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May 23rd, 2021, 01:03 AM   #1
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04 husaberg 650 headgasket issue

Hello!

Upgraded my top end with new valve springs etc, now Im trying to fit the new head gasket, but every time I try the gasket leaks water out the exhaust and in the engine case, cant find any issues with the top or bottom, no cracks or anything, old and new gasket are the same too.
Bike ran fine without any leaks before I removed it.

Anyone has any opinions on this? Is there something Im
Missing?

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May 23rd, 2021, 01:41 AM   #2
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I'm worried for you because it might just be that the liner has cracked.

you need to remove the cylinder head and look 8mm down the bore for a hairline croack running around the bore 8mm from the top.

I really hope not.

PM me regarding HGs.

cheers

Taffy
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Last edited by Taffy; May 24th, 2021 at 07:34 AM.
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May 24th, 2021, 06:32 AM   #3
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Liner is fued

Found a crack all around..

Bike ran fine before this, what could cause it and whats my options now?
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May 24th, 2021, 07:37 AM   #4
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Nobody really knows. so you are saying that you never split the engine, you just took the head off? this is the first time I've heard of this? normally, mechanics have split the engine and this means; "what did they touch?"

not you though. https://www.facebook.com/17856704226...91027014355621

have a look at this video.

cheers

Taffy
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May 24th, 2021, 08:02 AM   #5
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Just took off the top, mounted new springs etc, mounted back on and water seeped trough

Bike ran fine previous season with no signs of water, changed oil every 10 hours so I would’ve noticed..

So new liner and piston then��
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May 25th, 2021, 12:59 AM   #6
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Which head gasket did you use?
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May 25th, 2021, 01:23 AM   #7
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If you didn't use OEM... Go on reading the forums on FB.
Lots of cracked liners.
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May 25th, 2021, 10:53 AM   #8
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Originally Posted by jojo09 View Post
If you didn't use OEM... Go on reading the forums on FB.
Lots of cracked liners.
Oh really!

well, I go on the Swedish and the Australian Husaberg forums and don't see lots. I have customers contact me who don't use forums with 450 2004s but rarely anything else. This is the first I've seen without the engine being split which tells me a lot.

what does it tell you?

Taffy
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May 26th, 2021, 09:19 AM   #9
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Could loosening the head bolts completely 1 at a time rather than gradually all 4 together create a break in the liner?
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May 26th, 2021, 09:42 AM   #10
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Why should loosening the bolts create a crack?
It's the torque when mounting the head that cracks the liner.
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