GMX MOTORBIKES X Series Assembly Manual
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GMX MOTORBIKES X Series Assembly Manual

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GMX X-SERIES DIRT BIKE
50cc | 150cc | 250cc
ASSEMBLY MANUAL
Read and understand this entire manual before riding!
DO NOT RETURN TO STORE!
NOTE: Manual illustrations are for demonstration purposes only. Illustrations man not reflect exact appearance of actual procduct.
WWW.GMXMOTORBIKES.COM.AU
PH: 1300 766 469 | Chrisco Support: www.gmxmotorbikes.com.au/chriscosupport

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Dave
July 17, 2025

How do I no if my dirt bikes a 2strokr or 4stroke and were can I get a wiring diagram for the 250cc model,electric start please

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Summary of Contents for GMX MOTORBIKES X Series

  • Page 1 GMX X-SERIES DIRT BIKE 50cc | 150cc | 250cc ASSEMBLY MANUAL Read and understand this entire manual before riding! DO NOT RETURN TO STORE! NOTE: Manual illustrations are for demonstration purposes only. Illustrations man not reflect exact appearance of actual procduct. WWW.GMXMOTORBIKES.COM.AU PH: 1300 766 469 | Chrisco Support: www.gmxmotorbikes.com.au/chriscosupport...
  • Page 2 CONGRATULATIONS ON YOUR GMX PURCHASE! This assembly guide covers basic step by step instructions to assist you with the assembly process. Products are always subject to further improvement, which will cause some di erence between vehicle and this manual, without further notice. We wish you happy riding. UNPACKING Please CAREFULLY remove all external box and metal frame packaging TIP: These parts can be sharp so when unpacking the packaging hand with caution.
  • Page 3 WARNINGS PLEASE READ AND UNDERSTAND ALL INSTRUCTIONS AND WARNINGS PRIOR TO ASSEMBLY AND OPERATING OF YOUR VEHICLE. WARNING: This product is powered by a 4 stroke engine and comes with transport oil in the engine. THE OIL NEEDS TO BE DRAINED AND REPLACED WITH MOTORCYCLE OIL 10W/40 or 10W/50 IS REQUIRED IF THE OIL CHANGE IS NOT PERFORMED YOU MAY INTERNALLY DAMAGE THE ENGINE AND CLUTCH AND VOID YOUR WARRANTY DO NOT USE MOTOR CAR OIL DO NOT USE OIL WITH FRICTION MODIFIERS...
  • Page 4 GMX MOTORBIKES WARRANTY Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
  • Page 5 IMPORTANT SAFETY INFORMATION This section presents some of the most important information and recommendations to help you ride your motorcycle safely. Please take a few moments to read these pages. This section also includes a special message for parents and location information for the safety labels on your motorcycle.
  • Page 6 IMPORTANT SAFETY INFORMATION DON’T DRINK AND RIDE Alcohol and riding don't mix. Even one drink can reduce your ability to respond to changing conditions, and your reaction time gets worse with every additional drink. So don't drink and ride, and don't let your friends drink and ride either. KEEP YOUR DIRT BIKE IN A SAFE CONDITION It's important to keep your motorcycle properly maintained and in safe riding condition.
  • Page 7 IMPORTANT SAFETY INFORMATION For your convenience, this DIRT BIKE comes with an ignition switch and key. Remove the key when the motorcycle is parked to help prevent unauthorized use. Your Dirt Bike was designed as a rider-only motorcycle. It was not designed to carry a passenger or cargo. A passenger or cargo could interfere with your ability to move around to maintain your balance and control of the motorcycle.
  • Page 8 IMPORTANT NOTES ABOUT SAFETY (1) All nuts/bolts/spokes need to be tightened before, during and after use. (2) The chain has to be adjusted correctly. (3) The swing-arm has to be checked and tightened before, during and after use. (4) Please note if the above points are not done, it will lead to misalignment, causing the chain to come off. WARRANTY The dirt bikes are sold as off-road or enduro competition motorcycles and they will require a high level of care and maintenance.
  • Page 9 MAINTENANCE Proper maintenance is necessary to ensure that your motorcycle will continue to have low emission levels. Those items identified by the periodic maintenance chart are necessary to ensure compliance with the applicable standards. The owner of this motorcycle has the responsibility to maintain their vehicle according to the instructions in this owner’s manual.

