shortman1166
Scoot Member
Posts: 52 
Location: Lafayette, Indiana
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Post by shortman1166 on May 13, 2018 15:11:13 GMT -5
I took my scooter for a ride today with the new BBK installed and got the pilot dialed in perfectly I think(#32), I can idle down to about 800 RPM if I turn the idle down and it starts right up and comes off idle perfectly but I went for a ride and after about 2 miles it was surging at WOT then stalled. I got it back home and went from an 80 to an 85 main jet and haven't had time to go for a longer ride yet but it has a slight hesitation then recovers all the way to WOT if rolling open on the throttle from at about 1/4 that moving the jet needle doesn't seem to change. Is it a hint that my main is still to small or do I need to install a washer and raise the needle even more? I pulled the spark plug and it looks light brown, not white or black.
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Post by pinkscoot on May 13, 2018 22:49:06 GMT -5
Tuning is a process that requires tuning the whole system one step at a time. each component works together at some point. get your Main jet tuned in and working well at WOT then the needle for 1/8th to a little over 1/2 and last the and last the pilot jet by way of the A/F needle. Do some research about carb tuning and you'll have an ahh hah moment and it will be clear to you. Start here and Brent makes it very clear. |
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Post by sjfishon on May 17, 2018 8:22:24 GMT -5
I had a simular problem.I found there was 2 o rings put on the needle,I took one off and it works perfect.it would not recover,and sometimes would kill,on a fast rev,hope this helps. Steve
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shortman1166
Scoot Member
Posts: 52
Location: Lafayette, Indiana
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Post by shortman1166 on May 21, 2018 15:42:32 GMT -5
Found my problem, the gas cap was not properly vented causing fuel starvation by creating a vacuum in the gas tank. Now it runs great with an 85 main and 30 pilot with a 47mm bbk installed and derestricted airbox.
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Post by magoconnor on May 21, 2018 15:54:20 GMT -5
How did you fix it?
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shortman1166
Scoot Member
Posts: 52
Location: Lafayette, Indiana
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Post by shortman1166 on May 21, 2018 17:32:20 GMT -5
I just drilled a small hole in the gas cap. It already had one started but they didn't make it all the way through so I finished it. Just a small one 1/16 of an inch is all I needed not so big that gas would come spilling out, but enough to vent and the cap is under the seat so I don't have to worry about water.
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Post by sjfishon on May 25, 2018 9:10:52 GMT -5
Can you show a picture on how you drilled the hole?? Steve
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Post by sjfishon on May 25, 2018 9:14:06 GMT -5
I. See on mine there is a smallchannel,below the rubber gasket,but it seems to run around and just end...cans really see how it vents steve
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Post by sjfishon on May 25, 2018 19:33:31 GMT -5
I have a dif cap,mine pops up and locks with the key.can't see how it vents.
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shortman1166
Scoot Member
Posts: 52
Location: Lafayette, Indiana
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Post by shortman1166 on May 25, 2018 22:16:06 GMT -5
Are you having issues with yours running? I was having all kinds of issues that I initially thought was a jet or valve problem and all it turned out to be was the cap and a 10 second fix. Some tanks have a second vent with a charcoal filter on them, I would check to see if yours has that.
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Post by GrumpyUnk on May 28, 2018 11:58:48 GMT -5
shortman.. I think you had an incomplete bore and your drill finished what should have been done at the factory. You were correct to not get a 'direct' hole all the way through as I think you'd have problems with fuel splashing out and spreading, making your machine a potential Molotov cocktail.
The other style cap, with the flip-up cover and key lock, seem to have their vent on the underside of the cap, out near the edge where there is a slot cut. I assume the slot leads to an internal opening for air to pass into the tank as fuel is withdrawn. Could be mistaken.
tom
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