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Messages - kymcomandan

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Technical | How To / Re: Agility 125 Starting / Running Problems
« on: October 08, 2011, 12:06:20 AM »
I'm not a hundred percent sure about the name of the needle & seat. In any case there is a valve at the entry to the carb that is controlled by the floats that creates slight backpressure when everything is assembled & working properly. So checking your fuel flow without the carb being attaches is different than when everything is assembled & cranking or running.

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Technical | How To / Re: Carb Jetting Keihin List #071WBC For Bet & Win 250
« on: October 07, 2011, 03:36:23 AM »
Okay, so do you have any idea why it might be surging at mid throttle? Could the needle be moving even though the throttle is holding still? It does have a vacuum diaphram that controls the needle movement. Also I was wondering if there are any other fuel passages inside the carb that may be blocked or partially blocked that could cause the surging? This scoot only has 1200 miles on it so it doesn't have much wear & tear but it did sit for while. Tha gas in it now is good for sure. Idle runs perfect & so does wide open throttle.

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Technical | How To / Re: Agility 125 Starting / Running Problems
« on: October 06, 2011, 02:48:21 AM »
I just put a new clear fuel line on my scooter today. Is there any way you can put a clear fuel line on yours, run the gas past half way empty so there's just a few inches of fuel in the bottom of the tank & check through the clear fuel line to see if you're getting fuel to the carb when it's running or cranking? If you can see fuel getting to the carb through the clear line then it's probably carb related with maybe some junk in the bowl or jets. But if there's no visible fuel flow to the carb through the clear line when it's cranking or running then you have a blockage somehwere between the tank & the carb that could be in the bottom of the tank or the fuel filter, regardless of whether it flows without back pressure or not. Because the carb creates back pressure at the entry to the carburetor by what's called the needle & seat. Your flow test without back pressure is subjective & not a reliable test compared to while the scooter is running or cranking.

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Technical | How To / Carb Jetting Keihin List #071WBC For Bet & Win 250
« on: October 06, 2011, 02:26:01 AM »
I was just wondering if anyone knows how the jetting is set up in this carb? I read somewhere that the jets only dictate full throttle response. Is that true? I felt surging at mid throttle the last time I rode my scoot & when I took it apart found gunk in the smaller jet that sits up above the floor of the carburetor bowl. There are two jets in this carb: One jet is lower in the bowl & the other sits a little higher up in the fuel level inside the bowl. My question is could the surging have been a result of the gunk in the second jet that I cleaned out or is cruise-to-mid throttle metering done without the jets?

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