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post #1 of 11 Old 07-25-2013, 1:07 PM Thread Starter
 
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moderate rattle on overrun

After a particularly hard thrash today on my 929 I noticed a rattle coming from right side of engine. It does it at all revs but only when decelerating. Nothing unusual when on the power and a very slight rattle when cruising at the speed limit. Quite loud as soon as you take your hand off the throttle. I rode it home 20 miles at granddad speeds and it didn't get worse.

I'm thinking cam chain tensioner or possible something to do with the clutch.

I'll take the cover off over the weekend but are there any common faults I should be looking to first?
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post #2 of 11 Old 07-25-2013, 2:04 PM
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Re: moderate rattle on overrun

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Originally Posted by slopster View Post
After a particularly hard thrash today on my 929 I noticed a rattle coming from right side of engine. It does it at all revs but only when decelerating. Nothing unusual when on the power and a very slight rattle when cruising at the speed limit. Quite loud as soon as you take your hand off the throttle. I rode it home 20 miles at granddad speeds and it didn't get worse.

I'm thinking cam chain tensioner or possible something to do with the clutch.

I'll take the cover off over the weekend but are there any common faults I should be looking to first?

I'd be looking at the camchain and/or the tensioner.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #3 of 11 Old 08-02-2013, 5:44 PM Thread Starter
 
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Re: moderate rattle on overrun

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I'd be looking at the camchain and/or the tensioner.
What's to look at on the cam chain? I got the tensioner off, tested it put it back on reset it but problem still remains. Oil pump chain looks quite loose but maybe that's normal? Deff been keeping eye on oil press light and it seems ok. Any more ideas?
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post #4 of 11 Old 08-02-2013, 6:57 PM
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Re: moderate rattle on overrun

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Originally Posted by slopster View Post
What's to look at on the cam chain? I got the tensioner off, tested it put it back on reset it but problem still remains. Oil pump chain looks quite loose but maybe that's normal? Deff been keeping eye on oil press light and it seems ok. Any more ideas?

When you have the tensioner off, put it back in the hole fully extended and press it firmly against the chain. You want to see at least a couple millimeters gap between the tensioner and the crankcase.
Yes, the oil pump chain does run very loose.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #5 of 11 Old 08-05-2013, 2:46 AM Thread Starter
 
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Re: moderate rattle on overrun

Yep theres a good 5 or 6mm gap when fully extended. Makes it pretty hard to get back in winding it up with a half screwdriver while tightening the bolts all right next to the frame...
Anyway not quite sure where to look next...
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post #6 of 11 Old 08-05-2013, 3:14 AM
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Re: moderate rattle on overrun

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Originally Posted by slopster View Post
Yep theres a good 5 or 6mm gap when fully extended. Makes it pretty hard to get back in winding it up with a half screwdriver while tightening the bolts all right next to the frame...
Anyway not quite sure where to look next...
Give your drivechain a check for slack, on decel sometimes they can slap the chain slider if its out of adjustment. A dry chain will make even more noise, if it makes the noise you describe only while riding, not stationary of course. . And now that I have only one eye open I realize you said right side of engine. Oh well, still good advice to anyone who bothers to read this far. I'm tired. lol
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post #7 of 11 Old 08-05-2013, 5:54 AM Thread Starter
 
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Re: moderate rattle on overrun

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Give your drivechain a check for slack, on decel sometimes they can slap the chain slider if its out of adjustment. A dry chain will make even more noise, if it makes the noise you describe only while riding, not stationary of course. . And now that I have only one eye open I realize you said right side of engine. Oh well, still good advice to anyone who bothers to read this far. I'm tired. lol
Nice thought but it happens while stationary as well Could it be one of the plastic cam chain guides? They look a bit hard to get at though
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post #8 of 11 Old 08-05-2013, 6:42 AM
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Re: moderate rattle on overrun

I'm getting a kick out of all the people who are talking about cam chain noise. I'm very familiar with these sc28 engines, but it was when they came out and they never had cam chain noise. I had an 87 hurricane 600 with the hydraulically adjusted chain tensioner. The adjuster was replaced multiple times because the small oil orifice would get clogged. I always remeber that sound to be very distinct. It was a blattant "rattle". Back in my day (relatively speaking) the 900's never had enough miles on them to go through cct's or their sliders. Even still, if the tensioner is good, I would imagine that the guides (sliders) are ok as well. I have to get used to the idea that the original 893's came out 20 years ago. I'm doing my best to deal with that........I should expect most of them still on the road will have some miles on them. Even the 929 is gonna be 14 next year. I feel old. Anyway sorry for the dissertation on my sad life, hopefully we can get this sorted out.
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post #9 of 11 Old 08-05-2013, 7:05 AM Thread Starter
 
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Re: moderate rattle on overrun

Mines only done 20000km so any fault is likely to be the 14 years rather then the milage. Rebuilt it last year with new bearings and rings and second hand block last year (due to cracking the block in an small but unfortunate accident).
Just mentioning that because I've only done 600km since the rebuild and it could be my own shoddy workmanship coming back to bite me now if I've forgotten to tighten something...was running really well up until last week!
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post #10 of 11 Old 08-05-2013, 7:23 AM
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Re: moderate rattle on overrun

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Originally Posted by slopster View Post
Mines only done 20000km so any fault is likely to be the 14 years rather then the milage. Rebuilt it last year with new bearings and rings and second hand block last year (due to cracking the block in an small but unfortunate accident).
Just mentioning that because I've only done 600km since the rebuild and it could be my own shoddy workmanship coming back to bite me now if I've forgotten to tighten something...was running really well up until last week!

What do you mean by the "block"?
Did you replace the crankcases as a set?

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post #11 of 11 Old 08-05-2013, 7:54 AM Thread Starter
 
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Re: moderate rattle on overrun

Yes both crankcases as a matching set. Bearings as per coding on the cases and crank and checked with plastiguage
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