GPX MOTO GPX 450RFSE User guide
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ADVICE
Motorcycles are very dangerous. Check your motorcycle carefully before every ride to ensure
everything is working correctly. Do not ride if you are under the influence. If you cannot ride a
motorcycles , do not ride a motorcycle. Its your life and wellbeing so be careful with it.
Most of off-road motorcycle fatalities are caused by head injuries. Without helmets, the chances of
serious injury or death caused by head injuries are much higher. Always wear an approved
motorcycle helmet and protective apparel such as goggles, gloves , knee and elbow protectors and
boots while riding, which will save your life at the critical moment.
This motorcycle was designed for off road racing , therefore there is no capacity to carry a
passenger .Please therefore do not use this motorcycle to carry any passengers. Ignoring this or order
rules could lead to serious injury or a fatality.
Always go riding with another person so you can help each other.
Do not use non-original parts to modify this motorcycle. If you need to replace any parts, please use
spare parts and accessory products that are approved and / or recommended by GPX and have them
installed by an authorized GPX workshop. GPX accepts no liability for any personal modification,
other products and any resulting damage or loss.
Our GPX series products are specially designed for off-road racing and riding.
Please take care of your vehicle and avoid any problem caused by improper use.
Please check your motorcycle carefully before riding and do the maintenance accordingly after use.
If you crash the motorcycle, check the condition of the motorcycle before you resume your journey.
Ignoring this advice could easily lead to an accident and endanger your own safety as well as others ,
as you may be riding a broken or faulting motorcycle .
When using this motorcycle, the temperature of the engine and exhaust pipe is very high, so it needs
to a period to cool down after parking. During this period, do not touch the engine or exhaust pipe as
you will scold yourself.
Do not wear shorts while riding, otherwise leg injuries may happen.
APPEARANCE
GPX 450R FSE COMPONENTS AND POSITIONS
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No.
Name
No.
Name
1
Front mudguard
11
Front brake hose
2
Clutch lever
12
Engine sump shield
3
Coolant overflow tank
13
Electric starter motor
4
Petrol cap and tank vent hose
14
Front sprocket
5
Seat
15
Side stand
6
Rear mudguard
16
Air box cover
7
Rear light and no plate mount
17
Drive chain
8
Front brake cover
18
Rear sprocket
9
Front suspension compression adjustment
10
Front brake caliper
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No.
Name
No.
Name
19
Rear brake disc and caliper
30
Rear suspension rebound adjustment
20
Exhaust silencer
31
Oil level window
21
Rear suspension compression adj
32
Rear brake lever
22
Radiator cap
33
Oil filter access
23
Front suspension rebound adjustment
34
Oil strainer access
24
Throttle
35
Sump shield
25
Front brake lever
36
Front fork protector
26
Front LED light
37
Front suspension compression adjuster
27
Rear wheel spindle
38
Front wheel spindle
28
Chain adjustment
39
Front exhaust
29
Rear suspension height adjustment
Tips and Tricks and keep your GPX 450R FSE FSE in tip top condition.
Following these tips will help to serve you with a reliable and long lasting motorcycle
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1. Read this handbook !
2. So you don’t forget and over run ,keep your own dated and mileage recorded list of when you carried
out this maintenance. Showing this record and keeping oil and parts receipts to a buyer in the future
will help to prove you have looked after your GPX.
3. Clean the air filter and lubricate this with air filter oil after each 4 hours of riding or each competition.
4. Check and adjust your engine oil level before each ride.
5. Use good quality fully synthetic 10W/40 motorcycle oil (full specification beneath)
6. Change your engine oil , paper filter and clean the oil strainers every 10 hours of riding or after each
competition.
7. Check / adjust and lubricate your chain before each and every ride.
8. Wash your bike propertly and carefully. Avoid the air box, carburetor ,fuel tank vent hose, bearings
and electrical connector and components.
9. Dry your motorcycle after you wash. Use an air line , paper or cotton towels or a leaf blower if you
have one. Start at the top and down downwards towards the floor, drying the wheels last.
10. If you are not confident or don’t know how to maintain a motorcycle speak to your dealer, or seasoned
motorcycle mechanics , not your neighbour .
11. Lightweight dirtbikes are not like cars.They need adjusting , tweaking and maintaining regularly. Its
just part of the fun. Speak to your dealer if you want reliable advice.
12. Check you brakes , throttle and clutch before each ride. Be safe.
13. If your unsure about anything …STOP and get good advice.
VIN CODE
Vin code of the GPX 450R FSE ,is located on the head
stock.
