2004-2006 650 engine differences?
- Thread starter canolman
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Joined Mar 2006
254 Posts | 83+
SO.NV.
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
Joined Sep 2013
369 Posts | 209+
canolbarth cymru
I've got my eye on a '06 with uprated mains and dual valve springs. We can't agree on the price though!
Not sure whether to throw some money at my '04, spring kit, big bore or big bore and "refresh" the '06:unsure:
Hmmm:unsure:
Not sure whether to throw some money at my '04, spring kit, big bore or big bore and "refresh" the '06:unsure:
Hmmm:unsure:
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
Joined Sep 2007
782 Posts | 291+
???
" really big valves "
Dr C made a head where he moved the inlet valves centres apart.
I think all information was lost on the web at some stage.
It might be nice to run the 570 titanium 39.9mm inlet valves in the 628
but it would require some post valve porting and the moving of the valve centres, a new or modified inlet rocker arm. Any ideas on that welcome
Plenty of compression is available if a bigger piston is used, so room to move compression wise.
I am all for a shorter stroke and larger bore, "Especially"
the shorter stroke.
Another thing that could be an improvement would be to increase the inlet tract angle which may require a move to fuel injection to gain clearance between the backbone of the frame....:spin::spin::spin:
There is always plenty to think about.
Cheers spanner
Dr C made a head where he moved the inlet valves centres apart.
I think all information was lost on the web at some stage.
It might be nice to run the 570 titanium 39.9mm inlet valves in the 628
but it would require some post valve porting
and the moving of the valve centres, a new or modified inlet rocker arm. Any ideas on that welcomePlenty of compression is available if a bigger piston is used, so room to move compression wise.
I am all for a shorter stroke and larger bore, "Especially"
the shorter stroke.
Another thing that could be an improvement would be to increase the inlet tract angle which may require a move to fuel injection to gain clearance between the backbone of the frame....:spin::spin::spin:
There is always plenty to think about.
Cheers spanner
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
Joined Sep 2007
782 Posts | 291+
???
Yes we did,
Would be nice if RC8 head fitted but I have my doubts even if the
studs matched the water jackets and cam chain alignment could also cause
problems.
Easier to mod the Husaberg head IMO.
With a shorter stroke 550 cases might be best to use.
Shorter stroke= less rod angle or shorter rod= less reciprocating weight.
Higher RPM
Would be nice if RC8 head fitted but I have my doubts even if the
studs matched the water jackets and cam chain alignment could also cause
problems.
Easier to mod the Husaberg head IMO.
With a shorter stroke 550 cases might be best to use.
Shorter stroke= less rod angle or shorter rod= less reciprocating weight.
Higher RPM
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
yes my 105mm liner is from JBS made by westwood but cost more than double through JBS
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
good idea to change at 50 -100 hrs on the 16mm wide NTNs if used both sides, even less with SKFs
100hrs is easy if you use a 20mm wide c4 roller on the drive side and 1mm end float
they may last longer than that depending on use but thats what i'm comfortable with looking at the wear with my 80mm stiffer crank.
the extra bang in mine was proportional to the extra CCs
100hrs is easy if you use a 20mm wide c4 roller on the drive side and 1mm end float
they may last longer than that depending on use but thats what i'm comfortable with looking at the wear with my 80mm stiffer crank.
the extra bang in mine was proportional to the extra CCs
Last edited:
Joined Sep 2013
369 Posts | 209+
canolbarth cymru
Was the Westwood liner supplied by JBS a straight fit? The 105mm liner direct from Westwood would need machining? What piston did you use Bush?
Sorry for the dumb questions!!
BTW I'll be drooling in the old folks home long before I put 100hrs on my engine road racing! most meetings are less than an hour track time!
Sorry for the dumb questions!!
BTW I'll be drooling in the old folks home long before I put 100hrs on my engine road racing! most meetings are less than an hour track time!
Joined Jun 2007
4K Posts | 1K+
south east WA Australia
I got the westwood 105mm liner, piston, head studs and head gaskets from JBS racing this is what jbs call the "700" kit.
the liner should have been a straight fit as they are all checked for fit in a set of 02 cases by jbs but my cases had more material in the water jacket area of teh left hand case which i took out with a dremel.
I also machined cooling grooves in the OD of the liner and later put a groove in the top of the liner for a wire ring to embed into a copper fire ring.
my kit was good except for the headgasket
CR was 11.3:1 and it had quite big squish with their piston, this is on the 80mm crank
http://husaberg.org/mechanical/11677-jbs-700-kit-welded-80mm-crank.html
if you get a liner direct from westwood they can make it to whatever dimensions you specify, they have details of a 650 102mm liner that i drew, the outside dimensions will be the same you just have to specify the finished ID of the bore and get a custom piston .. made after you measure the liner.
remember my engine has the stiffer 80mm crank so the theory is that your mains will not last as long with an 82mm crank
the liner should have been a straight fit as they are all checked for fit in a set of 02 cases by jbs but my cases had more material in the water jacket area of teh left hand case which i took out with a dremel.
I also machined cooling grooves in the OD of the liner and later put a groove in the top of the liner for a wire ring to embed into a copper fire ring.
my kit was good except for the headgasket
CR was 11.3:1 and it had quite big squish with their piston, this is on the 80mm crank
http://husaberg.org/mechanical/11677-jbs-700-kit-welded-80mm-crank.html
if you get a liner direct from westwood they can make it to whatever dimensions you specify, they have details of a 650 102mm liner that i drew, the outside dimensions will be the same you just have to specify the finished ID of the bore and get a custom piston .. made after you measure the liner.
remember my engine has the stiffer 80mm crank so the theory is that your mains will not last as long with an 82mm crank
Last edited:
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