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Carbs

Posted by Tiger05

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Carbs #1
Tiger05 Charles Ward Mechanicsville, VA, USA	Posted: August 15, 2012 08:13PM Registered: 9 months ago Posts: 71

Has anyone thought about making a new manifold and adapting a small 2 bbl carb to the 1275? Something like a Holley 2300 or a Rochester 2G?

Charles

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Re: Carbs #2
AmishIndy Seth Jones Wheaton, IL, USA 1971 MG Midget MkIII "Guenevire" 2007 Mazda 3 "Porco Rosso"	Posted: August 15, 2012 08:15PM Registered: 2 years ago Posts: 3,076

there is already a webber DGV conversion availible, but really the SU carbs are great anyway. I'd probably consider 4 amahl carbs if I had the money for an 8 port head tho.

Seth Jones

1971 MG Midget

www.SpridgetGuru.com

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Re: Carbs #3
Rabbitman Jerry Slonaker Williamsport, USA	Posted: August 15, 2012 08:28PM Registered: 12 months ago Posts: 123

Those older style carbs are mostly all way too big anyhow for these engines. That's why the 2 stage Weber is so popular as well as the original equipment twin carb setups.

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Re: Carbs #4
Tiger05 Charles Ward Mechanicsville, VA, USA	Posted: August 16, 2012 07:44AM Registered: 9 months ago Posts: 71

Is there a link to the Webber conversion? The original carbs look like 2 larger motorcycle carbs. I have had my time with them so I was looking for an alternative. Are there rebuild kits available for them?

Charles

smileys with beer

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Re: Carbs #5
AmishIndy Seth Jones Wheaton, IL, USA 1971 MG Midget MkIII "Guenevire" 2007 Mazda 3 "Porco Rosso"	Posted: August 16, 2012 07:59AM Registered: 2 years ago Posts: 3,076

Actually those sound like the original carbs to me. Twin SU HS2s is what they oughta be and some hitachi motorcycle carbs work in much the same way. Great carburettors. Lots of parts and knowledge availible for them. Much easier to tune than the webber really. The carbs (any carb) usually gets blamed for the fault of another system. Make sure that the ignition system and your fuel pump are working correctly first. That means check the fuel flow rate and that you have well adjusted points in good condition, your timing is correct etc. Also check for possible vaccum leaks, like unplugged and unused emissions controll ports or a disconnected vac advance line. THEN tune your carbs. Follow the following instructions.

http://www.spridgetguru.com/TuningSU_Crbrttrs_files/TnngSU_Crbrttrs.pdf

Usually all that ever wears out on them are the needle, jet, float needle valve, and throttle shaft.

Seth Jones

1971 MG Midget

www.SpridgetGuru.com

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