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B40 rattles/grinds under acceleration #773968
05/17/19 2:31 am
05/17/19 2:31 am
Joined: Jun 2018
Posts: 15
Salt Lake City, UT
L
LandoLando Offline OP
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LandoLando  Offline OP
BritBike Forum member
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Joined: Jun 2018
Posts: 15
Salt Lake City, UT
My 1964 B40 (its got a a 62 motor in it with the points on top of the case) started making an awful noise on a short ride last week, and I've since parked it and begun dismantling it. The noise sounds like the gears are throwing a loose bolt or other hardware inside the primary. So I pulled the primary cover and everything looked fine. I pulled of the pressure plate and the clutch nut was still installed underneath and the clutch fingers looked tight in the grooves on the ID of the clutch ring. I haven't dismantled the clutch any further, because I am waiting on the extractor tool.

Because I wasn't sure that the problem was with the clutch, I decided to peek inside the inner cover. Nothing out of place there either. Any idea what could be causing such a terrible racket?


Last edited by LandoLando; 05/17/19 2:33 am.
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Re: B40 rattles/grinds under acceleration [Re: LandoLando] #774015
05/17/19 5:35 pm
05/17/19 5:35 pm
Joined: Oct 2008
Posts: 1,693
Canada
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LarryLebel Offline
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LarryLebel  Offline
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Joined: Oct 2008
Posts: 1,693
Canada
I had a similar rattling sound on my B44R which turned out to be a loose alternator nut.

Re: B40 rattles/grinds under acceleration [Re: LandoLando] #774168
05/19/19 8:03 am
05/19/19 8:03 am
Joined: May 2004
Posts: 4,017
Sydney Australia
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BSA_WM20 Online content
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BSA_WM20  Online Content
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Joined: May 2004
Posts: 4,017
Sydney Australia
Remove the chain tensioner and take it for a short run.
They can be really noisy.
Some glue/rivet rubber / nylon / teflon on the working face to quieten them down.
Apparently cheap thin chopping boards work reallly well, unless she catches you cutting her nice new board into thin strips.


Bike Beesa
Trevor
Re: B40 rattles/grinds under acceleration [Re: LandoLando] #774200
05/19/19 5:02 pm
05/19/19 5:02 pm
Joined: Feb 2014
Posts: 1,272
Lancaster, California
C.B.S Offline

Parts Dealer
C.B.S  Offline

Parts Dealer

Joined: Feb 2014
Posts: 1,272
Lancaster, California
I agree with the above but will add more info as I just finished a C15 and a B40

The primary chain has to be adjusted properly. I have found (even on A50 / A65) that a loose primary chain will cause all kinds or rattling noise, especially under load or acceleration

Does the noise tend to go away over a period of time? - perhaps piston slap

The only thing that can get loose is a rotor nut or a main-shaft nut. (also also the inner hub of your rotor)

Grab the rotor nut with a vice-clamp and rock back and forth and perhaps up and down

You can remove your primary cover and start the bike, make sure all the oil is removed and cleaned prior, perhaps that will help you isolate the sound


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