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el__burro View Drop Down
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    Posted: 18 Jun 2025 at 18:27
Good afternoon,  
I am experiencing a very noisy engine. 
Mainly when warm and under stress.
The clunking noise coming from the engine is not valve gap related. 
I have checked that many times. 

Here is a short video. 
Any suggestions?

Thanks 
el__burro
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ranton_rambler View Drop Down
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Big end? You can get the caps off and look at the shells and crankpin once the sump is off.
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Chris950s View Drop Down
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It could be big ends, has the engine been leaking oil?
Chris and Karen - Essex
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Brian UK View Drop Down
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Sure it's not pre-detonation, knocking?
Brian.

Better 5 minutes late in this world than years early in the next.
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Dave P. View Drop Down
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So difficult to tell from a video. Could be a loose valve guide or small end/big end bearings. You're going to have to get on there and have a look. You appear to have only two warning lights, is one of them oil pressure and does it go out when you start the engine?

Edited by Dave P. - 20 Jun 2025 at 11:42
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

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Mike H View Drop Down
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The red light does go out, but could be for battery charging. (?)
"Chicken nuggets don't dance on a Tuesday."
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Dave P. View Drop Down
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It could indeed. I'd be looking to do an oil pressure check.
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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el__burro View Drop Down
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Points: 499 		Post Options Post Options   Thanks (0) Thanks(0)   Quote el__burro Quote  Post ReplyReply Direct Link To This Post Posted: 21 Jun 2025 at 09:40
Thank you all for your replies and sorry for nor responding sooner.
The 2 lights on my dash are GEN and N. I check oil level regularly and that is at level. 
Yes, the engine has oil on it but i cannot  see any on the floor though.
Would I tackle this from the top (remove cylinders) or bottom (remove sump)?
Is there a good mechanic in  London I could take the bike to?

Thanks 
el__burro
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Chris950s View Drop Down
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There is Baldrick in SW London, a very fine chap Thumbs Up
Chris and Karen - Essex
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Mike H View Drop Down
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.
"Chicken nuggets don't dance on a Tuesday."
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el__burro View Drop Down
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Points: 499 		Post Options Post Options   Thanks (0) Thanks(0)   Quote el__burro Quote  Post ReplyReply Direct Link To This Post Posted: 13 Jul 2025 at 14:22
How difficult could this job be?
I have no ramp.

Thanks 
el__burro
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Dave P. View Drop Down
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Have you decided where to look first? You don't actually need a ramp, everything can be tackled with the bike on the floor. A bike lift of some sort is very nice to have but it's not a necessity. Make sure you have a kneeling pad!!
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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ranton_rambler View Drop Down
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If you’re wanting to drop the sump and look at the big ends it will be do-able without a lift, but you’ll be lying on the floor I think.
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Mike H View Drop Down
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Yes this is certainly do-able. Actually should be able to take everything out leaving just crankshaft behind, with crankcase still in the frame.

With sump off it should be possible to pull and push the big ends, in theory.
"Chicken nuggets don't dance on a Tuesday."
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Guzzished View Drop Down
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Many Many long years ago my brother came to the conclusion that his BSA Lightening had duff crank bearings and stripped the engine completely to later discover it was actually his back mudguard rattling at a certain rev/resonance. 
OuchOUCH!!!
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