 |
|
| FINAL DRIVE (SHAFT DRIVE) |
|
| middle gearbox |
[ middle drive gears ]
Only on engines with a transverse crankshaft (i.e. at 90° to the main
axis of the bike). Situated at the end of the gearbox output shaft (where
the front sprocket is located on chain driven bikes). Transfers the drive
90 degrees to engage the drive shaft. Sometimes termed the ‘bevel
box’ but this term can also be used for the final drive unit (e.g.
BMW Paralever), so is best avoided |
| primary shaft |
[ primary drive shaft ]
On engines with a longitudinal crankshaft (i.e. in line with the main axis
of the bike). Transfers drive from the gearbox output shaft to the UV joint
/ drive shaft |
| universal joint |
[ UV joint / UVJ ]
Two U-shaped pieces joined to a central hub, but oriented at 90° relative
to each other. Located between the middle gearbox or primary shaft &
the driveshaft. The UVJ allows the driveshaft to angle downwards towards
the final drive unit/rear wheel (e.g. Honda CX500 CX650 / Suzuki GS650 GT
GS850G) |
| driveshaft |
[ propshaft / final drive shaft ]
Runs from the middle gearbox or primary shaft through the swinging arm into
the final drive housing |
| final drive unit |
[ rear diff / rear differential ]
Turns the drive 90 degrees from the driveshaft to engage the rear wheel.
Although commonly called a ‘diff’ it is not actually a true
differential as it only provides one output not two |
| rear wheel drive flange |
[ star drive / drive hub / rear wheel clutch hub ]
Part which transfers drive from the final drive unit to the rear wheel.
Usually has lugs which locate into the rear wheel (similar to a sprocket
carrier on a chain driven bike) |
| rear wheel dampers |
Fits between the lugs on the star drive (drive hub / clutch hub / drive
flange) & the rear wheel. Provides a cushion between the wheel &
drive flange during acceleration |
|
|
| FOOTRESTS |
 |
| hanger |
[ footrest bracket / footrest mounting plate / rearset ]
Alloy or steel bracket(s) mounting the footpeg & pedal assemblies to
the frame / rear subframe. Although the term ‘rearset’ is sometimes
used to describe a complete front hanger assembly, it is more commonly used
for aftermarket adjustable / racing rearsets (e.g. Harris / Gilles), so
is best avoided if you are looking for original parts |
| LH / RH front hanger |
[ rider’s hangers ]
Triangular brackets (alloy or steel) which mount the rider’s footrests
(pegs) to the frame (e.g. Yamaha FZ1 Fazer). The gear lever usually attaches
to the LH hanger, the rear brake pedal to the RH hanger |
| LH / RH rear hanger |
[ pillion hangers ]
Mount the pillion footrests to the frame / rear sub frame. Often support
the exhaust silencer/s (e.g. Aprilia RS50 / Suzuki RGV250 / Kawasaki GPX600
R |
| LH / RH hanger |
On bikes where one large hanger either side supports both the rider &
pillion footrests (e.g. Kawasaki ER-5, ER-6, Honda CB500, ST1100) |
| LH / RH front peg |
[ front footrest, rider’s footrest, front foot peg ] |
| LH / RH rear peg |
[ rear footrest, pillion footrest, rear footpeg ] |
| LH / RH heel plate |
[ heel guard]
Can be part of the front hanger casting (e.g. Honda VFR400 R NC30), or a
separate piece that bolts to the hanger (e.g. Triumph 675 Daytona) |
|
|
| FRAME / CHASSIS |
|
| frame |
[ chassis ]
This is the main structural part of the bike which large components (e.g.
engine) bolt to. Also incorporates the identity of the bike in the frame
number / VIN (Vehicle Identity Number). You need to specify if you want
the V5C Registration Document (log book) with the frame. It is also worth
stating whether you would consider a damaged frame (e.g. one that needs
to be be jigged in order to straighten it) |
| frame & log book |
Frame including the V5C Registration Document |
|
|
| FRAMEWORK / FRAME FITTINGS |
|
| front subframe |
[ fairing frame / fairing bracket / headlight bracket / clocks bracket
]
Steel or plastic bracket that mounts the top fairing, headlight and clocks
(may also mount mirrors) |
| mirror stay |
[ H-frame / H-bracket / mirror bracket / fairing brace ]
Mounts the mirrors and supports the ‘ears’ of the top fairing.
