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rigger71
02-25-2013, 05:51 PM
Hello its been awhile since i needed help but im stumped. So i have a sunl vip and i just put a kei hin carb on it right from the start i had to give a little gas to start. So i took the idle jet from my stock carb and put it in no luck. Plus when i come to a stop it stales out or the idle will be at 3k one minute and 2k the next. The a/f screw is three turns out and the main jet is a 79 . The stock was a 78. I also am having a bogging when i give it gas from a roll or from a stop. So any ideas or something im missing. I always wondered why i hate messing with carbs. Thanks

50cc
02-25-2013, 06:46 PM
Drop the needle (raise needle clip 1 or 2 positions) and adjust idle screw on a hot motor.

Admin
02-25-2013, 06:47 PM
Hmmm, so it runs well everywhere else (mid, full)? What's the needle set at?

rigger71
02-25-2013, 08:06 PM
So i should drop the needle to decrease the fuel flow with the needle

Admin
02-25-2013, 10:05 PM
Here's a good diagram to refer to:

http://www.250ninja.net/pics/jet_needle.jpg

50cc
02-26-2013, 12:52 AM
So i should drop the needle to decrease the fuel flow with the needle
Yeah, put air/fuel screw at 2.5 turns out and drop the needle. Then make fine adjustments with the a/f screw on a hot engine till you get the desired result.

bloodymomo
02-26-2013, 11:20 PM
I too am fiddling with a new carb. Boggs from a stop. Everything else is fine. I'm just gunna rejet and maybe play with needle