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Old 07-29-2014, 10:39 PM   #1
Madman752001   Madman752001 is offline
 
Join Date: Jul 2014
Posts: 1
Carb issues???

Hello, I have a 05 UM X-Speed 50 scooter with the 50cc Minerelli engine. Just recently installed Scooter Parts Express 70cc BBK kit. Also installed aftermarket exhaust and removed the stock air box and replaced with "open" air filter. Scooter started right up with a little tuning and sounds great on the stand. It revs up beautifully on the stand, the problem I'm having is of the stand it has no power and stumbles off idle all the way to full throttle and will die if you don't release throttle. I went thru the Mikuni carb and put a "90" jet in it and the air mixture screw is at 1 3/4 turns out to get best idle. It starts and idles beautiful but won't run down the road. Any help/ideas would be appreciated. Thanks



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Old 07-30-2014, 04:29 AM   #2
ventoman   ventoman is offline
 
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Join Date: May 2013
Location: Indiana
Posts: 56
My vento does not run right with out the stock air box. No matter what main jet is in it. It just will not run right with a open filter. I put the stock air box back on and then it runs just fine.
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Old 07-30-2014, 08:22 AM   #3
blueboy5000   blueboy5000 is offline
 
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Join Date: Jul 2011
Location: Connecticut
Posts: 493
Does this bike use a slider-style carb? The needle should be adjustable. Lower the clip on the needle by 1 notch ( raising the needle, enriching the mixture)
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2011 Roketa MC-23-150

4T 150cc 157 qmj

24mm carb w 115 main jet and paper cone air filter

Manual petcock w Tygon fuel lines

Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust

RED spring clutch

Adjustable CDI (brand unknown, it's blue and red and works great!)

KOSO high performance variator w 12g sliders

Gates Powerlink 835-20-30 belt

GPS verified 65mph on flats.



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