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EXUP
(Exhaust Ultimate Powervalve)
Whats
it all about?
Yamaha was the first to develop such
a system in the late 1980's, called the Exhaust Ultimate
Power Valve (EXUP). The valve is fitted to four-stroke
exhausts and constantly adjusts the internal diameter
of the exhaust system by way of a rotating blade across
the collector box. This "tunes" the exhaust
to better suit engine sppeds; thus creating more low
down torque than a conventional exhaust. The valve is
moved by a servo controlling a push and pull cable system
that's linked to the bikes CDI unit.
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What does it look like?
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Let's start at the front.
The forks are gold nitrided GSXR1000 units, with full
Ohlins
internals.
The front wheel is a carbon-fibre Dymag
with a one-off stainless steel spindle, machined by
Kevin Bartlett of POD
Manufacturing. POD was set up in 2005 by Kevin and
his business partner Paul Debling, and specialises in
motorcycle parts as well as precision engineering for
the pharmaceutical and aerospace industries.
The front brake calipers are Tokico six-pots from a
Suzuki
GSXR1000 K1.
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The forks are married to
an LSL
straight bar conversion. LSL are a German company specialising
in aftermarket bars for sports and touring machines,
as well as rearsets, steering dampers and other accessories.
Don't worry if you don't speak German, you can find
a range of their products in English at Motorcycle
Road & Race. |
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The frame was custom-built
by Lee at Steelheart
Engineering in Canterbury back in 1997 and originally
housed an 1990 FZR 1000 motor with billet clutch, Stage
3 Dynojet
kit, Dyno coils and the usual tuning bits you would
expect to find on an Exup.
It was a great fun bike to ride as you can imagine
and was the genesis (groan!) of the project as you see
it today. |
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The steel frame has been powder-coated
by ?????? for corrosion protection and appearance - I'm
still not sure what the bike's final colour scheme will
be nor what sort of clothes she's going to wear! |
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The rear end is shod with 200-section
rubber on a magnesium Dymag wheel, painted carbon-effect
by an artist in the USA. I'm running a 37-tooth rear sprocket,
purchased to suit the wheel. The rear brake caliper is
a Brembo
unit, and the tyre size is 200/50/17. |
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Looking back from the swingarm
pivot, you can see the Ohlins
shock. The shock is a fully-adjustable YZF750SP unit
(for more info see below). |
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The YZF750SP swingarm will
be replaced by a custom-built one eventually. The swinging
arm spindle is another stainless one-off by Kevin at
POD Manufacturing. You'll find his handiwork elsewhere
on the bike as the build progresses.
You can see the compression damping adjuster mounted
to a custom bracket on the frame. |
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The Ohlins shock features
a remote reservoir (where would bikers be without cable-ties?)
and hose-mounted hydraulic spring preload adjuster.
It is fully adjustable for length, compression and rebound.
That black hose you can see leads from the shock body
to the preload adjuster on the other side of the frame,
which you can see better in the picture above. |
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run by EXUP enthusiasts, for EXUP enthusiasts Contact the webmaster
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