Rich beyond the dreams of avarice

Amac 10MDY and Amal twin floats

What a lash up!!! Just in case anyone was wondering how the carburation was developing on the 1930 M90 I thought I’d post this picture of the steps taken to check and correct the float height on the Amac 10MDY currently fitted to the bike. It’s the wrong carb for the year and I’d like a later Amal 29/001 if anyone can help but “we are where we are” on this one…

The Amal twin floats are most likely 15 degree items that have been machined to operate on the level so to speak. But they were clearly never designed to operate with the Amac. After making up a new, elongatedĀ float chamber holding bolt complete with a spigot for some clear plastic pipe it was easy to see that the float level was some 6mm too high. Adding the aluminium spacer drops the level back downwards and this setup should help with fine tuning once back on the bike. I’ll make up a proper brass spacer and new banjo bolt once the correct dimensions are established as the existing one is too short to work with the spacer.

All this is yet another example of how much time can be spent trying to get groups of disparate components from different eras to work together with some degree of harmony.

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