging the battery, it will run until the battery is flat. Rev the bike with the lights on full. The lights should brighten as the revs increase.

Neil Melbourne
December 2007