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19-03-2020, 10:21 PM | #1 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
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Anybody have a clapping sound
Ducati Monster 900 1997
Took the old girl out , was off the road since October, New oil, new starter solenoid to replace the oe plug type with a cable and I wired in a superseal connector, should fix the intermittent starting issues Not too sure if I am imagining things, she runs great, loads of torque low down , makes all the right sounds down low to mid rev, no power loss When I seem to go mid rev, especially top end ; she makes a clapping sound, similar to those clappers you had on your bmx as a kid, from what I remember she had a throaty sound up top too with pops and bangs on over run, It's hard to do a wot pull with traffic but I think power drops off when this happens, maybe a misfire up top? |
20-03-2020, 01:25 AM | #2 |
Too much time on my hands member
Join Date: Jan 2013
Location: Shipbourne
Bike: M900
Posts: 1,422
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If you have messed with the wiring in that area you may have disturbed the coil connections, or the fact of just standing means possible corrosion on them which may not be allowing full current at higher revs. Worth a check.
My next port of call would be the earth leads to the frame. Followed by plug leads and possibly new plugs. If it persists I would find a bit of road where you can replicate the issue for 30 seconds or so, hold it at those revs and cut the engine dead and check the plugs to find out which cylinder is misbehaving |
20-03-2020, 12:17 PM | #3 |
Registered User
Join Date: Jan 2014
Location: Newbury
Bike: Multiple Monsters
Posts: 366
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No guidance on the electrics I’m afraid but my 900 had serious pops and bangs on overrun... Turned out to be a cracked clamp on the front cylinder exhaust header was letting air in.
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20-03-2020, 12:56 PM | #4 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,084
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Cylinder head studs; has one snapped?
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
20-03-2020, 01:05 PM | #5 | |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,554
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Irrespective of any possible loss of performance, I would be investigating the clapping sound as a matter of urgency.
Until that was diagnosed I would be reluctant to ride the bike at all. Quote:
But still, that was one of the things I was going to suggest investigating as a possible cause for the clapping sound. I might also check for leaks at the cylinder head joint. In that case I would be fretting that a cylinder stud had snapped .. apparently a fairly common thing if you have the shiny, silver studs instead of the stronger black ones. (edit .. as Darren suggested while I was typing). Maybe even a loose spark plug ? Also out of paranoia as much as anything, I would pop the belt covers off and check that a half-failed (or perhaps very loose) belt wasn't flapping against the belt covers. Can't think of much else to suggest. Its odd that this should suddenly happen after a period off the road. Its tempting to think that it might be related to the work you have done on the bike during that time, but I can't really see how a new starter solenoid would be the cause of a clapping sound. An issue with the starter sprag maybe ? .. I have no personal experience to offer there. |
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20-03-2020, 04:07 PM | #6 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,935
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I would agree with every thing that Utopia has said and you would do well to take his advice and check the belts asap.
Regarding an exhaust leak; while they do let exhaust out, any leaks near the manifold seem to let air in also and it's this that makes all the pops and crackles. I think the noise could be consistent with a blowing head joint (no gasket afaik) and possible snapped stud! Years ago the head gasket blew on one of my Ajays and I suppose you could describe the noise as a clapping sound. It was very loud and present at all revs, I guess the volume would depend on the size of the blow and the throttle setting. I have also had spark plugs blow out following a weird "clapping" sort of sound (I assumed tampering in that case. It was a Yamaha YDS7) A friend of mine once had a mysterious top end tapping sound on his Fire Blade, that many of us listened to and failed to diagnose.. He had it stripped at a shop and they discovered loose spark plugs (after the strip!). Noughties triumph triples also suffer from a bizarre squeaking sound caused by slightly loose exhaust manifolds.. If you imagine the sound you make blowing through a blade of grass trapped between your thumbs, it's like that. So in general I think that air or gas escaping through a thin gap under pressure could well be the culprit, but please do check those belts first..
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20-03-2020, 05:29 PM | #7 |
Too much time on my hands member
Join Date: Jan 2013
Location: Shipbourne
Bike: M900
Posts: 1,422
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Surely a blown gasket/broken stud would make a noise whatever the revs, similarly a belt loose (personally I would check that anyway as others have recommended)?
If it is rev related then its either coil or carburetor with my money on the coil/ plug/plug leads. It is difficult to diagnose without hearing the sound |
20-03-2020, 10:13 PM | #8 |
aka Phil
Join Date: Nov 2005
Location: derry
Bike: M900
Posts: 376
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I had a clapping noise on mine after it was layed up for a few months. I changed the chain and sprockets (unrelatd to the noise) and it's smooth as ever now. I suspect there were a few tight spots on the chain going into a flap at a certain revs of the wheel/ chain. Just a thought
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22-03-2020, 05:01 PM | #9 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
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Thanks ,
Bike has Termi's on there and K&N panel Filter(OE airbox) for a few years now, she had a rear puncture so the rear wheel was off but torqued back up to spec and axel markers have not moved Spark plugs are March 2018 NGK DCR8EIX (3606) - Iridium IX Spark Plug Checked
To Check
Questions
Spark plugs : March 2018 NGK DCR8EIX (3606) - Iridium IX Spark Plug Top Head Lower Head (Near front wheel) Earth |
22-03-2020, 05:10 PM | #10 |
Transmaniacon MOC
Join Date: Sep 2013
Location: Sutton In Ashfield
Bike: Multiple Monsters
Posts: 6,084
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If you can move any of the cylinder head nuts by hand or they are loose then one is probably broken. Most likely to be the rear ones.
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Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage |
22-03-2020, 05:32 PM | #11 |
Registered User
Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
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The iridium plugs require a larger gap than on standard plugs. The thin centre electrode means that, if you use the standard gap (0.7mm?), you won't get a fat enough spark. Aim for about 1.0mm.
There's more information here (posts #4 & #12) http://www.ukmonster.co.uk/monster/s...hlight=iridium |
22-03-2020, 05:42 PM | #12 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
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Thanks for the spark plug info was looking for it
One head studs is broke , top stud behind the oil cooler |
22-03-2020, 05:50 PM | #13 |
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Join Date: Aug 2011
Location: Southampton
Bike: M1100evo
Posts: 2,465
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22-03-2020, 05:58 PM | #14 |
Bronze Member
Join Date: Nov 2014
Location: Hondon de los Frailes
Bike: S4r
Posts: 290
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Bad news about the head stud, if you are lucky it won't have sheared flush (I wasn't that lucky - if I fell in a barrel of tits I'd come out sucking my thumb) it's not that bad a job to replace the head studs, leave the pistons in the barrels when stripping down - it's much easier that way.
Good luck. |
22-03-2020, 05:58 PM | #15 |
Registered User
Join Date: Aug 2019
Location: Swansea
Bike: M620ie
Posts: 15
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The plugs in the pics do not look like iridium, more like standard, should have a tiny electrode. edit someone beat me to it while typing, does confirm the plugs hope you weren't charged for iridium
Last edited by Graham04; 22-03-2020 at 06:00 PM.. |
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