  • Page 10: Table Of Contents

    TABLE OF CONTENTS GENERAL INFORMATION ........Drive chain ............Location of parts ..........Handlebar ............Fuel ..............Brakes ..............Fuel requirements ..........Front brake pad replacement ......Engine kill switch ..........Rear brake pad replacement ......Steering ............... Starting the engine ..........Moving off ............

  • Page 11: General Information

    GENERAL INFORMATION Location of parts 1. Clutch lever 2. Fuel tank cap 3. Front brake lever 4. Engine kill switch 5. Handlebar 6. Throttle grip...
  • Page 12 GENERAL INFORMATION 7. Brake hose 20. Silencer 8. Front fork 21. Seat 9. Fuel tap 22. Fuel tank 10. Drive chain 23. Right tank fin 11. Swing arm 24. Rear brake disc 12. Front brake disc 25. Rear brake caliper 13.

  • Page 13: Fuel

    GENERAL INFORMATION Fuel tap Fuel cap To open the fuel tank cap (A), turn the tank cap The fuel tap has two positions: ON (A) and OFF (B). counter clockwise. For normal operation turn the fuel tap to the ON position.

  • Page 14: Fuel Requirements

    GENERAL INFORMATION ⚠ WARNING CAUTION Petroleum is extremely flammable and can be If engine ‘knocking’ or ‘pinging’ occurs, use a explosive under certain conditions. Always stop different brand of petrol of a higher octane the engine and do not smoke. Make sure the rating.

  • Page 15: Engine Kill Switch

    GENERAL INFORMATION Engine kill switch Starting the engine The engine kill switch is located on the left side Shift the transmission into neutral by of the handlebar. This can be used for the pushing the shift pedal down into neutral normal engine shutdown or emergency engine until the motorcycle rolls freely.

  • Page 16: Starting The Engine

    GENERAL INFORMATION Starting the engine Starting the engine Choke Electric start models With cold engines, use the carburetor Pull in the front brake lever, then press choke lever (A), lift upwards for choke ON. the start button located on the left side of the handlebar....

  • Page 17: Moving Off

    GENERAL INFORMATION Starting the engine Moving off Kick start Geared models Engage clutch fully. Shift into 1 gear. Open the throttle slowly. Release the clutch slowly. Automatic models Open the throttle slowly. Using your foot, push the kick start (A) downwards with speed....

  • Page 18: Changing Gear

    GENERAL INFORMATION Shifting gears Stopping the motorcycle Close the throttle completely. For maximum deceleration, close the throttle and apply both front and rear brakes. Independent use Engage the clutch fully. of the front or rear brake may be advantageous in Shift into the next higher or lower gear....

  • Page 19: Daily Pre-Ride Checks

    GENERAL INFORMATION Daily pre-ride checks Check the following items each day before you ride. The time requirement is minimal, and habitual performance of these checks will help ensure a safe reliable ride. If any irregularities are found during these checks, refer to the appropriate section and take the action required to return the motorcycle to a safe operating condition.

  • Page 20: Break-In Period

    GENERAL INFORMATION Break-in period Break in periods are set out in the service schedule at the rear of this book. This is the period that is set for any new motorcycle to gently bed all of its new components. If the motorcycle is not used carefully during this period, you may very well end up with a ‘broken down’...

