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#695602 - 05/08/11 09:59 PM Knocking from cold start
gateway guy Offline
Newer Member

Registered: 12/04/09
Posts: 10
When I start my 09 RT from completely cold I hear a knocking from the right cylinder that goes away in about 30 seconds. I adjusted the valves over the winter and all was quiet until about a week ago. Is this something to be concerned about.

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#695609 - 05/08/11 10:35 PM Re: Knocking from cold start [Re: gateway guy]
Sailorlite Offline
Member

Registered: 05/15/06
Posts: 648
Loc: So. Calif.
GG - I hear what might be the same clatter on cold starts, but if I pull in the clutch lever the clatter stops. Not sure what that's all about but my conclusion is that it's not really an engine-related noise.
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#695643 - 05/09/11 06:33 AM Re: Knocking from cold start [Re: gateway guy]
gateway guy Offline
Newer Member

Registered: 12/04/09
Posts: 10
I get that clutch noise too,but this seems to come from the right cylinder area, more engine related.
Thanks

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#695647 - 05/09/11 06:52 AM Re: Knocking from cold start [Re: gateway guy]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 8285
Loc: Ohio
Originally Posted By: gateway guy
When I start my 09 RT from completely cold I hear a knocking from the right cylinder that goes away in about 30 seconds. I adjusted the valves over the winter and all was quiet until about a week ago. Is this something to be concerned about.



Morning gateway guy

Yes, I would be just a bit concerned about it until it is identified. If just a chain slap due to tensioner bleed down then no problems. On the other hand if something more serious then it should be addressed.

Problem with identifying engine noises over the internet is we canít hear them.

We either need you to become our ears and explain the noise exactly in frequency, intensity, position, reaction. Or you might need to get the bike to someone that has the background & experience to help you identify the noise.

Maybe try an oil change to see if new oil with a thicker base will change the noise.

Also maybe buy a cheap mechanics stethoscope then remove the stinger and end diaphragm so you just have an open hose, then listen to different engine areas on cold start to try & identify the area of the engine the noise is coming from.


Also try starting the engine clutch pulled in, clutch out, clutch in and trans in gear (kickstand up) , etc to see if you can effect the noise.

I can tell you for experience that tracking down an engine noise that only appears at starting is difficult enough if leaning over the engine and all but impossible from a long distance.
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#695658 - 05/09/11 07:52 AM Re: Knocking from cold start [Re: gateway guy]
workin them angels Offline
Member

Registered: 12/13/08
Posts: 780
Loc: Indiana
Mine gets what I would call a tapping from time to time on the right side at idle. It's intermittent - and mostly does not do it. If i shut off and restart, it's gone. I recorded it one time. no one really seemed to be all that concerned about it. Valves are fine. It wouldn't do it for the dealer when it was in.
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#695707 - 05/09/11 11:19 AM Re: Knocking from cold start [Re: gateway guy]
RichardSpag Offline
Member

Registered: 08/03/05
Posts: 96
Loc: Surrey, UK
Gateway guy,

If its any consolation, my 1200rt has been making knocking sounds from cold (on the right hand side) over the last 98,000 miles. I would just get on with riding it if I were you. I thinks it's caused by what used to be called "BMW character".

Cheers

Richard


Edited by RichardSpag (05/09/11 11:20 AM)
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#695746 - 05/09/11 02:39 PM Re: Knocking from cold start [Re: gateway guy]
Don_Eilenberger Offline
Member

Registered: 08/07/06
Posts: 1123
Loc: Spring Lk, NJ, USA
Ditto on Richard's comment.

It's chain slap. Why the right-hand side is a mystery to me.. the oilheads used to do it on the left side because the oil could drain out of the cam-chain tensioner on that side. The fix on the oilheads was to install an R1200 tensioner (they're interchangeable..)

Mebbe the fix on the R1200 engine is to install an R1150 tensioner (just - sorta - kidding..) I have heard of people that cured it by replacing the tensioner, but I've also never heard of anyone having a problem caused by it, so I'm ignoring mine. It only does it at a cold startup (after sitting for 30 minutes or more) and it only does it for a few seconds, so I'm working on forgeddingaboutit.. smile
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BMWs: '07 R1200R Roadster, '01 M-Coupe; Porsche: '06 Cayenne S; Lexus: '11 RX-350
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#695758 - 05/09/11 03:23 PM Re: Knocking from cold start [Re: gateway guy]
dirtrider Offline
The Oracle
Member

Registered: 06/05/10
Posts: 8285
Loc: Ohio
Afternoon Don


If you are sure it is the R/H tensioner try shimming the spring with a small washer under the spring. That spring is only in there to keep the tensioner inflated when the engine stops. Having the engine stop with valve spring tension on the chain makes it even worse.

While I havenít done it to the 1200 hexhead I have shimmed the R/H side on some oilheads with R/H side morning chain rattle with pretty good success.
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#696043 - 05/10/11 01:15 PM Re: Knocking from cold start [Re: dirtrider]
bobbybob Offline
Member

Registered: 02/02/07
Posts: 2356
Loc: Charlotte, NC
My '07 RT makes the same knocking sound but it stops when I pull the clutch in (in neutral). Goes away after about 2 mins of running. Seems clutch related....

Edit: and now my '10 GS has started making the same sound on cold starts. Didn't use to but now have 8K miles on it--guess things are loosening up.


Edited by bobbybob (05/10/11 01:17 PM)
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