CHASSIS NUMBER
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PARAMETER
DIMENSIONS AND SPECIFICATION - GPX 450R FSE
L*W*H（mm）
2180×820×1254
Wheelbase（mm）
1480mm
Net weight（kg）
110
Tire size
F: 80/100-21；R: 110/100-18. Rear will accept a 140 80/90 18” Enduro or
MX tyre
Seat height（mm）
939mm. This can be reduced by 55mm to 884mm by using the 2nd lower
shock bolt , at no expense.
Min ground clearance
（mm）
330mm
Tank volume（L）
9.4 litres
Engine Parameters
Engine type
Single-cylinder, water-cooled, four-stroke,
four-valve overhead cam, balance shaft
structure
Clutch type
Manual wet multi-piece
Cylinder
diameter×stroke
94.5×64 mm
Displacement
449cc
Compression Ratio
10.7:1
Oil type /capacity
Fully synthetic 10W/40
Especially suitable for wet clutches
High wear resistance
API SN Plus (Euro 5 compatible)
JASO MA2
Oil capacity
1700ml after filter change
1600ml without filter change
ALWAYS check oil level is to the correct dipstick height on a level surface
AND that it appears at the correct level in the engine window.
Shift type
Constant mesh two-stage
transmission six-speed transmission
International profile 1-N-2-3-4-5-6. Primary reduction ratio: 2.91
Transmission ratio of each gear:first gear: 2.58
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Second gear: 1.8 Third gear: 1.33 Fourth gear:0.98 Fifth gear: 0.88 6th-
Starting
Electric 12v Electric start with starter.CDI.
Fuel control system
Electronic fuel injection
Battery
Stock 12v battery for high performance electric starting and reliable
electronics . Stock battery code HJTX5L-FPZ
Chain
520. Front is 13 teeth and rear 52.
Frame/Shock/Brake/Wheel system Parameters
Frame type
Central double cradle type high-strength steel tube frame, GPX
International patent design
Front shock
SZC Front suspension. 310mm travel. Comprising of quality high
performance Telescopic, closed cartridge type units with adjustable
compression and rebound. Seals , dust seal and range of springs available
(after market), L=950mm.
Rear shock
Compression recovery dual adjustable nitrogen airbag rear shock,
L=480mm, 300mm travel , CRF general configuration.Quality high
performance unit with spring preload, adjustable compression as well as
rebound damping
Swing arm
High strength forged aluminium alloy structure
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Handlebar
Competitive high-strength aluminium alloy fat bar (imported),，material
7075 Φ28.6mm, with GPX special ultra-soft off-road grip
F/R rims
F 1.60×21, R 2.15×18, 7050 high strength aluminium rim ，
forged CNC wheel hub
F brake system
Powerful Hydraulic alloy twin piston caliper with 260mm disc
R brake system
Powerful Hydraulic alloy twin piston caliper with 240mm disc
Others
Air filter type
Sponge filter core filter type
Fuel type
92# and above grade gasoline.
Motorcyclists
1 person（rider）
Maximum load weight
120kg
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CONTROL
CLUTCH
The clutch is controlled by the clutch lever, which is
fitted on the left side of the handlebar.
By adjusting 2 the screws indicated you can change the
biting point of the clutch and the distance between the
clutch lever and handlebar to your preference.
FRONT DISC BRAKE
The front disc brake is controlled by the hand brake
lever, which is fitted on the right side of the handlebar.
By adjusting the small bolt on the lever you can change
the biting point of the lever and the distance of the
brake lever to your preference.
The front wheel adopts the floating - caliper disc brake,
which is installed under the left front fork and fixed by
two bolts.
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THROTTLE LEVER
er
The throttle lever is located on the right side of the
handlebar. The throttle is very sensitive.
Turn the throttle counter clockwise to increasing the
engine speed and power ouput. The reverse will reduce
the engine speed and power output. It will back to
normal smoothly once you lease the handle.
STARTING
The start button is a square one and fitted on the right
side of the handlebars, near the throttle grip.
It is expected that you will only need to press this button
for a maximum of 2 seconds to start the motorcycle .
Release the button as soon as the engine starts . If the
engine does not start , then visit the troubleshooting
pages for help.
Attention：When starting the motorcycle in any gear ,
you should operate the clutch with your left hand to
avoid possible sudden forward motion when starting the
GPX .
The TSE engine has a kick start also , as well as the
electric start through the start button.
STOPPING
The red stopping button is fitted on the left side of the
handlebar near the grip.
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FUEL TANK CONNECTION
The fuel tank is disconnected from the fuel supply by
disconnecting the two fuel and electrical connectors
from the tank mountings. You can also see the
cylindrical fuel pump in this photo. This will make a
slight noise as it primes , as you turn the igntion on.