  • Page 21: Maintenance And Adjustment

    MAINTENANCE AND ADJUSTMENT The maintenance and adjustments outlined in this chapter must be carried out in accordance with the periodic maintenance chart to keep the vehicle in good running condition. The initial maintenance is vitally important and must not be neglected. With a basic knowledge of mechanics and the proper use of tools, you should be able to carry out many of the maintenance items described in this chapter although for warranty purposes we recommend periodic services are carried out by your supplying dealer.
  • Page 22 MAINTENANCE AND ADJUSTMENT The maintenance and adjustments outlined in this chapter are easily carried out and must be done in accordance with the periodic maintenance chart to keep the motorcycle in good condition and in-line with the warranty conditions. Off-road motorcycles Off road motorcycles typically cover only a short distance in their life but within this short distance they face much more severe and harsh conditions.

  • Page 23: Periodic Maintenance Chart

    MAINTENANCE AND ADJUSTMENT Periodic maintenance chart - Off-road models FREQUENCY Initial Every Page 2 hours 5 hours 50 hours OPERATION (1 month) (3 months) (12 months)    Engine oil & filter – change   Spark plug – clean, adjust gap † ...
  • Page 24 MAINTENANCE AND ADJUSTMENT Periodic maintenance chart - Enduro models FREQUENCY Initial Every Page 2 tanks of 10 tanks of 100 tanks of OPERATION fuel fuel fuel (1 month) (3 months) (12 months)    Engine oil & filter – change ...

  • Page 25: Engine Oil

    MAINTENANCE AND ADJUSTMENT Engine oil The major elements of your motorcycle's engine, the transmission and clutch system, require oil to function at optimal levels. You must change the oil and oil filter in accordance with the maintenance schedule or your engine will become damaged. Adherence to the required maintenance schedule will prolong the life of your motor and reduce wear and tear.
  • Page 26 MAINTENANCE AND ADJUSTMENT Oil level inspection (A) Oil filler cap with dipstick (B) Upper oil boundary mark (C) Lower oil boundary mark Oil maintenance procedure: Place the motorcycle on a flat work area. Wipe down the oil filler cap (A) and surrounding engine area. Start the engine and let it idle for a few minutes.
  • Page 27 MAINTENANCE AND ADJUSTMENT Changing engine oil (A) Oil drain bolt (B) Sealing washer Proper engine oil changing procedure: Warm up engine thoroughly, and then let sit for three minutes so engine oil can settle. Place motorcycle on flat work area. Place oil drainage pan beneath the motorcycle.

  • Page 28: Spark Plug

    MAINTENANCE AND ADJUSTMENT Spark plug The spark plug should be taken out in accordance with the periodic maintenance chart for cleaning, inspection, and resetting of the plug gap, measure the gap with a feeler gauge. If incorrect, adjust the gap to the specified value by bending the outer electrode.

  • Page 29: Valve Clearance

    MAINTENANCE AND ADJUSTMENT Valve clearance Valve and valve seat wear decreases valve clearance, upsetting valve timing. CAUTION If valve clearance is left unadjusted, wear will eventually cause the valves to remain partly open; which lowers performances burns the valves and valve seats, and may cause serious engine damage. Valve clearance for each valve should be checked an adjusted in accordance with table below.

  • Page 30: Air Filter

    MAINTENANCE AND ADJUSTMENT Air filter A dirty or clogged air filter causes a plethora of problems including poor air intake, low engine power, increased fuel usage and an increased incidence of fouled spark plugs. To clean and service the air filter please adhere to the following guidelines: 1.

  • Page 31: Throttle Grip

    MAINTENANCE AND ADJUSTMENT Throttle grip The throttle grip controls the throttle valve inside the carburetor, if the throttle grip has excessive play, this may be due to either cable stretch or maladjustment, this will cause a delay in throttle response, especially at low engine speed.
  • Page 32 MAINTENANCE AND ADJUSTMENT • Check if the throttle grip moves smoothly from full open to close, and the throttle closes quickly by the return spring and operates completely in all steering positions. If not, check the throttle cable routing, grip free play, and cable damage.

  • Page 33: Carburetor

    MAINTENANCE AND ADJUSTMENT Idling adjusting screw Open and close the Carburetor throttle a few times to make sure that the following procedure covers idling idling speed does adjustment which should be performed whenever not change. the idle speed is disturbed. Readjust if necessary.

