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Singles / Re: Rockerbox breathing
« on: 07 April, 2018, 11:57:35 »
Many thanks. I wasn't thinking of rushing into it particularly as it wasn't original spec. Getting the engine running sweetly is my first priority.
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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.
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.
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Singles / Re: B40 Front Hub
« on: 03 April, 2018, 18:37:34 »
Sorry for the late reply. The two wheels rebuilt with chrome rims and ss spokes came to £350 inc p&p
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Singles / Re: B40 oil in timing case
« on: 03 April, 2018, 15:28:08 »
We now have a drain hole. I'll probably have a go at reassembly tomorrow.
Many thanks.
Many thanks.
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Singles / Re: B40 oil in timing case
« on: 03 April, 2018, 13:35:17 »
Thanks. A 1.5mm drill fits well in the back of the hole. If I can't dislodge the brass plug I'll redrill a hole in the same vicinity. Any thoughts on gaskets? I can't see anything in the parts catalogue.
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Singles / Re: B40 oil in timing case
« on: 03 April, 2018, 13:20:22 »
Yes I've had to play around with the pic as the file was too large. The pic was taken from the front as its not visible from the back, just the hole. It could be that someone has screwed in a brass screw to block the hole then broke off the shank?? Did they think it was letting oil in to the timing case rather than draining it away??
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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.
Secondly, there were no gaskets on the joints just goo. Is this correct?
Any thoughts would be welcome.
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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.
I've got my fingers crossed.
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Singles / Re: B40 head gasket
« on: 10 March, 2018, 14:20:04 »
Yes the gap on my B40 is around 38 thou so the thinner replacement gasket is no good for mine.
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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?
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Singles / Re: Valve guides
« on: 24 February, 2018, 14:30:40 »
Thanks for that. I heated the head first plus cooled the guide in the fridge and it went in fine. I've fitted a dozen or so guides in the past, mainly cars and never had a problem before. I wonder whether it may have been a defective guide. Anyway job done.
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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?
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Singles / Re: B40 Front Hub
« on: 14 October, 2017, 15:15:20 »
I'm all for sympathetic restoration but found quotes for rechroming quite ridiculous. Got a tip for Syd Smith in Sheffield who'll fit new rims and spokes as original at a sensible price so sent mine off last week.
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Singles / Re: b40 amal carb
« on: 02 October, 2017, 09:19:31 »
Yes 1". There seems to be a separate part, stamped '2' on mine possibly pressed into the body, which would make sense if they're producing a range of choke sizes. Someone may have tried to remove this in the past. I think my best bet is to start from scratch with a new carb, rather than refurbing the current one which will never perform as designed. Thanks again for your help.
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Singles / Re: b40 amal carb
« on: 01 October, 2017, 16:09:45 »
Many thanks for that. I now have a pile of bits on the bench, and looking at the parts I appear to have a mix of carb parts. Surprise surprise!
Do you know how to tell the difference between a 1" and 1 1/16" choke carb? ...and yes the throttle slide is worn.
Do you know how to tell the difference between a 1" and 1 1/16" choke carb? ...and yes the throttle slide is worn.
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