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Article from old yahoo site:
http://hem.passagen.se/martb/ramar/suzuki/suzbild3.html
"Tuning the Freewind.
On request, this part will be translated. Above, I briefly described the
tuning of my Freewind. In short, the silencer is swapped and the carburetors
are re-jetted. But to be honest, that's not the whole story...
When I left the bike to the shop for its first service (1000km) they also
strapped it to the dyno. They swapped the original 5.9 kg:s
heavy-rust-free-metal-exhaust-strangler-silencer in favor of the 2.2 kg:s
very-hollow-and-light-alu CRD silencer. The lid on top of the airbox was
removed. And the carburetors were re-jetted. That's the easy understandable
part. When I picked up the bike I also got a few "extra" pieces back that
they didn't thought was necessary mounted on my bike. They said that the
bike worked better without them...
By looking in my Suzuki Genuine Service Manual, I think I can identify those
"redundant" pieces as:
Vacuum chamber
Vacuum Transmitting Valve
Solenoid Valve
Some hoses
Throttle Position Sensor, not removed but electrically disconnected.
More interesting reading from the manual:
The Freewind carburetors features a fancy system called "PISTON VALVE LIFT
CONTROL SYSTEM" (!). Quote: "This system controls sudden rising movement of
the piston valve". The piston valve in this case is simply the throttle...
By compiling what I have read in the manual and the things I've heard, this
is how I understand the system: in 2:nd and 3:rd gear (signal from the gear
position sensor) the solenoid valve opens and puts vacuum from carburetor #2
on the , making it to open. By opening the Lift Control Valve, air from the
discharge side of the air filter is led into the diaphragm chamber (above
the diaphragm) thus preventing the piston valve to lift. That means less
air, less gas and as you all probably already have guessed, less power. Did
you understand that? If interest exists I might consider scanning some pics
from the manual.
I suppose many of you readers get itchy fingers after reading this. Yes,
probably you can get a noticeable power gain by only unplugging the Solenoid
Valve but I don't give any guarantees of power gains or reliability. The
air/fuel-mixing system is very delicate and should be left to professional
to mess with. Meltdown is the worst case scenario if you get your mixture
too lean. In my case, the shop who dynoed my bike had a Lambda-probe
connected so they could monitor the mixture under all load/rpm
circumstances.
The only thing they didn't got 100% was the bangs when braking with the
motor. That indicates a bit too lean mixture on closed throttle or maybe
just a bit too empty silencer..."
EXTRACT FROM MANUAL (pdf on Members Page Page 119 [4-10]) - Pay
Up & Join then you can see!!!
The piston valve lift control system
composed of lift control valve, V.T.V
(Vaccuum Transmitting Valve), vacuum chamber and solenoid valve. This system
controls sudden rising movement of the piston valve
Blah blah
Little thing with the orange end (sorry not stipe) is the VTV see 'Hoses'
Pic
Caps & Clips
Suzuki Part Numbers
CAP 13274-84000
CLIP 09401-06101
(2 of each one for the Vaccing Point on the right hand carb, used to balance
the carbs etc - just like the left hand carb - one for the White lift
control valve on top of the carbs - see 'Carb Caps' Pic {in this pick you
can still see - if you squint like a magic eye picture - the small length
off grey hose that links the two white lift control valve thigies - couldnt
be arsed to remove this as i won't do any thing anymore - the plug was just
to stop crud getting in}
NOTE: I Have not removed the throttle position sensor and the airbox lid is
ON with the snorkles removed
I dont think th 05 models use any of this stuf either - or the one i saw in
a shop had already had it removed.
Usual Disclaimer - If it all goes Tits up - it wasnt me OK!
hoses
carb caps
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