  • Page 34: Drive Chain

    MAINTENANCE AND ADJUSTMENT Drive chain Handlebar The drive chain must be checked, adjusted, and To keep the handlebar properly secured in place, it is lubricated for safety and to prevent excessive wear. necessary to install the handlebar clamps correctly. lf the chain becomes badly worn or maladjusted - •...

  • Page 35: Brakes

    MAINTENANCE AND ADJUSTMENT Brakes Your motorcycle is equipped with state-of-the-art disc brakes both front and rear. The only procedure that you will need to execute is bleeding and replacing the pads. Proper maintenance (refer to maintenance schedule) will ensure safe conditions for your brakes by following these guidelines: Brake bleeding (front and rear) Your disc brakes require ‘bleeding’...

  • Page 36: Front Brake Pad Replacement

    MAINTENANCE AND ADJUSTMENT Front brake pad replacement To change the front disc brake pads on your motorcycle please adhere to the following guidelines: LEFT SIDE (A) Brake caliper-mounting bolts (B) Caliper assembly (C) Brake pad small (D) Brake pad large 1.

  • Page 37: Rear Brake Pad Replacement

    MAINTENANCE AND ADJUSTMENT Rear brake pad replacement To change the rear disc brake pads on your motorcycle please adhere to the following guidelines: RIGHT SIDE (A) Caliper assembly (B) Brake pad set Rear brake pad replacement procedure: 1. Remove rear wheel. 2.
  • Page 38 MAINTENANCE AND ADJUSTMENT Rear brake pedal ⚠ WARNING Rear brake pedal play inspection The brake play should have 20 - 30 mm when the Always maintain proper brake adjustment. If the pedal is pushed down lightly by hand. adjustment is incorrect this could cause overheating, brake drag and further damage to the brake assembly.

  • Page 39: Steering

    MAINTENANCE AND ADJUSTMENT Steering Steering adjustment The steering should always be kept adjusted so Raise the front wheel off the ground using a that the handlebar will turn freely but not have motorcycle jack (special tool). excessive play. The steering play must be Remove the front number board or headlight....

  • Page 40: Front And Rear Suspension

    MAINTENANCE AND ADJUSTMENT Front suspension Rear suspension The front fork oil change or the front fork The rear shock absorber inspection should be inspection should be done in accordance with done accordance with periodic the periodic maintenance chart. If there is any maintenance chart.

  • Page 41: Wheels And Tyres

    MAINTENANCE AND ADJUSTMENT Wheels Rim runout Set up a dial gauge on the side of the rim, and rotate Tyres the wheel to measure its axial runout. The difference Tyre pressure affects traction, handling, and tyre between the highest and lowest readings is life.

  • Page 42: Tightening Torques Of Nuts And Bolts

    MAINTENANCE AND ADJUSTMENT Torque of nuts and bolts Before the first ride of each day of operation, check the tightness of the nuts and bolts shown below. 15. Chain roller bolt 1. Brake disc bolts 8. Front axle nut 16. Rear shock mount bolt 2.
  • Page 43 MAINTENANCE AND ADJUSTMENT 19. Silencer mounting bolt 22. Chain adjuster bolts 25. Head stem nut 20. Front brake lever bolt 23. Swing arm shaft bolt 26. Front mudguard bolts 21. Rear axle bolt 24. Side stand bolt...
  • Page 44 MAINTENANCE AND ADJUSTMENT Description Unit (N.m) 1 bolts for brake disc 28 - 35 2 Tightening nut for front shock absorber (top triple clamp) 38 - 42 2 Tightening locknut for front shock absorber (lower triple clamp) 20 - 25 3 Handlebar clamp 20 - 25 5 Tightening nut for engine with frame...

