E-Bike Viper Instruction Manual - page 22
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reduce fatigue. The height of the saddle and the handlebar changes upon
different riders. Normally, the saddle shall be adjusted until the rider can put one
foot on the ground (the whole cycle almost stands vertically) and the handlebar
shall be adjusted until the rider can stretch forearms comfortably and feel
shoulders and arms relaxed. However, it shall be ensured in advance that the seat
post and the handle stem are inserted over the safety lines for the adjustment of
the saddle and the handlebar.
2. Check and adjust the front and rear brakes before the electrically power
assisted cycle is used. The front brake is controlled by the right brake handle and
the rear brake is controlled by the left brake handle. The front and rear brakes
shall be adjusted until braking is achieved by the left and right brake handles
which reach half stroke. Replace brake shoes timely when abraded excessively.
3. Check the chain before the electrically power assisted cycle is used. It is hard to
ride when the chain is too tense and it is easy to vibrate or touch other
components when the chain is too loose. The chain slack shall be 1-2mm. It can
be properly tensioned if the cycle is not pedaled. When the chain is adjusted,
loosen the nut of the rear wheel and then evenly tighten or loosen the left/right
adjusting screw to adjust the tension of the chain. Then re-fasten the nut of the
rear wheel.
4. Check chain lubrication before the electrically power assisted cycle is used. Touch
and observe whether the chain axis rotates flexibly and whether chain links are
severely corrosive. If corrosion or inflexible rotation occurs, properly add
lubricating oil and if it is serious, replace the chain.
om5 B* p$
5. Before the electrically power assisted cycle is used, check the tyre pressure,
flexibility of the handlebar, flexibility of the front and rear wheels, circuit,
battery, motor, lighting, fasteners and others and ensure they are satisfactory.
(1)Insufficient tyre pressure will increase the abrasion between tyres and the
ground, which reduces the distance per charge; moreover, it reduces the
flexibility of the handlebar and affects the comfort and safety during riding. Add
pressure when it occurs and tyre pressure shall be consistent with suggested
pressure values in the Operation Instruction of the Electrically Assisted Power