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Topics - Greenfield

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Singles / B40 head gasket
« on: 09 March, 2018, 20:42:13 »
The old head gaskets for B40s are 48 thou thick whereas the new ones are 36 thou with a raised lip around the cylinder. Does anyone have any views on why the gasket thickness has changed and pros and cons of the two types?

Singles / Valve guides
« on: 22 February, 2018, 10:37:42 »
I'm fitting new cast iron valve guides to my B40. The first one was cooled in the freezer first, to shrink it and it broke 3/4 in. The second I fitted at room temp and went in no probs. I've now ordered a replacement to complete the job. Has anyone got experience of whether they should be cooled or not before fitting?

Singles / b40 amal carb
« on: 01 October, 2017, 09:40:27 »
Checking over my recent b40 (1963) purchase I notice that the carb is an amal 376/231. According to Ratio it should be 376/253. I've managed to start it but its as rough as hell. Can anybody suggest whether this carb will work or do I need to change it. I don't want to start tinkering with settings if its a no goer. Thanks in anticipation.

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