50cc dies to 10mph when engine hot

[skyrider]

Finally got the scooter Wed. The shop rode it for 1/2 hour and couldn't get it to bog out. They said everything looked good and the slight rattling came from a long bolt in the motor mount bushing under the motor. They said that the evap system could be disconnected from the back lower of the gas tank, but I couldn't find it and called A1Racing technical support and looking at the parts diagram they said it didn't have an evap system. They said I was prob riding to hard and actually the carb couldn't fill fast enough so it essentially "ran out of gas". So bottom line, I shouldn't try to redline the scoot for long periods of time. That makes sense, as the day it bogged out to my location at full speed, then after 45 min when I left to return home I rode slower and no problem!! Haven't ridden since, so still not sure. So for $115 I learned there was nothing wrong with the scoot, and for free from calling A1 I learned the probable cause of the problem. Kudos of thanks for Scooter!!!

[sc00ter]

Loosen the gas cap and go and punch it, and see if the problem comes back. I've never heard of a scooter running low on fuel during WOT. I suspect either a fuel line is getting pinched while you are sitting on it (related to the loose bolt for the engine?) or the fuel tank is getting vapor lock from a clogged tank vent, hence the loosening the fuel cap and going for a WOT run. There is also a slight chance the main jet could be partially gummed up, the carb float could need adjusting (they usually get damaged from people manhandling the float bowl-me included!) or..... Anyways, try loosening the fuel cap and going for a WOT run. That "Not designed for WOT runs" sounds strange!