11-28-2016, 09:01 AM | #16 |
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Location: Brisbane, Queensland, Australia
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1971 Garelli Gulp 50cc with open ports and 16 mm Bing Carbie + 1980 Honda XL 223 ZS + 2007 Zongshen LZX200G + DR400SM |
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11-28-2016, 09:40 AM | #17 |
Join Date: Jun 2016
Location: akwesasne, NY-13655
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I guess there is some confusion on Mikuni Carburetor sizes. The model number, like VM 26 refers to the diameter of the venturi. The VM 26 is also called a 30mm carburetor. That is because it measures 30 mm at where it bolts on to the engine. Carburetors have always been measured by the venturi size. All of these carbs are descended, in design, from the English Amal. It is easy to over carburate an engine. A 26 mm carb is close to a 1 1/16th inch Amal. Really fast 250's had 1 1/8th Amals, or about 27 mm venturi. So a 26 mm has proven very good on 229 cc singles. Unfortunatly, Mikuni does not offer a VM 27. I suspect that a VM 28 is just too big without extensive engine tuning, or hopping up. You will also loose low range sharpness by going to a VM 28, or, in other words, flexibility.
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11-28-2016, 09:52 AM | #18 |
Join Date: Jun 2016
Location: Colorado
Posts: 1,107
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I love seeing a thread go on for so long. Very good conversation. zingshoen did you end up using a vm28 and if so how did it work out?
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11-28-2016, 10:01 AM | #19 | |
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Location: Arlington, VA
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11-28-2016, 10:58 AM | #20 |
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Location: akwesasne, NY-13655
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Yes, you could. But modifying venturi's is a very ticklish and precise job. A friend of mine did just that (on a Bridgeport lathe) modification on his Amal GP 1 1/2 inced venturi carb. That instrument was on his flat tracker Gold Star. It worked great at wide open throttle, wooley down low, but in flat track racing, down low didn't matter. You were always above 5000 RPM. It must have worked. That was one of the fastest Beezers at Gardena Raceway. Did well at the Sacremento Mile as well.
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11-28-2016, 11:04 AM | #21 |
Join Date: Mar 2010
Location: Volcano, Ca
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Had one Amal. Man, I hated the carb. It leaked and drowned the bike on a regular basis. Very finicky. The Bing on my Husky was superior, even for a 'tickler".
I had not realized that the Japanese had copied the Amal. I can say they did a vastly better job if they stole the design.
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"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350 |
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11-28-2016, 12:09 PM | #22 |
Join Date: Jun 2016
Location: Arlington, VA
Posts: 258
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I routinely run chinese knockoffs of Keihins modified to have an Amal mounting flange on my Guzzi with Amal compatible manifolds.
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11-28-2016, 12:10 PM | #23 | |
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11-28-2016, 03:57 PM | #24 | |
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11-28-2016, 05:57 PM | #25 | |
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"Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350 |
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11-29-2016, 03:16 AM | #26 | |
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look left then right all yer could see was CR250M Elsinore's... Honda had arrived.... ..
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11-29-2016, 06:28 AM | #27 |
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Location: Brisbane, Queensland, Australia
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i ve got the VM28 in my 200 cc Zong with a custom header and unrestricted muffler - and a quarter turn throttle. there is a bit of re-jetting to be done, i can post the details if someone's interested. I ve optimised the setup over the years and am very happy - bit like a two stroke, though! world of difference to the stock carbie.
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1971 Garelli Gulp 50cc with open ports and 16 mm Bing Carbie + 1980 Honda XL 223 ZS + 2007 Zongshen LZX200G + DR400SM |
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11-29-2016, 06:34 AM | #28 | |
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1971 Garelli Gulp 50cc with open ports and 16 mm Bing Carbie + 1980 Honda XL 223 ZS + 2007 Zongshen LZX200G + DR400SM |
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11-29-2016, 06:44 AM | #29 | |
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1971 Garelli Gulp 50cc with open ports and 16 mm Bing Carbie + 1980 Honda XL 223 ZS + 2007 Zongshen LZX200G + DR400SM |
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11-29-2016, 08:01 AM | #30 |
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I thought somebody said Taco Bell or maybe it was somebody talking about Bultaco and carbs. When I'm half asleep it means the same to me.
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