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Topics - Greenfield

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Singles / Rockerbox breathing
« on: 06 April, 2018, 17:06:27 »
Ratio describes adding a breather hole to a rockerbox inspection cover to improve breathing in a unit single. I wonder whether anyone has experience of this or have any comments to make about it.
I have just unblocked the breather/drain hole in the inner timing cover of my B40 and with the outer cover still not replaced, it's quite noticeable how much air passes through it as the engine is turned over.

Singles / B40 oil in timing case
« on: 03 April, 2018, 11:18:12 »
I have oil in the outer timing case to the extent that it oozes out of the kickstart. I'm not clear whether its from the gearbox or engine. According to Ratio its normal for some oil to get into the outer casing but it should drain into the sump through a hole near the bottom edge of the inner casing. I've found what was probably the said hole, but it has a tiny brass plug blocking it off. For the record its an early distributor model that hasn't been on the road for many years.
Secondly, there were no gaskets on the joints just goo. Is this correct?
Any thoughts would be welcome.

Singles / B40 piston rings
« on: 26 March, 2018, 17:10:57 »
Does anyone know of anywhere that stocks B40 piston rings? I bought a set of new Italian ones but they are too wide to fit in the bore once fitted to the piston. Seems like its a common problem. I've tracked down compression rings, old stock, but haven't found an oil scraper ring to fit; its +60 thou. There must be some somewhere.
I've got my fingers crossed.

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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