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June 18th, 2018, 06:37 AM   #101
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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 19th, 2018, 12:41 AM   #102
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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 19th, 2018 at 12:45 AM.
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June 19th, 2018, 03:40 AM   #103
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I thought it was balanced for the 610?
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June 19th, 2018, 04:32 AM   #104
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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, 10:31 PM   #105
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Titanium piston pin guys.

Where and how much?

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June 22nd, 2018, 04:43 AM   #106
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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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August 15th, 2018, 02:10 AM   #107
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ThumperRacing head then Berglund head.


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August 15th, 2018, 04:34 AM   #108
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As comparison my head. Former owner told me he bought it from a supermoto team in CZ.
Big Bores for 70 degrees-cz.jpg
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August 15th, 2018, 09:43 AM   #109
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Its very hard to see from a pic whats going on, different camera, what wide angle, light and so on.
What is clear is the oem head wont flow well enough, so for a 570 at least and a big bore for sure the head needs addressing to make use of the top end.
Ill see if I can find the flow chart of the head FP-engineering did for me.

Flowing a head is far from an absolute truth when it comes to power, however its helpful for some things. brb!
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August 15th, 2018, 01:25 PM   #110
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I saw you were discussing the heads on FB, Im not a fan of FB, so Ill write my few lines I have here. All in my humble findings.

Mototune is a joke right, its just bullshit all of it, I have actually tried that crap and built stuff and dynoed in the noughties, it is that old yes. The idea is pretty good but wont work in reality.

What you want to do that works is aiming at an intake stream around 300 feet per second at the valve stem, which will be your max speed, that sets the minimum diameter of your port, just a tad over 30mm from memory on the 570 aiming at 70hp. I used vanniks softy to get in the ballpark, which matched FP's work.

After the stem part you need to slow the speed down to up pressure by introducing a bowl to fit (bernoullis principle) , this combination is the culprit plus the seat cuts, along with enough stack length to keep air velocity adding on to the pressure. Cam timing on top of this!
How the ports look to the human eye is of no importance, its just a selling feel good point, it can be really rough un-round and not shiny no worries
Ask the engine
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Last edited by TomTom; August 15th, 2018 at 02:48 PM.
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