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Old 1 Aug 2014
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F650 GS wired engine noise going uphill

Hi all

Got a slowly growing problem that I'd like to fix prior to riding through Kazakhstan....

It's been slowly getting worse over the past 2000 miles or so.... you know that noise old cars make when tryig to pull off in too high a gear? A sort of metallic ratteling or pinging.

My bike started doing this when I am goig uphill. First only in the high gears, when it was quite low rps for the speed I was going and the gradient of hill I was going up. So just selecting a lower gear did the trick.

But now it seems to get worse and its as if the bike just doesn't have the power to go up normal hills at normal speeds. It always makes that horrid noise when it struggles and sometines even 1st gear isn't low enough!

(I know it should go up those hills at those speeds just fine, because it used to, and because Aidan's exact same bike is doing it fine, without nises.)

So at first we thought valve clearaces? No, just checked, they are fine.

The chain tensiones also seems to be working fine and pushes in ess than 9mm (the allowed limit), so as far as I know the camchain is tight enough. It also looks undamaged.

I thought maybe the clutch plates were gone, hence the loss of power. But I am told that wouldn't cause any noises, the bike just struggles to pull. Is that true?

I am at a loss as to what the problem could be ad what to check. Any ideas would be much appreciated!
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Old 2 Aug 2014
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Piston slap. Time for an oversize piston.
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Old 2 Aug 2014
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Wow at 36000 miles? That seems like a giant job How far can I ride with such a problem and what am I breaking by not fixing it now?
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Old 2 Aug 2014
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Is it continuous, or just when under load?? My first thought if you're off the beaten track is crap fuel causing severe ''pinking'', even fuel starvation due to a blocked fuel filter.Maybe even water in the fuel. First place to start for me is changing the fuel and perhaps finding some octane booster.
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Old 2 Aug 2014
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No, not continuous. Just when under load/working hard going up hill (both on smooth tamac oron crap roads).
First heard it happen in Greece. Now in Georgia (via Turkey) so lots of fuel changes in between. Over tie it has been happening more and more.
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Old 2 Aug 2014
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Quote:
Originally Posted by luckyluke84 View Post
Wow at 36000 miles? That seems like a giant job How far can I ride with such a problem and what am I breaking by not fixing it now?
Seems to be a perennial BMW big single problem. My new Sertao with 2,500 miles on the clock even does it - the noise that is, but not yet the power loss.

As for damaging the engine, ultimately the piston will shatter but I don't think that is imminent for you. As for being a giant job, not at all. I have twice torn down and rebuilt motors in a hotel room during my international travels - once 36 years ago after having both pistons shatter and lock the motor in the main street of Nairobi.
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