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November 13th, 2018, 01:29 AM   #31
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I don't think you are crazy but if the weight is more than about 340gm you will have a hard time selling them imho
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November 13th, 2018, 02:16 AM   #32
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Bushmechanic what are your thoughts on just plonking in 570 104mm piston? They are under 340g they are available to buy singular as opposed to 10 or more.
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November 13th, 2018, 02:49 AM   #33
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I can weigh a Wossner 570 piston/kit and/or the 104mm CP. im sure the CP is up near the 340g mark. Way over constructed and a heavy pin.
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November 13th, 2018, 07:16 AM   #34
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Hi Polska.

Haven’t been on here for a long time but seen your post over on the HAS page.

I’d be interested in at least 1, if not 2 of these pistons. I have both 644 and 628 engines but would be happy with both of them at 24.5mm CH if I do the 2.

Yes weight will be a factor for me too but I’ll follow this thread for now and see what eventuates. I think if you really want longevity, reciprocating mass should be at a minimum especially with the bigger valves and carb. But I also realise it’s not easy to have everything!

On a side note, I was reading that my KTM 1090 Adventure R has 103mm pistons. Would love to compare dimensions of these to our Husa ones to see if they are doable....

Welcome to pm me if needed

Regards

Damo
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November 13th, 2018, 08:22 AM   #35
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...And it appears that the 1190 uses a 105mm piston! And it may even use a 20mm wrist pin!

Last edited by thorgan; November 13th, 2018 at 08:44 AM.
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November 13th, 2018, 09:34 AM   #36
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Originally Posted by thorgan View Post
...And it appears that the 1190 uses a 105mm piston! And it may even use a 20mm wrist pin!
Maybe it would fit? Don't know. But quck search showed $350 each! And no asymmetrical design.
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November 13th, 2018, 10:36 AM   #37
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1190 piston top of pin bore to top of piston 15.9mm.according to a friendly eBay seller that measured for me.as opposed 14.5 needed for 628.
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November 13th, 2018, 01:44 PM   #38
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Incidentally, has anyone else noticed that the 628’s displacement is exactly 2 pi deciliters? Kind of funny. Metric humor?
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November 14th, 2018, 04:45 AM   #39
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Originally Posted by 76model View Post
Bushmechanic what are your thoughts on just plonking in 570 104mm piston? They are under 340g they are available to buy singular as opposed to 10 or more.
That's a good idea except the piston crown might not be ideal for the old engines head and stroke , ie compression ratio valve placement and squish band shape. Pictures, actual weight and dish volume etc would be useful but I'm about to hop on a plane will check later.
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November 14th, 2018, 08:57 AM   #40
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Idea to check 1190 valve angles aswell, Id expect them to be less which may present a problem or not, no idea how much piston to valve clearance the 650/628 has to offer.
Edit: Probably what Bushie is saying. Just thinking out loud you know
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