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Post by jackthefuzz on Aug 3, 2007 11:25:19 GMT -5
Ok guys, some of you know that I have been struggling to get a 30MM keihin PWK carb to work correctly. I stumbled upon this article and while its for a 2 stroke, the procedure was spot on for my gy6 and I finally have this thing working. scootrs.com/tech.cfm?tip=tunecarbthe carb came with a 40 low speed jet and a 138 main. I ended up with a 39 low speed and 132 main |
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mika
New Puppy Dawg
Posts: 3
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Post by mika on Oct 6, 2007 12:14:37 GMT -5
Which size cylinder do you have? And the needle position?
I have a 155 cc cylinder and an 30 mm Oko (which is a clone of the Keihin 28 mm) and trying to find the right combination. The original jets are same as yours.
Mika
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Post by wildbill84 on Jan 14, 2008 21:17:55 GMT -5
Thanks for the link, it's just what i needed
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Post by Aerostudent on Jan 15, 2008 14:03:27 GMT -5
Great article, thanks!
Aero
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Post by motomech on Feb 25, 2008 20:16:06 GMT -5
Ok guys, some of you know that I have been struggling to get a 30MM keihin PWK carb to work correctly. I stumbled upon this article and while its for a 2 stroke, the procedure was spot on for my gy6 and I finally have this thing working. scootrs.com/tech.cfm?tip=tunecarbthe carb came with a 40 low speed jet and a 138 main. I ended up with a 39 low speed and 132 main So you are saying that your scooter starts, idles ands runs cleanly though the r.p.m. range? I'm surprised since I would think you would have to change out the needle jet(since it is a two-stroke carb., it would have an emulsion tube instead of the four-stroke carb.s nozzle). Oh well, stranger things hace happened. I got to think, for everything except full race, a CV carb would be better. Motomech in Costa Rica |
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Post by finnie9 on Jul 17, 2008 12:13:31 GMT -5
Can someone post a photo showing (or describe) the location of the fuel mixture screw on the CF Moto 244cc engine? I can't find the thing.
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Post by kink on Jul 21, 2008 10:33:58 GMT -5
Wow, that was a very in-depth article. For most people on this board who are running CV carbs I think a lot of that information may be overkill, but it's still cool from a general interest standpoint.
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Post by swakk on Jul 22, 2008 15:28:35 GMT -5
under the carb near the end of carb to the intake pipe of cylinder head  |
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Post by finnie9 on Jul 22, 2008 18:54:28 GMT -5
Thanks, swakk.
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Post by dtwscooter on Jul 23, 2008 10:11:03 GMT -5
Ok guys, some of you know that I have been struggling to get a 30MM keihin PWK carb to work correctly. I stumbled upon this article and while its for a 2 stroke, the procedure was spot on for my gy6 and I finally have this thing working. scootrs.com/tech.cfm?tip=tunecarbthe carb came with a 40 low speed jet and a 138 main. I ended up with a 39 low speed and 132 main Great link! I noticed they put a lot of importance on the needle tuning siting that needle is responsible for 1/4 to 3/4 throttle range response. Yet, I don't see people posting about that here. Has anyone tuned with their needle setting? Any experience? |
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Post by gy6rocket on Jul 28, 2008 12:07:26 GMT -5
I've done the needle setting a few times. It has 5 settings, the top clip position is full lean, and the bottom clip position is full rich. I have not done the needle adjust on the CV, because right in the middle seems to be the sweet spot. I did the needle tuning on my flat slide carb, which is essential to the carb running good. Its also easier to needle tune since you don't have to mess with a vacuum diaphragm when using a flat slide.
If you really want to dig into the CV carb and fine tune it, you can try moving the needle clip position, but I don't think you will see much result unless you are running free flowing intake and exhaust.
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