SHIFTING
The gear shift is located on the left side of the engine.
This is operated by the left foot by pushing down or by
pulling up with your foot.
The GPX engine has six gear as International Standard,
and you can find the illustration on the left.
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REAR DISC BRAKE
The rear brake pedal is located on the right side of the
engine and is operate by pushing down on it gently using
the right foot.
The rear brake adopts a floating caliper disc brake. This
is located on the right side of the rear wheel and fixed
by a disc brake bracket.
SIDE STAND SUPPORT
The GPX has a retractable side stand for parking.
When parking, make the stand is fully down. When
operating the motorcycle make sure the stand is
retained in the up position by use of the rubber band.
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PREPARING FOR USE
ADVICE ON FIRST USE
1. Before your first trip, read the entire operating instructions carefully, especially the section of
“Controls” and “Riding Instructions”.
2. When driving, please carry out a standardized run-in period first.
3. If any parts problems are found during using, you can repair that according to this manual or
contact GPX Dealers for professional aid.
4. After each use, clean the vehicle with running water.
5. GPX is not responsible for any vehicle problems caused by malicious acts
RUN-IN PROCESS
Motorcycle engines have a lot of relative moving parts, such as pistons, piston rings, cylinder
blocks, meshing transmission gears, etc. Therefore, in the initial stage of use, the engine must be
operated more gently than when riding afterwards . The running-in can make the moving parts
adapt to each other, correct the working gap, and form a good smooth friction surface that can
withstand larger loads. Only after standard running-in can the engine have excellent performance
and reliability.
The recommended running-in steps are as follows:
1.
0-2.5h stage: Using under the throttle level of 50% ~ 75%, the speed should be changed
frequently to avoid the motorcycle working at the same condition for a long time,
Let the engine rest and cool down for 5 ~ 10 minutes after each 1-hour work.
Do not accelerate suddenly to protect your throttle.
2.
2.5-4h stage: Using under the throttle level of 50% ~ 75% throttle and work for a long time at
the same condition.
In actual working, the throttle can be up to full level, but not more than 5 ~ 10 seconds;
3.
4-5h stage: Using under the throttle level of 75% ~ 100%
4.
More than 5h: increase the speed to 60 ~ 80km/h, until the full engine performance can be used.
DANGER：When riding a motorcycle, do not speed up regardless of the consequences. This
behaviour can easily cause engine damage and also cause safety accidents.
So, please ride the vehicle properly.
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RIDING INSTRUCTIONS
PREPARATION BEFORE RIDING
1. Check fuel level in fuel tank and replenish if necessary.
2. Check fluid level in front brake fluid reservoir and replenish if necessary.
3. Check fluid level in rear foot brake fluid reservoir and replenish if necessary.
4. Check brake pad wear condition of the front brake.
5. Check brake pad wear condition of the rear brake.
6. Check that both brakes operate correctly.
7. Check the antifreeze level.
8. Check the chain for the condition and correct tension
9. Inspect rear sprocket, engine sprocket and chain guide structure to ensure the condition is good.
10. Check the chain adjuster to ensure the lock bolts are tight.
11. Check the outer surface of the tire.
12. Check tire pressure.
13. Check battery level.
14. Check the thickness of the front disc brake.
15. Check the thickness of the rear disc brake.
16. Check the torque of each fastener.
17. Check the rear sprocket to ensure the condition is good.
18. Check engine casings and plastic cover parts to ensure a good condition.
19. Check the fuel tank switch.
PRECAUTIONS FOR STARTING
The required to start the GPX are as follows:
