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Amal monobloc deformed for my 650.

Submitted by rowand_tait on Mon, 01/08/2022
Forums
Heavy Twins

I have just found out that the slides of my left hand carbie is sticking. I have tried the pinch it trick with the body of the carbie, with some success, but I am not happy with the result. 

The amal is now quite old (1962) and new ones will cost around 400quid to replace the pair. Are there any alternatives for the amal that don't cost the earth? 

Has anyone had any experience with alternatives and with what success? 

Cheers.

Submitted by neil_wyatt on Tue, 02/08/2022

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My advice is a single carb conversion.

A single 930 Mk 1 concentric (30mm)  set up as per Mercury.

No carb issues since. 

Submitted by mikael_ridderstad on Tue, 02/08/2022

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If you don't usually push your bike to its limit, a single carb conversion makes things easier. Not very big loss of top end power. In fact fine tuning of twin carbs is often so difficult that you get better result with a single carb. A Mikuni VM could be an alternative to the AMAL Concentric if you find a suitable inlet manifold.

Submitted by steve_marshall1 on Tue, 02/08/2022

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They seem fine. Weirdly heavy compared to a "genuine" concentric. But you aren't going for authenticity are you?

 

Submitted by anthony_curzon on Tue, 02/08/2022

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You can get your carbs re-sleeved, as i have had all my own carbs,re-sleeved. The throttle slide fits better in the body of the carb. Martyn Bratby does this type of work. 

Submitted by robert_tuck on Tue, 02/08/2022

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I would find a single carb manifold and fit the remaining good monoblock .  If you don't like the result then a new  amal concentric  could be fitted. 

Submitted by jonathan_newton on Wed, 03/08/2022

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I  have a few spare monoblock bodies, email me and i'll send you details.

 

Jon

 



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