Engine Rattle On Deceleration

Gerryk

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Riding for 22 Years
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georgia
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Gerry
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1998 Triumph Trophy 900
Background…’98 Trophy 900 with 57k miles (40k by me). Shamefully not a lot of maintenance done, besides regular oil changes a few carb tune ups, valve adjustments, and spark plugs. My mechanical demeanor is willing to attempt pretty much anything but I’m not experience/qualified to identify subtle problems. If it’s obviously broke/worn, I have a chance. Otherwise I’m a forum/YouTube lurker. And I have a Haynes manual.

Problem…motor noise on deceleration. I would describe it as chain jingling/rattling. I’ve removed the alternator. There was a little bit of play in the center so replaced the bolt and center. Did not fix the problem.

Next…I’m thinking it’s time to replace the cam chain and tensioner. I’ve removed the crank cover, and honestly I would say the cam chain and guides look good (to an uninformed novice). Part of me thinks it can’t be bad to replace the cam chain at 57k, regardless of its condition. Thoughts?

If I go through this whole cam chain business and it ends up not being the problem, I guess I would head for the sprag clutch. If you were in my position, would you do the sprag clutch too while it’s all apart? It seems like a whole other invasive project. Advice?

I appreciate any advice/encouragement
 

liebig

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Riding for 37 Years
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Dec 27, 2021
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57
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Sweden
First Name
liebig
My Ride
Triumph T'bird 1996 + a set of Ducati's
Background…’98 Trophy 900 with 57k miles (40k by me). Shamefully not a lot of maintenance done, besides regular oil changes a few carb tune ups, valve adjustments, and spark plugs. My mechanical demeanor is willing to attempt pretty much anything but I’m not experience/qualified to identify subtle problems. If it’s obviously broke/worn, I have a chance. Otherwise I’m a forum/YouTube lurker. And I have a Haynes manual.

Problem…motor noise on deceleration. I would describe it as chain jingling/rattling. I’ve removed the alternator. There was a little bit of play in the center so replaced the bolt and center. Did not fix the problem.

Next…I’m thinking it’s time to replace the cam chain and tensioner. I’ve removed the crank cover, and honestly I would say the cam chain and guides look good (to an uninformed novice). Part of me thinks it can’t be bad to replace the cam chain at 57k, regardless of its condition. Thoughts?

If I go through this whole cam chain business and it ends up not being the problem, I guess I would head for the sprag clutch. If you were in my position, would you do the sprag clutch too while it’s all apart? It seems like a whole other invasive project. Advice?

I appreciate any advice/encouragement
Found this when doing a bit of searching:
 

nickjaxe

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Riding for 7 Years
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England.
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Nick
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2020 T100 Bonnie.
What about the main drive chain....not sloppy is it?
 

Gerryk

New Member
Riding for 22 Years
Local time
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Apr 2, 2022
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georgia
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Gerry
My Ride
1998 Triumph Trophy 900
Found this when doing a bit of searching:
Liebig, thanks for the lead. I'll post my most recent suspicion in the thread below.
 

Gerryk

New Member
Riding for 22 Years
Local time
Today, 12:25
Joined
Apr 2, 2022
Messages
6
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Age
42
Location
georgia
First Name
Gerry
My Ride
1998 Triumph Trophy 900
What about the main drive chain....not sloppy is it?
I had that thought after I had taken off all the fairing bits and tank...and the main drive chain was good. I'll post my suspicions in the thread below.
 

Gerryk

New Member
Riding for 22 Years
Local time
Today, 12:25
Joined
Apr 2, 2022
Messages
6
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Age
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Location
georgia
First Name
Gerry
My Ride
1998 Triumph Trophy 900
So, after getting to the point of removing the cam cover and starting into the cam shafts (I had the intake shaft out), I discovered that one of the exhaust brackets that holds the pipe to the engine was completely off. The nuts were gone, and it was riding loose down on the pipe. I have to believe that this bracket loose on the pipe is the source of my 'jangling' noise (among other noises, I'm sure). I'm committed to a cam chain/tensioner/guide replacement, which at 57K miles is still probably not bad. The good news is the cam shafts and seats look good. Of course, it will give me the chance to check valve clearance, replace spark plugs, and air filter.
 

nickjaxe

Member
Riding for 7 Years
Local time
Today, 17:25
Joined
Dec 30, 2020
Messages
69
Points
7
Age
69
Location
England.
First Name
Nick
My Ride
2020 T100 Bonnie.
So, after getting to the point of removing the cam cover and starting into the cam shafts (I had the intake shaft out), I discovered that one of the exhaust brackets that holds the pipe to the engine was completely off. The nuts were gone, and it was riding loose down on the pipe. I have to believe that this bracket loose on the pipe is the source of my 'jangling' noise (among other noises, I'm sure). I'm committed to a cam chain/tensioner/guide replacement, which at 57K miles is still probably not bad. The good news is the cam shafts and seats look good. Of course, it will give me the chance to check valve clearance, replace spark plugs, and air filter.
Well done for getting to the bottom of it.
 
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