dash 50 dies By wahlong (Read 1,298 times)

[wahlong]

i am a auto mechanic ,my friend baught a dash 50 for his son and it runs bad so i agreed to look at it i believe it is fuel starved but i have done all kinds of things ,this is what happens ,take off and with in 100 yards dies and stalls ,waite a min and you can repeat this,new fuel lines and petcock ,oh i am convinced it is fuel starved ,on the origional carb i adjusted the float ,drilled out the seat to flow more fuel ,replaced carb with a new one $24 ,figured what the heck! same symptoms ,driven it with exhaust removed ,thinking it was some kind of guvinor disconnecter speedo ,still same symptoms wont go above 20 mph usually,help! please,bill

[sprocket]

Likely electrical.. how is the spark good and blue? There is a pick-up coil on the flywheel and they can go intermittent...then the CDI missed the pulse and only fires sometimes....

Also set the valve gaps... just to rule them out. They can act like all kinds of other things on scooters
Not sure what the gap is on a 50 cc GY6 but Rich will know... probably safe to go with .003inch

[Bashan]

Most people go with .002" for both valves with a 50cc GY6. A lot of people go with that or do .002" intake and .003" exhaust. Of course if they are noisy after the bike warms up, tighten them up a little. Thanks for the compliment Bud, that means a lot coming from a walking scooter encyclopedia such as yourself. Rich

[sprocket]

See.. I just learned the valve gap on a 50cc GY6. I will add it into the encyclopedia!! Thanks Rich!

I'm never to old or stupid to learn

[wahlong]

thanks ill try valve gap today

[Bashan]

Hey, how about running it with the gas cap loose just to make sure you don't have a venting issue? Rich

[raford3]

When you took off the air filter it ran worse right? If so, I beleive it is getting too much air. If it has a less restrictive filter the carb will not get enough vaccum to operate the needle valve. If it runs on less than 1/4 throttle, but no more this may be the problem. It's too lean at the point the needle operates. If it has an after market filter I'd go back to OEM and try it. I had a similar problem, read my 50cc Air/Fuel mix post.