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.If not then what is your suggestion for an aftermarket piston?
- Joined
- Oct 30, 2003
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- 955
- Location
- Sweden
I've been using the old 470-piston (with crown) which gives around 12,7:1. That worked just fine with the adjustments you can do with turning the SEM-stator, and normal 98 octane unleaded fuel. From appr. 13,5:1 and onwards, you will need to adjust/programme the ignition out of the range possible with OEM system. The ELKO-piston (2004?) runs very smooth and revs happily, even with the #53 cam. It doesn't provide so much mid range power or reliability, but smooth power delivery can be just as good!
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
IMHO the 470 is a poor piston, it also has no squish and misses the head by a mile. far better the 450 piston from later husabergs 2004-2008 because it has a domed piston like the 470 but the edge of the piston is 1.6mm higher giving you enough room to machine the perfect squish. I should mention that depending on which batch of wossner 470 pistons you get, the heights can vary immensley. up to 0.6mm variation is what i've found.
I suggest that with your present engine, you remove the head and measure the squish gap and then strip the engine and measure the distance from over the GP ends to the top edge of the piston with great accuracy. you are then ready to buy the piston and measure it, and machine it to what you want it to be.
In the meantime, i do do a HC piston for the 2004-2008 650s: http://cgi.ebay.co.uk/Husaberg-Wossner- ... _978wt_732
regards
Taffy
I suggest that with your present engine, you remove the head and measure the squish gap and then strip the engine and measure the distance from over the GP ends to the top edge of the piston with great accuracy. you are then ready to buy the piston and measure it, and machine it to what you want it to be.
In the meantime, i do do a HC piston for the 2004-2008 650s: http://cgi.ebay.co.uk/Husaberg-Wossner- ... _978wt_732
regards
Taffy
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i just bought the '03 crank(the one with the two big holes) because it is stronger than my old one('04 32mm big end) so i don't know what hc piston to use now, my old piston was an elko. i saw somewhere in here than the '03 piston is a good choice, what is your opinion?
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
johnyberg said:
but the cranks are the same? the 2001 to 2004 (inclusive) cranks are all; circular flywheel (360 d), 32mm big end? only in the second year of the new engine = 2005, did they go to the pork chop, short-stroke, 35mm big end crank.
so surely you have bought the same again?
if you have a pork chop crank? you have a 35mm big end. this is the stronger crank. according to the repair manual, they fitted the dished mahle from 2004 onwards which means that for 2004 it was old crank, new cases and new piston.
2001-2002 = 82mm stroke crank, c/w 32mm big end, weaker 134mm c-to-c rod, old flat piston, old cases for SEM ignition. squish is 3 - 3.5mm
2003 = 82mm stroke crank, c/w 32mm big end, weaker rod, weaker 135 c-to-c rod, old flat piston, old cases for SEM ignition. squish is 2 - 2.5mm
2004 = 82mm stroke crank, c/w 32mm big end, weaker rod,mahle dished piston taller by 1.6mm, newer cases with kokusan ignition. squish is close to spot on at 1mm.
2005 - 2008 = 80mm stroke (pork chop) crank, 35mm big end, strong 135 c-to-c rod, mahle dished piston, kok. ign. cases, squish back to 2mm or so (i think!).
there, couldn't make it any clearer!
i have explained the difference in piston heights but perhaps not an approx squish gap. you must check the rod lengths from the tuning section of the doc. you can only get the longer 135mm centre to centre rod for the 32mm big end now as they discontinued the earlier one.
regards
Taffy
- Joined
- Jun 13, 2007
- Messages
- 3,871
- Location
- south east WA Australia
on my 08 with the OEM elko/mahle piston the squish is whatever the headgasket is when compressed 1.25 - 1.4mm they seem to vary a bit.
that crank without the holes looks like a 550 crank with the hole for the pin bored out further
camchain has 72pins ?
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
i'll try and study these squishes more closely as i rebuild these engines but it doesn't help when there are different height wossners fitted all over the show.
everyone is welcome to add to this thread if they know what they have...
regards
Taffy
everyone is welcome to add to this thread if they know what they have...
regards
Taffy
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