BSA Owners' Club Workshop Discussions

The BSA Workshop => Twins => Topic started by: pockets on 12 Jul, 2022, 18:23

Title: A65 Primary noise
Post by: pockets on 12 Jul, 2022, 18:23
Any idea what this could be, there seems to be enough gap   between rotor and stator , have tightened the chain tension , there is some wear on the clutch tangs and cage . https://www.youtube.com/watch?v=PgG2BBcFrjE
Title: Re: A65 Primary noise
Post by: ChrisG on 12 Jul, 2022, 20:34
If you mean the 'whistling' sound that is quite normal. I put it down to the primary chain running over the tensioner. With the cover on it's more of a humming sound.
Title: Re: A65 Primary noise
Post by: pockets on 12 Jul, 2022, 20:50
its more than a whistling sound , its  a quite  pronounced load chattering.
Title: Re: A65 Primary noise
Post by: pockets on 12 Jul, 2022, 23:22
Is there anyone  with  mechanical experience of  working on classic  bikes willing to perhaps come have a look at it for some advice who live  near Newbury Berkshire ?
Title: Re: A65 Primary noise
Post by: Spaceman on 13 Jul, 2022, 06:39
I can't really make out an unusual sound from the video but the thing that strikes me from watching it is the amount of flexing in the upper run of the the primary chain. Intuitively, I would have expected there to be relatively little flex although I can't say I have ever watched an engine running of this type with the chaincase removed to definitely say whether this is normal or not. I assume the chain has been tensioned to provide about 1/8" of free play in the top run?

However, I would be happy to pop in for a cup of tea and have a listen - when you say you live near Newbury, how many miles N, S, E or W from the centre of town?
Title: Re: A65 Primary noise
Post by: pockets on 13 Jul, 2022, 10:44
 Thanks spaceman , Iv'e private messaged you .
Title: Re: A65 Primary noise
Post by: Mike Farmer on 13 Jul, 2022, 10:52
 :) :) :)

Sounds a bit "Slack chain" to me----but

Mike 8) 8) 8)
Title: Re: A65 Primary noise
Post by: pockets on 13 Jul, 2022, 11:35
Ive adjusted the chain it was quite a lot slacker before and the sound hasn't altered , seems about right now . just wondering whether the chains worn out , its at the limit on tensioner .   Also does the drive sprocket seems quite worn ?
(https://live.staticflickr.com/65535/52213339571_f5775de3a0_c.jpg) (https://flic.kr/p/2nxV1LB)IMG_20220708_171410504_HDR (https://flic.kr/p/2nxV1LB)
Title: Re: A65 Primary noise
Post by: ChrisG on 13 Jul, 2022, 11:40
I was just thinking the same thing. If the chain is knackered, when tightened, the rollers will not sit properly in the outer start and finish teeth on the sprockets and that will definitely be noisy.
Title: Re: A65 Primary noise
Post by: B Murphy on 13 Jul, 2022, 14:48
Let us know what you find but for me I would buy a new chain for starters. I can definitely hear the clattering in the video.
Title: Re: A65 Primary noise
Post by: pockets on 13 Jul, 2022, 16:12
The thing is its not my bike, am recommisioning it for my brother inlaw, has not been used much in the 7yrs He's had it and not at all for1 1/2 years needed  a good sorting to get  running with carb overhaul and gaskets ,fuel lines, filters and  replacement oil lines , Hes selling it but could do with at least knowing what the issue is or sorting it before it gets sold.
Title: Re: A65 Primary noise
Post by: B Murphy on 13 Jul, 2022, 16:37
Yes agree, at least a new chain installed would eliminate it. Never know, when you take the clutch and geny off you might find the problem noise, but my guess is it'll be the chain. Please keep us all posted on your findings as it's great when things like this get sorted.
Title: Re: A65 Primary noise
Post by: chaz on 13 Jul, 2022, 17:30
Im looking at the crankshaft sprocket teeth, seem a little too pointed for my liking, would like to see a bit of land on top..
If its going to be sold, priced right there will be movement for the buyer who will probably want to  get his spanners out anyway.
not expecting a low mileage superbike would they,
Title: Re: A65 Primary noise
Post by: pockets on 13 Jul, 2022, 19:36
Thats a fair point , just would be nice to rectify for an easier  and best price sale , but I may well just put the  covers back on and get it up for sale .
Title: Re: A65 Primary noise
Post by: pockets on 13 Jul, 2022, 19:41
Hi Spaceman , did you get my message, doesnt show it as sent when  I  checked .
Title: Re: A65 Primary noise
Post by: Spaceman on 13 Jul, 2022, 19:43
I was about to reply!!

Before you put the covers back on, I would be happy to pop in and listen to the engine to see if there is anything to worry about. Obviously, if it making a strange sound (I couldn't hear one in the video!), that might put buyers off? Best time for me would be Sunday pm if you can wait that long?
Title: Re: A65 Primary noise
Post by: B Murphy on 13 Jul, 2022, 20:27
Changed my mind about the chain and think it sounds more like bearing grind.
Title: Re: A65 Primary noise
Post by: pockets on 13 Jul, 2022, 20:51
Thanks Spaceman , checked my messages and doesnt show that I've sent  or received , strange . yes sundays good with me , can you confirm that you got my message ,then  I  can go ahead and pm you with details of address etc.
Title: Re: A65 Primary noise
Post by: pockets on 13 Jul, 2022, 22:03
https://www.youtube.com/watch?v=wExfiI6AXtc another vid
Title: Re: A65 Primary noise
Post by: Spaceman on 14 Jul, 2022, 06:29
Quote from: pockets on 13 Jul, 2022, 20:51
Thanks Spaceman , checked my messages and doesnt show that I've sent  or received , strange . yes sundays good with me , can you confirm that you got my message ,then  I  can go ahead and pm you with details of address etc.
Yes - received the pm ok - please send address and should be there by, say, 2 pm.
Title: Re: A65 Primary noise
Post by: Spaceman on 14 Jul, 2022, 08:30
Quote from: pockets on 13 Jul, 2022, 22:03
https://www.youtube.com/watch?v=wExfiI6AXtc another vid
Looking at the new video and the chain tensioner in particular, I'm not sure whether the adjusting screw is standard and I'm not sure whether or not it is showing an excessive amount of adjustment indicating the primary chain is very badly worn?
Title: Re: A65 Primary noise
Post by: Spaceman on 14 Jul, 2022, 08:48
On reflection, I think the adjuster is ok - for some reason, I thought this was a later motor (like mine) which has a slightly different adjuster.
Title: Re: A65 Primary noise
Post by: B Murphy on 14 Jul, 2022, 09:38
Is there no change in noise when you pull the clutch lever.
Title: Re: A65 Primary noise
Post by: pockets on 14 Jul, 2022, 11:18
Doesnt appear to be , yes the tensioner pad is quite low  that probably doesnt help the adjustment but doesnt seem to be worn right through , I am leaning towards chain and front spocket wear .
Title: Re: A65 Primary noise
Post by: pockets on 14 Jul, 2022, 14:22
PMD you Spaceman , cheers