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Post by twinpower on Sept 25, 2013 17:46:48 GMT -5
I've been looking to buy a real keihin 20mm carb for my 139qmb to replace the stock sealed the carb (but not sealed anymore to replace stock jet for bbk). I've looked on other websites but there's look a bit iffy. Does anyone have a link that brings me to a trusted website that sells genuine keihin carbs for a reasonable price?  Any help would be greatly appreciated! |
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Post by rae4180 on Sept 25, 2013 18:41:38 GMT -5
thats the way to go.I have both my scoots useing 20 mm carbs.
gives theam 50cc a little extra push. I have one extra but im keeping it or back up. they hard to find. you can take dremel drill
and horn out the opening of the carb. it works,
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Post by twinpower on Sept 25, 2013 21:07:43 GMT -5
[replyingto=rae4180]rae4180[/replyingto]I'm actually looking to replace my sealed carburetor. but I guess nobody knows where to get a keihin carb  |
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Post by alleyoop on Sept 25, 2013 21:17:49 GMT -5
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Post by JerryScript on Sept 26, 2013 0:18:25 GMT -5
That links to an 18mm Keihin carb, not a 20mm one. BTW- I purchased my scooter from A2Z Motorsports here in Vegas, good dealership! They threw in a Keihin 18mm and an alarm with my purchase, and I still paid more than $300 less than the price for my scooter they advertised on their website! |
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Post by alleyoop on Sept 26, 2013 0:25:48 GMT -5
50s use a 18mm why a 20?? it is not going to do anything more than an 18mm jetted right.
You people think slapping a bigger carb is going to give you something but unless you build the motor up quite a bit a bigger carb is not needed and will not give you anything but waste gas on you and make it harder to tune to get the motor to run right at all throttle positions.
Alleyoop
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Post by JerryScript on Sept 26, 2013 0:31:45 GMT -5
Not sure if it makes a difference to you, but the OP did state he had a BBK, and the title of the thread asks for a 20mm Keihin.
Does a 20mm carb make sense on an 50mm 83cc BBK?
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Post by alleyoop on Sept 26, 2013 1:30:10 GMT -5
83cc is really in the 72cc range but even with a real 83cc which they sell as 100cc a bigger carb is really not needed. Just to give you an example I added 30 more ccs to my motor and am using the same 24mm carb just up jetted the carb. Motors can only suck in so much air and fuel and usually the folks over carburate their motors and actually are loosing power but they don't know it. Dealers will sell you anything and tell you anything to sell you a carb, but ask them a simple question about it and they cannot answer it.
I used to build my own hotrod motors and big Holley carbs, tri-pods and dual quads, even one with 6 deuces on it. So I know carbs, motors and cvts like the back of my hand. These little 4 bangers to me are simple motors actually any good lawn mower and snow blower repair shop will do a better job than a scooter shop mechanic.
Alleyoop
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Post by carasdad on Sept 26, 2013 8:32:04 GMT -5
DX A stock 18mm or 19mm(in the case of the 2 strokes) Is plenty. I see super modded engines using stock scoots..in fact I build them as well. Do a search and read about the folks using 24-28mm carbs..it goes sumpin like thesis.. "Help!New 24mm carb won't tune"..and so forth. A bigger carb does not equal more power...these are 3 cubic inch engines...not 302 or 350 cubic engines like our hot rod cars are...so they are a bit finicky . i.e. my Mustang came with a Holley 500..I put a Holley 750 on and it ran but did take several adjustments to dial in. But again!!.. I was dealing with 302 cubic inches..not 3 cubic inches like a scoot engine. Another case in point...a Stihl 485 Rancher Chainsaw is 50cc...would you put a 24-28mm carb on one and expect it to run well?...No they scream away with that tiny cubed shaped carb they come with. If more fuel meant more speed and power...why not just run your fuel line DIRECTLY into the intake manifold and by pass the carb??...lol..  |
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Post by twinpower on Sept 26, 2013 13:39:35 GMT -5
[replyingto=alleyoop]alleyoop[/replyingto]I'm actually about to go all out on performance parts. so far I have the big valve head and a 52mm bbk. I am about to do a build similar to Larry's stroker Fawkes  |
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Post by alleyoop on Sept 26, 2013 13:54:10 GMT -5
That is nice Twinpower,
But you do not need a Keihin Carb the Chinese carbs work just as good. As a matter of fact my Trike in my sig came with a Keihin and gave me troubles so I put on a Keihin knockoff and have had it on with my mods for now 4 years Never have cleaned it or nothing just adjust for the Fuel Ratio for Colder weather in the fall and Warmer weather in the Spring that is all I ever do to the Carb. Why pay for just a better outside looking carb when they all work the sameo sameo and have the same passages and everything. With that extra money you can buy a good Variator or Belt or Clutch or something else.
Alleyoop
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Post by f4milytime on Sept 26, 2013 15:36:26 GMT -5
 In my experience, the Keihin never performed any differently, or better for that matter, than the knock off did. "Price was the only difference" LOL Buy generic if you do find one. As far as getting a 20mm, I have no idea. I run a jetted 18mm with my kit, and they do great !! My 0.02 ALOHAs
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Post by alleyoop on Sept 26, 2013 15:43:34 GMT -5
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Post by twinpower on Sept 26, 2013 18:58:24 GMT -5
[replyingto=alleyoop]alleyoop[/replyingto]I'm goin to stick with the CV but thanks for the help everyone including you alleyoop. ;D
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..BAD TO THE BONE..