1. Turn on the ignition key
2. Wait for the fuel pump pump to prime with a short whining noise.
3. Pinch the clutch lever with the left hand;
4. Pinch the brake lever with the right hand;
5. Push the starter button until the engine starts but no longer than 2 seconds;
6. Release the starter button after the engine starts.
PRECAUTIONS FOR STOPPING
1. Check the condition of the vehicle and the rider’s Equipment before starting off.
2. Speed up slowly when just starting off.
3. Start in gear “1” to ensure safety.
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PRECAUTIONS FOR TURNING
1. Take care to slow down in advance conditions when turning
2. Lower your centre of gravity to reduce the risk of side rolling when turning
3. Do not shift gears when turning
PRECAUTIONS FOR ACCELERATION
1. Do not accelerate in the corner
2. Remember to shift gears after acceleration
PRECAUTIONS FOR SHIFTING
1. Pinch the clutch lever before shifting gears
2. Do not rev the engine when shifting gears
3. Do not shift gears in the corner
PRECAUTIONS FOR BRAKING
1. Use the rear brake as your first brake operation, if necessary, use hand brake as a supplement.
2. Check fluid lever in the brake fluid reservoir frequently
3. Replenish the brake fluid reservoir if necessary according with the procedure in the manual
PRECAUTIONS FOR STOPPING & PARKING
1. Slow down gradually to 0 and then stop, do not emergency brake without emergency.
2. Slowly lean the motorcycle to the left until its weight rests on the side stand.
3. Shift the gear to “Neutral” before stopping.
RECOMMENDED SERVICE / INSPECTION SCHEDULE
every 30 hours
every 20 hours
every 10 hours/after every race
1 hour after each ride
Check and charge the battery
●
●
●
Check the front disc brake
●
●
●
Check the rear disc brake
●
●
●
Check the front and rear disc brake discs
●
●
●
Inspect brake tubing for damage or leakage
●
●
●
Check the rear disc brake fluid level
●
●
●
Check the free-play of the brake pedal
●
●
●
Check the frame and swingarm
●
●
●
Check the swingarm bearing for wear
●
Check the top of the shock absorber
●
●
●
Check the shock absorber connecting
●
●
●
Check tire surface condition
○
●
●
●
Check tire pressure
○
●
●
●
Check hub bearings for loose
●
●
●
Check the wheel hub
●
●
●
Check for rim edge pulsation
○
●
●
●
Check the spoke tension
○
●
●
●
Check chain, rear sprocket, engine sprocket, guide sleeve and chain
●
●
●
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Check chain tension
○
●
●
●
Lubricate all moving parts (chain, handlebars, etc.) and check for smooth
●
●
●
Check the front disc brake fluid level
●
●
●
Check the free play of brake handlebar
●
●
●
Check whether the steering head bearing for loose
○
●
●
●
Check valve clearance cold :
Intake valve 0.10-0.15 < 0.05 or > 0.25
Exhaust valve 0.15-0.20. <0.10 or > 0.30
Every 5k
5000
miles
Check clutch
●
Change the gear oil Change the gear oil - Recommended every 2000-3000
miles. 2000 miles for aggressive off road riding and 3000 miles for easier trail
riding.
1hr
Change the paper oil filter with every oil change
1hr
Remove and clean oil strainer in petrol with every oil change
1hr
Check the clutch and throttle cables for damage and sharp bend
●
●
●
Check that the throttle cable is intact, free of sharp bends, and set correctly
○
●
●
●
Clean air filter and air filter tank
●
●
●
Check whether screws and nuts are tightened
○
●
●
●
Replace the fuel filter
3500
mls
/65
hrs
Check front and rear light fixtures
○
●
●
●
Final inspection: check whether the vehicle is running safely and conduct a test
○
●
●
●
○ One-off interval
● Periodic interval
ATTENTION：This table is for reference only. Please adjust the maintenance cycle of the
motorcycle according to the specific model and use situation.
WARNING：For the inspection, adjustment and replacement of the engine, please consult GPX Service
Centre to avoid damage.
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SUSPENSION SYSTEM
CHECK THE COMPRESSION AND REBOUND OF THE VEHICLE WITH THE RIDER ON
BOARD
To ensure the best driving characteristics of the vehicle
and avoid damage to swingarm, shock absorbers,
linkage and frame, the basic setting of the suspension
components must match the driver's weight.
The total standard rider mass of the GPX off-road
motorcycle is shown in the table below.
GPX450R FSE 75～85KGS
If the rider's weight is above or below the standard
range, the basic setting must be adjusted accordingly. A
small weight difference can be compensated by
adjusting the rear shock absorber spring preload, but if
the weight difference is large, the spring must be
replaced.
ADJUSTING THE COMPRESSION DAMPING OF THE REAR SHOCK ABSORBER
You can adjust the compression damping by adjusting the
chrome allen screw in the centre of the shock nut.
Turn counter clockwise to decrease damping(soft), or
turn clockwise to increase damping(hard).
Warning - Do not loosen either of the bolts on the
shock that are by the compression allen screw.
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ADJUSTING THE REBOUND DAMPING OF THE REAR SHOCK ABSORBER
You can adjust the rebound damping by adjusting the
screw with a flat bladed screwdriver.
Turn counter clockwise to decrease rebound
damping(fast), or turn clockwise to increase rebound
damping(slow)
MEASURE THE DISTANCE BETWEEN THE CENTER OF THE REAR WHEEL AND THE
REAR FENDER IN SUSPENSION
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