Usually in one-piece (e.g. Suzuki GSX-R600 / GSX-R750 SRAD / Kawasaki ZXR400
H / L), but can be RH & LH (e.g. Cagiva Mito / Ducati 916 / 996 / 998
/ 748 / Yamaha FZS600 Fazer) |
| rear subframe |
Steel or alloy support frame for the rear plastics & seat etc. Usually
bolts to the rear of the main frame (but may be part of the frame on some
bikes e.g. Yamaha YZF-R1 4XV or those with steel frames e.g. Yamaha XJR1300
/ Honda CB1300 / Suzuki GSX1400) |
| grabrail (s) |
[ pillion grab handle / handles ]
Single piece (e.g. Honda CBR1100 XX Blackbird / Suzuki SV1000 N SV1000S)
or RH & LH handles (e.g. Kawasaki ZRX1100 / Honda VFR800 V-TEC / Yamaha
YZF600 R Thundercat) for pillions to hold on to |
| rear rack |
Sports rack / carrier rack. Anchor point for luggage - different types
available. Can be used to strap items to (e.g. sports rack - often incorporates
a pillion grabrail - Renntec), or designed to carry a top box (may incorporate
a mounting plate specific to the top box manufacturer) |
| bungee hooks |
Anchor points for bungee or straps used to attach luggage (e.g. Kawasaki
ZZ-R600 / ZZ-R1100) |
| centre stand |
[ main stand ]
Can be supplied with or without spring & pivot bolt |
| side stand |
Can be supplied with or without spring & pivot bolt. Sometimes has
detachable mounting bracket |
| side stand switch |
[ side stand cut-off switch ]
Kills the engine to prevent riding off whilst stand is in lowered position |
|
|
| FRONT SUSPENSION |
|
| forks |
[ front suspension / front shocks / fork legs ]
The main front suspension units. There are many different designs, but the
most common are telescopic oil-filled forks |
| conventional forks |
[ right-way-up (RWU) forks ]
Type of telescopic fork where the chrome stanchions (thinner part of the
forks) are gripped by the yokes & remains static. The larger aluminium
lowers slide up & down over the stanchions (e.g. early Honda CB600 600
/ Hornet 900 / Kawasaki ZX-9R C E F1P F2P) |
| USD forks |
[ upside-down / inverted forks ]
Telescopic type where the thinner chrome stanchions are at the bottom near
the wheel. The larger alloy uppers remain static & are gripped by the
yokes (e.g. Suzuki GSXR750 Slingshot / Benelli Tornado 900 Tre / Hyosung
Comet 650 / Laverda 750 650 S Formula). |
| stanchions |
Thinner chrome part of forks. At the top on conventional forks, at the
bottom near the wheel on USD forks |
| sliders |
Refers to the part of the fork which moves up & down. On conventional
forks these are the thicker alloy lowers, on USD forks the sliders are the
thinner chrome stanchions. It is always best to specify whether the sliders
are the alloy or chrome part of the forks |
| fork tubes |
Often used to describe the alloy part of the forks, but since the chrome
stanchions are also physically tubes, this term is best avoided as it can
be misinterpreted - use ‘fork lowers’ for conventional forks
or ‘fork uppers’ for USD forks |
| yokes |
[ triple clamps / top & bottom fork clamps ]
Fit above & below the frame headstock |
| bottom yoke |
[ lower fork clamp / triple clamp ]
Grips the forks under the headstock. Usually supplied with steering stem |
| top yoke |
[ upper fork clamp ]
Grips the forks above the headstock & bolts to steering stem |
| fork brace |
Usually an aftermarket (non-standard) part designed to provide additional
bracing for the forks to improve rigidity. Fixes above the front mudguard,
common brands are Telefix and Micron. Often confused with the front mudguard
mounting bracket which doesn’t provide much in the way of structural
support |
| anti dive units |
Used on 1980s-early 90s sports bikes. Designed to reduce the amount of
dive on the forks under braking. Usually found at the bottom of the forks |
| telelever suspension |
Used by BMW for most models from early-mid 90s onwards. The Telelever
is a wishbone shaped leading link (swing arm) which pivots on the engine
and is connected to the forks by a lower ball joint. The system uses a shock
absorber to provide shock absorbsion & damping (e.g. BMW R1100 GS R1150GS
R1200GS Adventure) |
| front swing arm |
Used by bikes which have a front shock absorber in place of telescopic
forks (e.g. BMW Telelever / Peugeot Speedfight 50 100 / Italjet Dragster
50 125 180 Formula) |
|
|
| FUEL & AIR MIXTURE |
|
| carbs |
[ carburettor / carburettors ]
Mixes fuel & air prior to combustion. Can be CV (constant velocity)
type with diaphragms (slides are opened by air flow through carbs) or slide
type (no diaphragms - slides are opened directly by throttle cable) |
| throttle bodies |
[ injector body / throttle body ]
Contains the fuel injectors and throttle butterfly valve(s). Mixes fuel
& air prior to combustion |
| injectors |
Situated within throttle bodies, the injectors spray fuel into the air
