All parts are fully tested under race conditions
please click on the images to see larger versions.
magnesium caliper
 1981 4 Piston one piece Magnesium , with 31mm pistons
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Brake Disc 1981
 1981 320mm front discs with magnesium centre
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Swing Arm
 1981/S1 swing arm with bosses for braided hose connections .
features 4 bolt clamping and quick adjuster axle , adjusts both sides together . extra wide for 6" rims and 195 tyres .
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Yolks/ triple trees
 light weight under relieved and supplied in any width for modern day wide front tyres .
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Clutch Pull Plate
 1981 / 1982 lawson style clutch pull plate
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right side rear set
 1981 style brake plate , footrest pivot has needle roller bearing
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left side rear set
 1981 style gear change rear set , pivot has needle roller bearing .
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Oil Cooler
 1981 style oil cooler pictured on machine , we now only supply EARLS oil coolers , the best there is .
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Crankshaft blank left
 1981 left side crankshaft blank plate with oil seal .
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1981/82 Seat
 1981 /82 S1 seat , pattern taken from an actual S1 seat cover .
seat covers available separately .
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One piece seat / tailpiece
 one piece seat /tailpiece /number board unit with fitted dummy tail light .
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oil cooler kit
 1981/1982 S1 complete EARLS oil cooler kit
runs braided lines under the motor up to the cooler position under the head stock .
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oil cooler take off
 1981 / 1982 S1 oil cooler take off fitted to motor .
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close ratio gearbox
 close ratio gearbox , longer clutch shaft for later model clutch ,longer output shaft for wider wheels , large undercut engagement dogs .
custom made with customer ratio,s .
gearbox suppleid complete ,shimmed , ready to install .
28 mm output shaft , with supplied bearing fits z900/z1000/ gpz .
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1981 decals
 1981 decals
supplied with KERKER decals
beautiful cobalt blue with white border
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oil cooler take-off
 works style oil cooler take-off ,uses -8 ( AN8) braided line fittings .
uses stock pressure switch , supplied with blanking plug / gaskets / allen bolts .
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lightened crankshaft
 lightweight stock crankshaft
lightened/pinned/welded/polished
dynamically balanced
every crankshaft comes with balancing certificate
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