Knocking 390 -10

swoch · Mar 19, 2012

I had a bad experience with my 390 berg hit a rock or something hard. The really bad part is that i didn't noticed it before i began to hear a knocking sound from it. It was a hole in the clutch cover and the oil had dissaper.

After a new clutch cover and a service of the berg i started the bike but the knocking is still there. What do you all think it could be? The knocking increases with the revs. I'm prepared for the worst case 8O

Taffy · Mar 20, 2012

a shaft is bent I suspect. either way the shop should really have found it while the bike was in there.

regards

Taffy

swoch · Mar 20, 2012

Ok, sorry for not being clear. I made a simple service my self, oil and filter change. I have not had it in the shop.

Thanks!

husadan · Mar 20, 2012

Hey mate bad luck,i would say a big end bearing,no oil spells disaster.

swoch · Apr 2, 2012

Story continues! Good and bad.

I have take the motor apart totally, everything looks good exept the valve clearance on exhaust side that had increased by 0,15 over the limit. Could that have happent when the engine run without oil? And could that be the reason for the knocking? And how can the valve clerance increase? The valves looks good as far that i can see.

Davo · Apr 2, 2012

Could the Rocker be worn as per the picture in the 70 degree valve check/adjustment

Page 5 and the post is by user "Motoroche"

I thought if the valve clearance was an issue it would be more of a louder "ticking" noise rather than a "knock". Just a guess could be wrong

swoch · Apr 2, 2012

Thanks, gonna check that rocker arm.

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Knocking 390 -10

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