Another tapping topic-sorry

[BSA500]

Ok to start a list of what has been fixed/done to pre answer some replies 

1.Crank shaft reground and new big end shells
2. small end bearings checked and one replaced
3. reshimmed crank (2 thou)
4. New primary chain
5. valve clearances checked and set (8/10 thou)
6. All mounting bolts tightened

So now to the issue always tapping just like a to wide valve clearence esp at tickover. When accelerating sounds like small knocking but not. Can hear it as the power comes in then not as I go faster(could be masked by wind noise etc). No increase in vibration beyond the norm as in say a worn big end. Not a small end as I had that last year and it was horrible.
 Took the timing side apart and took off the dynamo chain no change in noise. Levered the crank no movement. No movement in idler pinion. Removed front valve cover no increase in noise.
 Ran over the engine with the screwdriver test and when put onto the rocker feed bolt for the exhaust feed the tapping could be heard/felt. So I am leaning towards cam/followers is there anything I missed??
many thanks Andy

[bsa-bill]

just something that can be checked very quickly, slacken the three larger (front) primary case screws, they can (but shouldn't) sometimes reach the crank - not very likely but an easy one to eliminate

[BSA500]

Worth a try 

[duTch]

 

  just something that can be checked very quickly, slacken the three larger (front) primary case screws, they can (but shouldn't) sometimes reach the crank - not very likely but an easy one to eliminate 

 One of the two inner case screws can do the same- but not so easy to check

[BSA500]

Well no change there. Doesn't sound like screws rubbig on the crank a definate tapping. I took a video on my phone I will try to send it to this topic.

[trevinoz]

It's not piston slap, is it?
What clearance do you have in your bores?

[BSA500]

Sorry didn't include in my list she had a rebore in the last couple of years and everything looked fine in spring when I took it down to do the crank.
She has horrible pinking but I can't  get the atu off due to the extract bolt not extracting,So I can't rule that out yet.

[duTch]

 

She has horrible pinking but I can't  get the atu off due to the extract bolt not extracting,So I can't rule that out yet.

 Someone else had the same issue not long ago- if you do a search it may shed some lights (not many puns intended if there was any-except the ones I intended-if there was any)

[BSA500]

Found that thread(I started it )

[Greybeard]

If you look back a month or so you will see that I had a horrible knocking that was a badly worn cam follower. I'd been adjusting the tappets and obviously taking out the slack but the follower was through its hardening and was rapidly wearing, opening the clearance.

Here's a link:
https://www.a7a10.net/forum/index.php?topic=13318.60

[BSA500]

Yes I remember your continuous bad luck like mine I must have had the bottom end down four times in the last two years.
It is something to check if it seems I have to take it down again. I haven't touched the cam etc for years it always 'looked fine. Strange the knocking noise is more obvious with the crash helmet on. With it off(Sorry officer) it sound  horribly rattlerly and with the exhaust covered not too bad???????

[duTch]

 

Found that thread(I started it )

 So is it stuck/broken again ? The thread I had in mind had a successful outcome and I think Beezamacc supplied a new gear

[BSA500]

I did have it fixed and I thought it was ok until I tried to remove it and it's not coming off again.

[BSA500]

I post so many problems I lose track🤣🤣

[BSA500]

Ok plan of action. After 21st Oct( I want to go to the Offham village meet cars and bikes) then I will try to remove the atu and retime the engine to exclude the pinking.
Then if that does not improve things when she is off road for winter I will start a gradual strip down checking everything in minute detail.