UK Monster Owners Club Forum » .: Technical :. » Engines, Clutch, Gears » Monster S4 clutch noise

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Old 17-07-2019, 06:07 PM   #16
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check the link i posted above, there’s a similar discussion on that thread, along with extracts from manual

ps. the search function is excellent, “stack height” produced 35 results
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Old 18-07-2019, 03:55 PM   #17
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I think I'll order a dished plate then as there is nothing in the stack like that on my bike, at least the stack height seems right. All the non-friction drive plates are identical (being perfectly flat) from what I can tell. I'll strip it down again on the weekend and get the calipers on the plates to check the thickness and if need be, I'll order a new set of the non-friction drive plates as well. I'm taking it out tonight so I'll see if it's still noisy or not after a good clean and a new top hat fitted. Cheers for the info guys
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Old 18-07-2019, 04:39 PM   #18
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I believe the dished plate(s) are meant to reduce grabbiness/promote smooth action, so I wouldn’t worry too much about it if all is well after cleaning the dust out and your test ride.
If the clutch isn’t slipping or dragging and you can find neutral ok, the stack height is fine.
It’s quite common to have trouble finding neutral at a standstill until you’ve put a few miles on a new pack of plates.
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Old 18-07-2019, 06:27 PM   #19
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Yea i wouldnt worry too much about dished plates although they are supposed to from what ive researched recently reduce noise its mostly during take uo. According to the info my slipper is supposed to have 2 dished plates, one at each end of the stack but im pretty sure it just has one as per standard setup and clutch works fine and fairly quiet too.
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Old 25-07-2019, 12:23 PM   #20
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Quick update, the noise is still there. I have cleaned everything, replaced the push rod, top hat and pressure plate bearing. As soon as the bike hits 3500rpm it starts and stops around the 4k mark. High pitched wah wah bloody wah. It's doing my head right in, its that sort of rev range that you have when you are just coming into town or pottering in low gears through traffic. I'm used to people looking at me like my bike is broken but this is taking the pi$$. I don't know what else to try. At the moment I have a non-standard pressure plate with one of those star shaped spring retainers so I guess I could try changing all that back to the factory plate and spring cups. For a change, the rest of the bike is running really sweet so this is taking the jam out of my doughnut.
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Old 26-07-2019, 10:33 AM   #21
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While I was out riding last night, I had a thought. As I can't really do any static rev-testing at home (neighbours and the noise only happens when the bike is warm) I was wondering if it is actually the clutch making that noise. Previously to stop the noise, I have either pulled the clutch lever in or changed gear to avoid that exact rev-range but last night as I was going along I pulled the clutch lever in and revved the bike to hit the 3.5k - 4k rev range and the noise appeared, I also noticed it at a higher rev range too which is new and slightly worrying. I know the clutch will still spin but its not loaded or being driven etc but it made me think, what if the noise is from something else on that side of the bike such as a cam belt tensioner or something. Do they make a noise when they are on the way out? is there anything else on that side of the bike that could make this high pitched whining noise? or am I just clutching at straws here....
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Old 26-07-2019, 07:50 PM   #22
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So it might not be the clutch after all? I would pull the clutch out and then take a listen. You will be able to to hear more clearly where the noise is coming from. Could be a belt tensioner or cam bearing. With the clutch ckateet removed you should be able to tell.
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Old 28-07-2019, 07:30 PM   #23
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The trouble is that it only happens when the engine is hot and they cool down pretty bloody quick. The thing that is worrying me is that I did a bit of googling (not always a good thing, I know) and I came across a post on a usa forum where they were talking about noise coming from the main output shaft bearing. That got me worried. I then read about belt tensioner bearings making a noise when they are on the way out. If I had the spare cash I'd love to take it to a Ducati specialist and just let them loose on it, but I'm not exactly flush at the moment. If I knew it wasn't something serious, that would be a weight off my shoulders but as it stands, I'm none the wiser. I'm not sure running it without the clutch in will get it up to temp or not, it would have to sit running for a fair while. I'll try and replicate it tomorrow with the clutch in to see if it makes the noise or not. If it does I'll strip it and report back. Otherwise I'll have to bite the bullet and Moto-r in Ruthin might be the next step.
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Old 28-07-2019, 08:32 PM   #24
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First call would be to check the belt tension, then whilst in there also spin the tensioner bearings and have a feel to see if they are rough or loose.

If you're not confident enough to adjust the tension...and it really is very easy... then just running the bike with the covers off for while might give a better indication of the source of the noise.

This sounds similar to the noise problem that afflicted some 1100's when the vertical belts were too tight.
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Old 30-07-2019, 03:17 PM   #25
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Well I've just ran the bike for over 20 mins, once it was warm I periodically revved it to 4k to see if I got any noise. Other than a slightly increased whine while revving it. The wah wah ringing noise didn't appear. I'm ordering a new set of belt tensioner bearings today, I don't know how long they have been on the bike so feck it, it won't hurt to put some new jobbies on the old girl. Once they have arrived and are fitted I'll triple check the belt tensions and report back. Bloody thing lol. At least the noise drowns out my mate taking the **** with his trouble free £800 Honda cbf 600. At least mine's got soul and personality.....*cough* #sadface *cough*
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Old 07-08-2019, 08:46 AM   #26
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I was talking to an owner of a 400ss at the weekend. He bought the bike very cheaply because of an "engine noise" the shop were unable to cure. His description of the noise was identical to what you are describing. The cause? A worn cam belt tensioner bearing.

Hope your problem is as easy to fix.
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Old 08-08-2019, 03:44 PM   #27
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Happy update time!

I have replaced the cam belt tensioner bearings (moving and static) and checked the belt tension (vertical belt was tighter than horizontal but not overly tight) and the problem seems to have gone away!

I'm well chuffed fair play! I really thought it was the clutch and after I'd stripped that down and the sound was still there, I had a horrible feeling it was the main output bearing or something more serious.

It wasn't without issue though, I spoke to my usual Ducati dealership and was told that Ducati no longer supply the bearings, they can't get them anymore apparently. I panicked for a bit then remembered I have a shop in my town called 'Bearing man' (I kid you not) I rang them expecting to be told they don't do automotive stuff and the guy was like "Yeah mate, we've got over 100 in stock" he was really knowledgeable on the phone and when I read out the code on the bearing's I'd removed, he told me what the different letters meant etc, confirmed that they were high speed/temp bearings and as a further bonus they were only £8 each, bloody bargain!

The Horizontal bearings were easy to fit but the vertical cylinder was a right pain to change, in the end I had to find a short 19mm socket, grind two flats on either side so a 22mm spanner would go on it to remove the tensioner stud and backing plate off the block just to enable me to get the old one out and the new one in. Right pain in the backside. I'll update the post later to show the bearing numbers etc in case someone else with an S4 needs bearings and they don't want to spend £40 a pair on ebay prices. I'm a bit disappointed with Ducati, I know its not a new bike but they could of been a bit more helpful.

Thanks to everyone that made suggestions, I now have a bike that sounds fantastic again instead of a police siren on helium everytime I hit 3500 rpm.

Cheers guys
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Old 08-08-2019, 04:12 PM   #28
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Quote:
Originally Posted by desmo dreaming View Post
i'll update the post later to show the bearing numbers etc in case someone else with an s4 needs bearings
6003-2rs C3 ?
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