GMX MOTORBIKES HAMMER DUNE, User Manual

PRE-RIDE INSPECTION

Chain

 – Check the general condition of the chain. If the chain is worn, check 

the condition of the drive sprockets. Adjust chain slack and lubricate if 

necessary.

Throttle Pedal 

– Check to see that the throttle pedal operates correctly. The 

action must be smooth and responsive, and must spring back to idle position 

when released. If this is not the case, have the product inspected by a 

qualified professional.

Fittings

 – Check the tightness of all fittings and bolts, especially the fittings 

around the steering, wheels and chassis. If you are unable to do this, have the 

product inspected by a qualified professional.

Lights 

– Check that head and tail lights are in full working order. Repair or 

replace if necessary. If you are unable to do this, have the product inspected 

by a qualified professional.

Switches

 – Check the operation of all switches. Have the product inspected 

by a qualified professional if necessary.

Tyre Pressure 

– Use an accurate, low pressure tyre gauge. Inflate only when 

tyres are cold where possible. Inflate to appropriate pressures as indicated on 

the sidewall of the tyre.

Tyre Wear 

– When tyre tread is at 3mm of height, tyres must be replaced. If 

you are unable to do this, have the product inspected by a qualified profes-

sional.

Engine Break-In

There is never a more important period in the life of your machine than the 

period between zero and 20 hours.

For this reason, we ask that you carefully read the following material.

Because the engine is brand new, you must not put excessive load on the 

engine for the first several hours of operation. During the first 20 hours, the 

various parts in the engine wear and polish themselves to the correct 

operating clearances.

During this period, prolonged full throttle operation or any condition which 

might result in excessive engine heating must be avoided.

However, momentary (2-3 second maximum) full throttle operation under 

load does not harm the engine. Each full throttle acceleration sequence 

should be followed with a substantial rest period for the engine by cruising at 

lower r/min so the engine can rid itself of the temporary build-up of heat.

If any abnormality is noticed this period, consult your dealer.

0-10 Hours

- Avoid continuous operation above half throttle. Allow a cooling off period of 

five to ten minutes after every hour of operation. Vary the speed of the 

machine from time to time. Do not operate it at one set throttle position.

10-20 Hours

- Avoid prolonged operation above 3/4 throttle. Rev the machine freely 

through the gears but do not use full throttle at any time.

After brake-in

- Avoid prolonged full throttle operation. Vary speeds occasionally.

Operation

WARNING:

 Prior to operating the Fun-Kart, review the assembly instructions 

to make sure the Fun-Kart has been assembled properly.

Operating Controls

WARNING 

- DO NOT attempt to start or operate this product until you are 

completely familiar and understand the user manual and product, including 

the locations of each operation control.

You must know how to stop this product before you start it.

Check throttle assembly to make sure it is working smoothly and returns to 

idle when released.

Check brake system to make sure it is working properly before starting 

engine.

Check the engine stop switch to make sure it is working properly before 

operating the product.

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