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post #1 of 9 Old Jan 18th, 2015, 2:37 pm Thread Starter
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clunk-a-klonk

Hi guys, a quick question, of late iron pig has developed an annoying habit of klunking at low to middle revs, itīs a solid "KLUNKCLONK" from out of the engines guts, and I can feel it a-KLUNK-a-CLONK-ing even through the handlebar.
Only every now and then and sometimes there is a short power loss before the pig carries on with a "who, ME?" as if nothing happened.
Should I be worried?

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post #2 of 9 Old Jan 22nd, 2015, 2:26 pm
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Re: clunk-a-klonk

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Originally Posted by Slammer View Post
Hi guys, a quick question, of late iron pig has developed an annoying habit of klunking at low to middle revs, itīs a solid "KLUNKCLONK" from out of the engines guts, and I can feel it a-KLUNK-a-CLONK-ing even through the handlebar.
Only every now and then and sometimes there is a short power loss before the pig carries on with a "who, ME?" as if nothing happened.
Should I be worried?
Hi, Ray - I guess there are 101 possible culprits that cause KLUNKCLONKING, butt I'll make one suggestion beyond the obvious check of plugs and wires --- bad load of petrol? I forget what the iron pig's model/yr is, but I would eliminate bad gas (not talking octane rating here) as a possibility by adding a fresh load. Hopefully, others will chime in with more positive suggestions. Good luck - hope it's an easy fix.
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post #3 of 9 Old Jan 22nd, 2015, 4:43 pm
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Re: clunk-a-klonk

Well you did not give much information, bike year and model, but I suspect your bike is slipping out of gear and back in. The dogs are worn and it is in need of a rebuild, exchange of a used unit or a new one . Someone in your area must work on these. Around here when this happens (K1200RS and the like and even the K1200S bikes) you can have the engagement dogs undercut by 3 degrees so they lock together when shifted into each other.
Anyway, time to evaluate value of the bike vs. cost of work on the transmission.
Generally this starts out happening, Klunk, in one gear like second.

Beech
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post #4 of 9 Old Jan 23rd, 2015, 12:50 pm
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Re: clunk-a-klonk

First thought would be driveline slack--might want to inspect the u-joints.

Of course a big engine miss can create that, too.

Kent Christensen
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'12 R1200RT, '02 R1100S, '84 R80G/S
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post #5 of 9 Old Jan 23rd, 2015, 1:09 pm
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Re: clunk-a-klonk

Here is a thread about a K1200S with the transmission Klunk:
k12s POP and sudden loss of power - I-BMW.com
I hope it turns out to be something easy to fix but I'm pessimistic on this one.

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post #6 of 9 Old Jan 24th, 2015, 11:52 am Thread Starter
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Re: clunk-a-klonk

Yeh I am a bit pessamistic too, it happens also when the bike is not moving, like at traffic lights, or in neutral, KLONK, then weeks without a KLONK, then five or ten KLONKīs in a row, the highr the revs the smoother the engine, by the way Iron pig is a 94 model LT1100.
If I let my fantasy run amuk I can imagine the crankshaft just dangling freely in the engineīs guts, it really has a solid metal on metal sound, what sound does a dud big end bearing make?

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post #7 of 9 Old Jan 24th, 2015, 11:59 am
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Re: clunk-a-klonk

Crank bearing knock is constant with RPM. You can't miss it. Once it starts it never goes away, just gets worse.

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post #8 of 9 Old Jan 24th, 2015, 3:41 pm Thread Starter
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Re: clunk-a-klonk

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Crank bearing knock is constant with RPM. You can't miss it. Once it starts it never goes away, just gets worse.
Hmmm! So much for that theory then...

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post #9 of 9 Old Jan 24th, 2015, 5:44 pm
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Re: clunk-a-klonk

At that age you may have spline issues at the back of the engine. Post over on BMWMOA and Paul Glaves will probably have a good idea what it may be.


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