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Originally Posted by Burga007
Hi Stuart, thanks for that information. I need to get a copy of that book - have the pages you posted all come from "DW Munro's 1960 7th edition book" that you referred to in a previous post?......
Hi Burga,
Only the first two pages came from DW Munro's book. The last page I printed out from somewhere, don't remember where.
Here's what you are looking for. It is a useful little book.
[Linked Image from i.postimg.cc]


Originally Posted by Burga007
Neil, I've just reviewed the data......and the cam numbers in the table correspond to 'Sand Racing' or 'Road Racing' type A Cam. So, if I'm reading things correctly, type A cams should have .001" valve clearence, yes?
I realize I'm repeating what Neil wrote but yes, .001" would be correct for those numbers. BUT, the cams could have been reground. It's worth mentioning since it does have the racing cam numbers in it. I apologize for not mentioning it earlier and if this just adds to the confusion.

One way to know is to inspect the cams closely for signs of re-work ie welding or freshly ground looking wear surfaces, non original (Original was a blued finish) surface finish to the gear, OR, other numbers engraved on it.

Another way is to dive into the technical details and use a degree wheel to identify the cams opening and closing events. You can also observe the base circle (Slight travel on a dial indicator while the valve is closed) for any sign of quietening ramps.

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Here's a link to one on Ebay. Probably an earlier version.


https://www.ebay.com/itm/2040540712...Nm&widget_ver=artemis&media=COPY

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One rider: measuring the cams with a degree wheel, even allowing the 0.018" checking clearance, is likely to result in confusion: I checked many cams (25 years ago though!), very carefully, when picking a set for my road-racer and NONE came close to the factory numbers. This is not a new thing with BSA cams...


No generalisation is wholly true, not even this one.
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Thanks for the info Stuart. And thanks to everyone for their input to this thread. The good news is, I set the corret valve clearence and the bike sounds really sweet. It runs and rides really well. I couldn't have done it without you!!

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Originally Posted by Burga007
.....The good news is, I set the correct valve clearance and the bike sounds really sweet. It runs and rides really well. .......
Glad to hear it all worked out. Even these simple old things can be a real puzzle at times.

How'd you like using a .001" feeler gauge on those lifters if you even have one? .0015" is as small as most feeler gauge sets go. Imho, it's a real pain. But you can set them to where the push rod is just free to rotate and then go another 1/32 of a turn looser which is .0012" but unfortunately that usually changes on you when the jam nut is snugged up.

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Hi Stuart, well, it took me absolutely ages to get it 'right'. Fiddly is not the word! Time and time again I got it where I thought the gap was right only for it to be massive or none existent once I'd nipped up the lock nut. I ended up grinding a couple of old spanners to give me more room to work with. You're right, my feeler gauge only goes to .0015". I'm hoping I got it right, the bike sounds better than it ever has done. I'll check the gap again to ensure it's correct in a few miles.

Just gotta find the time to ride it now.......my family keep wanting to spend time with me....do they not understand I just want to ride my bikes?! ;o)

Seriously though, thanks again, my knowledge has come on leaps and bounds as a result of this process. It is appreciated.

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Originally Posted by Burga007
Hi Stuart, well, it took me absolutely ages to get it 'right'. Fiddly is not the word! Time and time again I got it where I thought the gap was right only for it to be massive or none existent once I'd nipped up the lock nut. I ended up grinding a couple of old spanners to give me more room to work with. You're right, my feeler gauge only goes to .0015". I'm hoping I got it right, the bike sounds better than it ever has done. I'll check the gap again to ensure it's correct in a few miles.

Just gotta find the time to ride it now.......my family keep wanting to spend time with me....do they not understand I just want to ride my bikes?! ;o)

Seriously though, thanks again, my knowledge has come on leaps and bounds as a result of this process. It is appreciated.

I've been using mine for daily ride to work in this nice weather. Bit of a faff getting the leathers off and on but having tested boots, gloves and leathers before I have to stick to my rules re protective gear!

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