  • Page 45: Cleaning Of Your Motorcycle

    MAINTENANCE AND ADJUSTMENT Cleaning your motorcycle Washing your motorcycle General precautions Rinse your bike with cold water from a garden hose to remove any loose dirt. Mix a mild neutral detergent (designed for motorcycles) and Frequent and proper care of your motorcycle will enhance its water in bucket.
  • Page 46 MAINTENANCE AND ADJUSTMENT Painted surfaces Chrome and aluminium After washing your motorcycle, be sure to coat painted Chrome and uncoated aluminium parts can be treated with a chrome/aluminium polish. Coated aluminium should be surfaces, both metal and plastic, with a commercially available motorcycle vehicle wax.

  • Page 47: Lubrication

    MAINTENANCE AND ADJUSTMENT Lubrication Drive chain lubrication Lubricate the areas shown in the illustrations of this Lubrication is also necessary after riding through rain section with either motor oil or regular greaser in or on wet tracks, or any time that the chain appears accordance with the periodic maintenance chart dry.

  • Page 48: Storage

    STORAGE When the motorcycle is to be stored for a period of time Remove the spark plug and spray fogging oil into the it should be prepared for storage as follows. cylinder. Kick the engine over slowly a few times to coat the cylinder wall.

  • Page 49: Assembly

    Pre-delivery inspection (PDI) If your bike has been supplied in a crate. This is NOT the same as buying a bike fully PDI’d (Pre Delivery Inspection) bike from a dealer. It is entirely your responsibility to ensure a reputable qualified motorcycle dealer puts your bike together correctly. Failure to do so will invalidate the 30 day parts only warranty supplied with your bike.
  • Page 50 Fit front mudguard using thread locking compound where required. Fit foot pegs if required and ensure free movement and spring back. Loosen rear wheel & adjust chain tension. Find tightest point in chain by spinning rear wheel, there should 13mm up &...
  • Page 51 Pre-delivery inspection (PDI) cont. Carburetor checks Tasks Tick  Some models may require you to set the carburetor needle height on second notch up from bottom for UK conditions. Be sure to check this if the engine does not idle/run correctly. Fuel the bike &...
  • Page 52 First service inspection Enduro models only - To be completed after 2 full tanks of fuel or one month, whichever comes first. Off-road models only - To be completed after 2 hours use or 1 month, whichever comes first. After the specified periods carry out the following checks & procedures: Tasks Tick ...

  • Page 53: Maintenance Record

    Periodic maintenance record See periodic maintenance chart for serviceable items Periodic maintenance service For warranty purposes to be completed by a reputable motorcycle dealership ONLY Motorcycle VIN number : Dealers stamp : Date : Company : Company address : Company telephone number : Technicians name : Motorcycle VIN number : Dealers stamp :...
  • Page 54 Periodic maintenance record See periodic maintenance chart for serviceable items Periodic maintenance service For warranty purposes to be completed by a reputable motorcycle dealership ONLY Motorcycle VIN number : Dealers stamp : Date : Company : Company address : Company telephone number : Technicians name : Motorcycle VIN number : Dealers stamp :...
  • Page 55 Periodic maintenance record See periodic maintenance chart for serviceable items Periodic maintenance service For warranty purposes to be completed by a reputable motorcycle dealership ONLY Motorcycle VIN number : Dealers stamp : Date : Company : Company address : Company telephone number : Technicians name : Motorcycle VIN number : Dealers stamp :...
  • Page 56 Periodic maintenance record See periodic maintenance chart for serviceable items Periodic maintenance service For warranty purposes to be completed by a reputable motorcycle dealership ONLY Motorcycle VIN number : Dealers stamp : Date : Company : Company address : Company telephone number : Technicians name : Motorcycle VIN number : Dealers stamp :...
  • Page 57 Periodic maintenance record See periodic maintenance chart for serviceable items Periodic maintenance service For warranty purposes to be completed by a reputable motorcycle dealership ONLY Motorcycle VIN number : Dealers stamp : Date : Company : Company address : Company telephone number : Technicians name : Motorcycle VIN number : Dealers stamp :...
  • Page 58 Riding tips for a long engine life Do not over rev your engine as you may cause damage to the valves. This is particularly applicable where an inner rotor kit is used. Under load the engine is capable of revving into major valve bounce that can cause permanent damage to your engine.

