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January 19th, 2009, 08:11 AM   #11
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you can run a cast iron linar thinner than niksasil. also despite the fact that the piston potentially can have a smaller running clearance with the nikasil - THEY DON'T! finaly, the husaberg pistons run hardened chrome rings which are better suited to an iron sleeve than the hard v hard of chrome on nikasil.
agree with swedish, and yes i did poin this out 6 months ago. i described how langcourt's of the UK said that there was too much distortion in the linars. it's particxularly bd on the 450/470i believe.

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January 19th, 2009, 08:30 AM   #12
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Is the distortion due to the manufacturing process or after a period of use (abuse).

How about cryoing a new liner before installation?
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January 19th, 2009, 10:05 AM   #13
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the piston on the shorter stroke motors is trying to pull the front bottom and push the back top out of the linar. short rod, revs etc.

th aluminiul is abit toooooo thin. of course you have to add in the owners and what they are dong to the engines as well......

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December 9th, 2017, 08:25 PM   #14
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Ok, I know..old thread.
But has anyone done a 102mm piston on their 550?
That would effectively bring it to 590cc right.
Sounds like an interesting idea for my 07.

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December 10th, 2017, 04:15 AM   #15
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Hi Pollo

tis indeed an old thread! where did you find it?

I have had oversize 650 liners made in alloy with success and have a production piston which is cheap enough. I also have Head gaskets. (103.5mm ID).

nothing in 550 but I'm having batches of 450 replacement liners made and slipping a 550 liner in there wouldn't be a problem.

we designed the liners so that we measure dimensions from the ends and so the rim is measured from the top but the O ring grooves are measured from the bottom. it means we simply 'open' the middle to alter the height of the liner from 450 to 550 to 650.

easy-peasy-lemon squeezy!!!

Taffy
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December 10th, 2017, 08:24 AM   #16
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I did a search for 102mm piston and found the thread.
I remember someone saying the old 600 was like the 550 but with more beans.
So inquired out of curiosity.
My 550 just ticked over 120hrs and running great, but when the time comes I
could very well be interested in making it a 590.
Especially if it was going to be a rare build. I think it could be an awesome motor.

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December 11th, 2017, 01:43 AM   #17
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why not make a packer and turn it into a 650?

650 crank, 650 rod, 650 liner, 650 CCTB, 650 camchain, unfortunately you'd need a 650 piston (dished). all from bits on the shelf. probably all you need to make is the packer and a card base gasket for the packer.

I have the packer design here. I've made one just 9mm thick for my long stroke motor but again, we designed it to be stretched. i think at about 40mm thick it would be stable as well.

just some ideas. if you ever make the 590 you'll need a flat or dished piston. it won't be domed so the thermals in it should be excellent.

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December 11th, 2017, 05:29 AM   #18
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I was thinking 590 because I already have my 06 650.
And may do something with that someday as well. The guy that won the Mackay grasstree beach race on his 650 has a 102 piston with I believe 82 crank at 670cc. That sounds good.

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December 11th, 2017, 05:56 AM   #19
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are you on about the Aussie? mmm/ I know he has 82mm stroke but didn't know he has 102mm bore.

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December 11th, 2017, 06:41 AM   #20
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Yes, I happened to talk with him in a group and he told me about it..

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