Bang and Strange Noises during Starting

cathulu · 05-23-2012, 10:04 PM

Usually my bike starts fine. But occasionally I get bangs and knocks and sometimes other unusual noises during starting. It does not sound right, like something is hitting something in the engine, maybe a gear or something. The kind of knock that you get when downshifting at a stop is the closest thing it reminds me of. Happens maybe one time in twenty.

Anybody else notice this? Should I be worried?

I don't seem to recall this when I got the bike. Got about 18,000 km.

Mollygrubber · 05-25-2012, 04:09 PM

Mine has about 20,000 miles at the moment. I never hear this noise. I would take it in asap if you're still under warranty. If not, I'd probably ignore it and hope it went away.

Loutre · 05-26-2012, 01:31 AM

Quote:

Originally Posted by Mollygrubber

Mine has about 20,000 miles at the moment. I never hear this noise. I would take it in asap if you're still under warranty. If not, I'd probably ignore it and hope it went away.

FredRydr · 05-26-2012, 03:47 AM

I never had the starter out in my F800GS, but based upon what you've written, I'd be checking whether the starter is engaging properly. If the bike is under warranty, shift the burden onto BMW for the expensive diagnosis and repair.

Let us know what it was.

Still, it would be cool to ignore it and see where it leads. Imagine the noise getting louder and louder until one day, in the wilderness, BANG! And then...silence.

Fred

mapuda · 05-26-2012, 08:53 AM

Mine has almost 42K miles and I have never heard a banging noise. Get it checked out at the dealer.

Nacho911 · 05-26-2012, 10:53 AM

I hope the bang is not from your gun
While you take a man's bike
and the noise you hear is someone screaming at you after you start it and ride away

I hope this is not the reason

cathulu · 07-29-2012, 06:50 AM

Just an update in case anyone else comes across this problem... the dealer diagnosed that it was the cam chain tensioner. Just got it replaced.

Sent from my GT-I9100M using Tapatalk 2

cathulu · 09-22-2012, 10:28 AM

It is back intermittently- definitely the cam chain tensioner. Loosens off and the cam chain slaps and bangs during the occasional start. Nobody else has had problems and resolved satisfactorily? Will have to go back to the dealer. Hope it is not something in the cylinder head that has worn so that a new tensioner will not work 100 percent of the time.

Sent from my GT-I9100M using Tapatalk 2

JRWooden · 09-22-2012, 02:22 PM

Also, I think that Joel said a tool/gauge existed that could be inserted into the bore in the cylinder head where the camchain tensioner assembly usually sits, that could give a readout on how much wear was present in the system ... I would ask service manager if they have this tool ...

05-23-2012, 10:04 PM	#1
cathulu ^OP Gnarly Adventurer Joined: Jan 2010 Oddometer: 174	Bang and Strange Noises during Starting Usually my bike starts fine. But occasionally I get bangs and knocks and sometimes other unusual noises during starting. It does not sound right, like something is hitting something in the engine, maybe a gear or something. The kind of knock that you get when downshifting at a stop is the closest thing it reminds me of. Happens maybe one time in twenty. Anybody else notice this? Should I be worried? I don't seem to recall this when I got the bike. Got about 18,000 km.

05-25-2012, 04:09 PM	#2
Mollygrubber Eschew obfuscation Joined: Feb 2010 Location: Vancouver, BC Oddometer: 1,063	Mine has about 20,000 miles at the moment. I never hear this noise. I would take it in asap if you're still under warranty. If not, I'd probably ignore it and hope it went away. __________________ "What you damn kids need is a right good war" - my father

05-26-2012, 08:53 AM	#5
mapuda Crash Tested Joined: Apr 2007 Location: Las Vegas, NV Oddometer: 243	Mine has almost 42K miles and I have never heard a banging noise. Get it checked out at the dealer. __________________ Good judgement comes from experience. Experience comes from bad judgement.

05-26-2012, 10:53 AM	#6
Nacho911 Gnarly Adventurer Joined: Sep 2009 Location: Alberta Rocky Mountains Canada Oddometer: 366	I hope the bang is not from your gun While you take a man's bike and the noise you hear is someone screaming at you after you start it and ride away I hope this is not the reason __________________ Nacho911

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05-26-2012, 03:47 AM	#4
FredRydr Danger: Keep Back 500 Ft. Joined: Aug 2005 Location: South-Central Pennsylvania USA Oddometer: 997	I never had the starter out in my F800GS, but based upon what you've written, I'd be checking whether the starter is engaging properly. If the bike is under warranty, shift the burden onto BMW for the expensive diagnosis and repair. Let us know what it was. Still, it would be cool to ignore it and see where it leads. Imagine the noise getting louder and louder until one day, in the wilderness, BANG! And then...silence. Fred

07-29-2012, 06:50 AM	#7
cathulu ^OP Gnarly Adventurer Joined: Jan 2010 Oddometer: 174	Just an update in case anyone else comes across this problem... the dealer diagnosed that it was the cam chain tensioner. Just got it replaced. Sent from my GT-I9100M using Tapatalk 2

09-22-2012, 10:28 AM	#8
cathulu ^OP Gnarly Adventurer Joined: Jan 2010 Oddometer: 174	It is back intermittently- definitely the cam chain tensioner. Loosens off and the cam chain slaps and bangs during the occasional start. Nobody else has had problems and resolved satisfactorily? Will have to go back to the dealer. Hope it is not something in the cylinder head that has worn so that a new tensioner will not work 100 percent of the time. Sent from my GT-I9100M using Tapatalk 2

09-22-2012, 02:22 PM	#9
JRWooden Beastly Adventurer Joined: Jul 2008 Location: The great state of confusion Oddometer: 3,438	Also, I think that Joel said a tool/gauge existed that could be inserted into the bore in the cylinder head where the camchain tensioner assembly usually sits, that could give a readout on how much wear was present in the system ... I would ask service manager if they have this tool ...