passing through throttle valve |
| Throttle Position Sensor |
[ TPS ]
Reports the position of the throttle butterfly valve(s) to the ECU / CDI
as part of the ignition timing and fuel injection system |
| fuel pump |
Electric pump delivering fuel from the petrol tank to the carburettors
/ injectors. Can be internal or external type (i.e. located inside or outside
the fuel tank) |
| fuel pressure regulator |
Regulates the fuel pressure to the injectors |
| fuel filter |
Removes impurities from the fuel (e.g. debris from petrol tank) |
| inlet rubbers |
[ inlet manifold / inlet stubs ]
Rubbers connecting the carbs or throttle bodies to the engine |
|
|
| FUEL TANK |
|
| fuel tank |
[ tank / petrol tank ] |
| fuel tap |
[ petrol tap / fuel cock ]
Manually operated tap allowing the rider to switch to reserve (i.e. uses
a lower exit pipe inside the fuel tank) or to turn off the fuel supply to
the carburettors |
| fuel knob |
Plastic knob used to operate the fuel tap. Commonly has ‘on’,
‘reserve’ & ‘off’ positions |
| fuel cap & key |
[ petrol cap ]
Lockable fuel filler cap complete with matching key |
| tank rubbers |
[ rubber fuel tank mounts ]
Prevents vibration & damage to the petrol tank / frame |
| tank mounting bracket (s) |
Usually mounts the rear of the tank to the frame |
| fuel guage sender unit |
[ petrol sender ]
For bikes fitted with a fuel gauge. Mounts inside the tank and measures
the fuel level using a float connected to a potentiometer (sends variable
resistance reading to the fuel gauge clock) |
|
|
| GEARBOX |
|
| gearbox complete |
[ transmission ]
Set of paired gears (gear clusters) each located on an input shaft and output
shaft. A complete gearbox usually includes the selector drum & selector
forks, but always double check exactly what is being supplied for the agreed
price |
| input shaft |
The gearbox shaft which engages (and it driven by) with the clutch centre.
Mounts one half of a set of paired gears, the other half being mounted on
the output shaft |
| output shaft |
Connects to the front drive sprocket (chain driven bikes) or primary shaft
/ middle gearbox (shaft driven bikes). Mounts one half of a set of paired
gears, the other half being mounted on the input shaft |
| selector drum |
[ selector barrel ]
Connects to the gear selector shaft; moves the selector forks to shift (engage)
the paired gear cogs when changing gear |
| selector forks |
Engages different paired gear cogs by moving (shifting) them along the
input & output shafts |
|
|
| HANDLEBARS & SWITCHES |
|
| handlebars |
One piece type, held onto risers by clamps |
| RH handlebar / LH handlebar |
[ clip-on / clip ons ]
Separate RH & LH handlebars, usually attaching to either fork leg. Can
have a separate mounting brackets (clips) or be single cast units |
| handlebar clamps |
Secure one-piece handlebars to the top yoke |
| handlebar risers |
Usually part of the top yoke casting, but aftermarket kits are available
to convert separate clip-on bars to one-piece type, or to increase the height
of one-piece bars |
| bar end weights |
[ bar ends ]
Fits into the end of the handlebars - usually weighted to reduce vibration
at high speed |
| steering damper |
Reduces erratic handlebar movement (tank slapper) at high speed. Traditionally
uses an oil filled damper, but electronically controlled devices have recently
become available. Can be a standard (original equipment) or an aftermarket
performance upgrade |
| LH switch gear |
[ LH switch cluster ]
Switch assembly on LH handlebar. Usually incorporates high/low beam, pass
(flash), horn button & sometimes the choke lever |
| RH switch gear |
[ RH switch cluster ]
Switch assembly on RH handlebar. Usually incorporates starter button, cut
off / kill switch & lights on-off
|
|
|
| LEVERS & PEDALS |
|
| front brake lever |
On RH handlebar |
| rear brake pedal |
[ rear brake lever ]
Located on the RH rider’s footrest mounting bracket (hanger) |
| rear brake lever (mopeds / scooters) |
Located on LH handlebar |
| clutch lever |
Located on LH handlebar |
| kickstart lever |
[ kickstart / kick start / kickstarter / kickstart pedal ]
Foot operated lever to turn over (start) the engine |
| gear lever |
[ gear changer / gear shifter / gear shift / gear change pedal ]
Located on the LH rider’s footrest mounting bracket (hanger) |
| gear lever linkage |
Steel rod & small ball joint assembly connecting the gear lever to
gear selector shaft (protruding from the engine) |
| choke lever |
Can be on handlebars (sometimes part of the LH switch gear), mounted to
LHS of frame or on the carbs themselves. Some fuel injection bikes also
have a choke lever |
| decompression lever |
Assists engine kick-over on large capacity single & twin cylinder
trail bikes by temporarily decompressing the combustion chamber |
