Hello everybody. I got a dilemma with my bike. 79 80 cc motor flying horse. Got about 500 miles or more on it. Stock NT carb. Runs great for about 20 minutes then start acting like it isn't getting gas and just kind of jerks ins acts like it wants to slow down a little bit more like the clutch is slipping. My question is wouldn't the clutch slip from the get-go if the key was slowly coming out. I have an idol it runs fairly good. Until it starts jerking that is. Check the float level everything seems fine but I do notice when it's sitting still the gas disappears from below the fuel filter. Mine C clip is still set at stock. I have a little leak from the case gasket I believe and I tried to gasket it up but only had the black Permatex. Had a loose Jet the other day.im looking at it now so any input is valued..also my mix is 50:1, my plug is choc brown and after i get home i stop and look down and see a "vapor" coming out of my carb filter if that helps. .appreciate it guys beaner