  • Page 59: Troubleshooting Guide

    Troubleshooting guide This troubleshooting guide is not exhaustive and does not give every possible cause for every problem listed. It is meant simply as a quick guide to assist you in troubleshooting for some of the more common difficulties. If not available within the below guide list, the repair should be done only by a competent mechanic following the instructions in the service manual.
  • Page 60 Engine overheating:  Brakes dragging, clutch slipping.  Blocked oil cooler, insufficient oil level, oil filter blocked. Clutch not operating smoothly:   Clutch slipping – Friction plates worn, clutch springs weak, clutch cable not routed correctly or faulty.  Clutch doesn’t disengage properly –...
  • Page 61 VEHICLE MAINTENANCE...
  • Page 62 VEHICLE MAINTENANCE - BEFORE YOU RIDE CHECKLIST SAMPLE PRE-OPERATION CHECKLIST Add to or adapt this checklist to suit your quad bike and place photocopies in a sturdy folder where vehicle keys and operator PPE are stored. • Maintain completed forms to provide a record of completed inspection and/or training. •...
  • Page 63 VEHICLE MAINTENANCE - BEFORE YOU RIDE CHECKLIST Drive chain and chassis Inspect chain for proper adjustment, wear and lubrication. Check drive shaft for oil leakage. Look and feel for loose parts with the engine o . Rough terrain will loosen chassis parts. Steering Check the steering moves freely, but without undue looseness.
  • Page 64 VEHICLE MAINTENANCE - MONTHLY CHECKLIST ROUTINE MAINTENANCE CHECKLIST Brakes Wheels Axle bearings and wheel nuts are tight Auxiliary brake Rims not dented or buckled Foot and hand levers adjusted – as per the Tyres are roadworthy, with adequate tread depth operator’s manual Tyre type and pressure as per the operator’s manual Check disc wear...
  • Page 65 VEHICLE MAINTENANCE - MONTHLY CHECKLIST ROUTINE MAINTENANCE CHECKLIST (CONT.) 4WD system Check, clean and regularly replace Constant velocity joints Exhaust Drive line and shafts Holes and corrosion Check for split boots on drive shafts Excessive noise Looseness Signals Lights Battery Horn Battery terminals –...
  • Page 66 VEHICLE MAINTENANCE...
  • Page 67 VEHICLE MAINTENANCE - BEFORE YOU RIDE CHECKLIST SAMPLE PRE-OPERATION CHECKLIST Add to or adapt this checklist to suit your quad bike and place photocopies in a sturdy folder where vehicle keys and operator PPE are stored. • Maintain completed forms to provide a record of completed inspection and/or training. •...
  • Page 68 VEHICLE MAINTENANCE - BEFORE YOU RIDE CHECKLIST Drive chain and chassis Inspect chain for proper adjustment, wear and lubrication. Check drive shaft for oil leakage. Look and feel for loose parts with the engine o . Rough terrain will loosen chassis parts. Steering Check the steering moves freely, but without undue looseness.
  • Page 69 VEHICLE MAINTENANCE - MONTHLY CHECKLIST ROUTINE MAINTENANCE CHECKLIST Brakes Wheels Axle bearings and wheel nuts are tight Auxiliary brake Rims not dented or buckled Foot and hand levers adjusted – as per the Tyres are roadworthy, with adequate tread depth operator’s manual Tyre type and pressure as per the operator’s manual Check disc wear...
  • Page 70 VECHICLE MAINTENANCE - MONTHLY CHECKLIST ROUTINE MAINTENANCE CHECKLIST (CONT.) 4WD system Check, clean and regularly replace Constant velocity joints Exhaust Drive line and shafts Holes and corrosion Check for split boots on drive shafts Excessive noise Looseness Signals Lights Battery Horn Battery terminals –...
  • Page 71 Notes...

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