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Post by blazejin on Mar 31, 2019 11:35:08 GMT -5
Ok everyone, here we go I have this all famous 50cc all stock Chinese Scooter. It will only start and run as long as the breather box is off and my hand over the carb., just letting the slight bit of air in. I have tried 4 carbs with same results. I have checked the enricher, Vacume leaks, Petcock, floats in the carbs was checked, jets cleaned, One of the carbs came off a stock 50cc that runs perfect with the carb. and all other carbs work on other stock scoot, I sprayed starting fluid all over the thing while I had it choked to run , no sign of vacume leaks. sprayed in intake boot nipple an ran till it burned off. What in the blazes is going on ?
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Post by tortoise on Mar 31, 2019 13:29:11 GMT -5
sprayed in intake boot nipple an ran till it burned off That would appear to indicate that fuel is not filling carb bowl? Does this scooter model have a floorboard-level gas tank and a pulse-pump . . or seat-level gas tank and gravity flow?
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New Rider
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Posts: 37
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Joined: May 20, 2016 16:26:12 GMT -5
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Post by blazejin on Mar 31, 2019 14:19:36 GMT -5
Gravity flow, 139qmb ,I changed all vacume lines again, and that got it to idle. Try to throttle then it wants to die, so I am guessing float not level, getting too much gas or to big of main jet. (cause I know the petcock is good) that sound about right ?
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New Rider
Currently Offline
Posts: 37
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Joined: May 20, 2016 16:26:12 GMT -5
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Post by blazejin on Mar 31, 2019 14:23:09 GMT -5
oh and I have the air fuel mix screw as close as I can get as well
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Post by tortoise on Mar 31, 2019 14:52:30 GMT -5
Is the carb bowl vent port (bent hose) open to atmosphere?
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New Rider
Currently Offline
Posts: 37
Likes: 1
Joined: May 20, 2016 16:26:12 GMT -5
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Post by blazejin on Apr 5, 2019 9:58:18 GMT -5
I got it , had wrong main jet, needed a , had a 75 in it, I had it starving lol, dang small #s thanks for the help
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