I don't believe that this bike takes coolant. Oil injected. I think, Can't find any type of resivouire(bottle thingy).

 

Ok its oil cooled and not water cooled.

 

I checked the head gasket, that doesn't seem to be it. Possibly just bad gas and or the throttle position sensor. I ran it with some heet in the tank and was able to geter up to 50 mph. Still sputters if Igive it quick gas, but if I creep up then give it gas it really goes. Do you think it the override on the reverse goes out would it affecd forward aswell?

 

Did it run better after you cleaned the carb? It could be some bad gas.