Long stroke vs short stroke 650 ID

Vegard · Sep 24, 2013

I've got a 2005 650, but it might be manufactured in 2004.
I know I could measure the stroke, but a bit difficult to measure 2mm difference when it's all in bits.

The crank pin is 35mm.

What have I got??

CaptainRedline · Sep 27, 2013

The one on the left is the 32mm big end 644cc crank, one on the right is the later model "pork chop" crank with the 35mm big end pin which is the shorter stroke 628cc. Very easy to identify just by the shape of the crank

Vegard · May 2, 2014

That means I have the manly crank

Which date was the change?

bushmechanic · May 2, 2014

2004 but the currrent part number starts in 2005

If I recall correctly there is a transition crank with the full circle webs like yours that also has a 35mm pin and an 80mm stroke

looks like you have an ELKO piston 24.5mm from pin center to top so its probably an 80mm crank.

if you have a kokusan ignition its also likely to be the feminine 80mm stroke just with big chunky thighs

bushmechanic · May 2, 2014

this is the more common version of the 82mm stroke 32mm pin crank

3605d1391862474-balancing-80mm-650-crank-crank-side.jpg

so are there are 2 kinds of 80mm /35mm cranks ? (full circle and pork chop) I thought there was only 1

definately 2 kinds of 82mm / 32mm cranks ( both full circle but most of them have the lightening holes drilled in)

35mm pin = 80mm stroke
32mm pin = 82mm stroke

Vegard · May 6, 2014

bushmechanic said:
2004 but the currrent part number starts in 2005

If I recall correctly there is a transition crank with the full circle webs like yours that also has a 35mm pin and an 80mm stroke

looks like you have an ELKO piston 24.5mm from pin center to top so its probably an 80mm crank.

if you have a kokusan ignition its also likely to be the feminine 80mm stroke just with big chunky thighs

Is this of any help?

You were right about the piston

bushmechanic · May 7, 2014

thats a kokusan,

Im pretty certain you have the feminine crank but with chunky thighs

you got an angle grinder ?

http://husaberg.org/mechanical/17329-balancing-80mm-650-crank.html

Taffy · May 7, 2014

the 2001-3 644 with 82mm stroke has a fully circular pair of flywheels and a 32mm big end with two big balancer holes near the big end.

the 2004 644 with 82mm stroke has fully circular flywheels TO LOOK AT FROM THE OUTSIDE with NO BALANCER HOLES, however, look from the ends and you can see that it is pork chop on the inside half of each flywheel. it has a 32mm big end still.

the 2005-8 628 has a pork chop crank with a 35mm big end.

regards

Taffy

bushmechanic · May 7, 2014

so vegard are you still sure its a 35mm pin ?

35mm pin = 80mm stroke

32mm pin = 82

kokusan + 32mm pin = 2004 82mm stroke

toivias · May 10, 2014

2004 650, kokusan ignition.
Can someone tell me what piston is this?
is it possible that it is a piston from 570?!

bushmechanic · May 10, 2014

since it has 8737 on the top its probably a

wossner 8737D C (listed for the 570)

approx 278gms
99.97 diam
20mm pin 60gms
comp height 24.5mm
dish volume -10.5cc

can interchange with the OEM elko 628 and

pro-x PN# 01.6606.A (or B or C bigger ones)

A: Diameter: 99.95mm

B: Total height: 41.20mm

C: Pin size: 20.00mm

D: Compression height: 14.50mm

G:Boss Space: 23.00mm

2 Lube holes in oil groove

Weight piston: 275gr.

Weight pin: 70gr

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Long stroke vs short stroke 650 ID

Vegard

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Vegard

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