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June 18th, 2018, 05:37 AM   #101
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I Ride: HB 570 FE
9850 is quite high for 72mm stroke, Do a dyno run and inspect the graph to see whether its necessary to begin with. For a stock 570 its totally overkill with max power at 8500 or so (for example).
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June 18th, 2018, 11:41 PM   #102
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I Ride: when I can which isn't often enough. FX450, FE570
Weighed some pistons and pins

Std 570 piston assy including pin 371 gms

Wossner 362 gms

CP610 437 gms

Pins

Std pin 66 gms

CP pin 80 gms

The 610 piston in my Berg is then weighing 66 gms more than the OEM piston attached to the std crank. That’s the total weight of one std pin! Any wonder it vibrates!

Last edited by Alan; June 18th, 2018 at 11:45 PM.
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June 19th, 2018, 02:40 AM   #103
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I Ride: Two FE570 -12
I thought it was balanced for the 610?
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June 19th, 2018, 03:32 AM   #104
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I Ride: when I can which isn't often enough. FX450, FE570
Originally Posted by jon andersson View Post
I thought it was balanced for the 610?
I also received from Ola a balanced crank and spare CP piston kit both new unused so I can make another 610. I just need to get the spare cyl he gave me taken out to 104mm.
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June 19th, 2018, 09:31 PM   #105
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I Ride: when I can which isn't often enough. FX450, FE570
Titanium piston pin guys.

Where and how much?

Thanks guys.
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June 22nd, 2018, 03:43 AM   #106
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I Ride: when I can which isn't often enough. FX450, FE570
The OEM wrist pin is lighter than the CP pin supplied in the 610 kit for instance. The problem with the KTM pin is it’s $120.

I’m trying to get info on aftermarket pins without much success. Considering the importance of pin weight you’d think they’d list it.
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