KAYOBA 009925 Mountain Bicycle User Manual

009925 Mountain Bicycle
User Manual

Important! Read the user instructions carefully before use. Save them for future reference. (Translation of the original instructions).

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SAFETY INSTRUCTIONS

IMPORTANT:
The maximum load including cyclist and baggage is 120 kg.

OWNER’S RESPONSIBILITY  on it) After adjusting, check that all screw unions are correctly tightened and that the wires are undamaged and correctly drawn along the frame.

DESCRIPTION

ASSEMBLY

Suitable tools for assembly and adjustment.

• Combination spanners, sized 74 (2) and 15 mm
• Hex keys sizes 4 and 5 mm
• Phillips screwdriver PH2
• Grease

HANDLEBARS

1. Unscrew the bracket on the stem with a 5 mm hex key. FIG. 2

2. Put the handlebars on the stem. Make sure that it is centered and has a suitable angle for the handbrake and gear levers, and that the brake and gear wires are on the right sides of the frame and front fork. If the wires are not properly positioned the handlebars or fork has turned and must be turned back before fitting the handlebars.
   FIG. 3

3. Screw together the bracket and tighten the two hex screws alternately.
   FIG. 4

FRONT WHEEL

1. Remove transport protection on the brake caliper, in the form of a small piece of plastic that separates the brake pads.
2. Put the wheel axle in the slots on the fork legs and align the brake disc to the brake caliper. Check that the wheel is straight, in the middle of the fork legs.
3. Close the quick-release lock and firmly tighten the adjusting nut on the opposite side.
4. Open the quick-release lock, tighten the adjusting nut another 3/4 turn, and then close it again Closing the quick release takes a little effort so that it does not open unintentionally and loosen the wheel.
   FIG. 5

SADDLE AND SADDLE POST
Grease the saddle post and insert it into the saddle tube, and then lock to the required height with the quick release.

IMPORTANT:
The marking for the top position on the saddle post should not be seen over the saddle tube.

PEDALS
The pedals are different and are therefore marked with “L” (Left) and “R” (Right) If they are fitted on the wrong side or screwed in skew in the crank arms this can damage the threads.
Grease the threads on the pedals before fitting. FIG. 6

Fitting the right-hand pedal (R)
Screw in the pedal clockwise on the chain side of the crank arm and tighten with a 15 mm combination spanner.
FIG. 7

Fitting the left-hand pedal (L)
Screw in the pedal anticlockwise, on the opposite side of the chain, and tighten with a 5 mm combination spanner.
FIG. 8

USE

SITTING POSITION
It is important that the saddle is correctly adjusted so that it is both comfortable and safe. The saddle should be horizontal and it should be possible to fully stretch out the leg with the arch of the foot resting on the pedal when the pedal is in its lowest position.

Adjusting the saddle
FIG. 9
Height
Open the quick-release on the saddle tube, move the saddle post to the required height, and close the quick-release.
IMPORTANT:
The marking for the top position on the saddle post should not be seen over the frame tube.

Position over the pedals
Put the sole of one foot on the pedal with the crank arms horizontal. Undo the nut holding the saddle to the saddle post. Adjust the position of the saddle forwards or backward until the pedal is directly under the knee. Very small adjustments to the position of the saddle can affect both performance and comfort Move the saddle a
bit at a time to find the best position. The saddle can also be angled to the required position. A horizontal saddle is often recommended.

GEARS
About external gears
On gear systems with external gears, the chain moves between the different sprockets on the cassette. You count the number of gears on the bike by multiplying the number of sprockets on the back wheel cassette by the number of chainrings on the chainset. You can change the gear ratio by using sprockets and chainrings with a different number of cogs. The highest gear is obtained when the chain lies on the large chain ring on the chainset and the smallest sprocket on the cassette. The lowest gear is obtained when the chain lies on the small chain ring on the chainset and the largest sprocket on the cassette. Thanks to a large number of gears you can ride in varying terrain and still pedal at about 60 rpm, which is recommended.

Changing gear
The left-hand gear shift is used to switch between the chainrings on the chainset. The right-hand gear shift is used to switch between the different sprockets on the cassette.  Avoid shifting the chain to its outer position (large front chain ring and large cassette sprocket or small front chain ring and small cassette sprocket). This avoids unnecessary wear, noise, and damage to the gear system.

Follow the instructions below when changing gear.

• Only change gear when the crank arms and wheels are moving forward.
• Do not force the gears.
• Do not change gear while pressing down hard on the pedals.
• Change gear in good time because you must pedal forward when changing.
• Change down to a lower gear before you stop. This makes it easier to start cycling again when you have low gear. Change gear in good time when you come to a steep slope so that you do not need to change when pressing down hard on the pedals.
• Do not pedal backward while changing gear

BRAKES
The bike has hydraulic disc brakes and two brake handles, one for the front wheel and one for the back. They are located on the two sides of the handlebars. The right-hand brake lever controls the front brake and the left- hand brake lever controls the back brake.

WARNING!
Do not ride the bike if the brakes are not working properly.

Safe braking
Brake a bit sooner with the back brake than with the front brake and never brake with the front brake when turning or on loose or slippery surfaces.

FRONT FORK
The front fork has a lockout function, which means it can be locked to act as a rigid front fork. This is useful when standing upright on the bike to ride up a slope. The lockout knob is on the right fork leg and switches on/off when there is no pressure on the front fork. FIG. 10

MAINTENANCE

GENERAL
Clean the bike regularly for best lifespan and functionality Use a mild detergent and avoid degreasing agents that can penetrate the bearings and chain and interfere with the lubrication. Store the bike in a dry place, protected from direct sunlight

CHAIN
Lubrication
The chain should be lubricated at regular intervals. A dry chain wears more quickly, is heavy going, and can rust.

1. Lubricate the chain with suitable chain oil.
2. Pedal a few turns so that the oil gets into the links.
3. Wipe the chain.

BRAKES
Adjusting
The hydraulic brakes are self-adjusting, but the brake caliper may need to be centered if the pads are rubbing against the disc.

1. Undo the two screws fastening the brake caliper to the front fork, a half turn should be enough.
   FIG. 11

2. Spin the wheel and brake hard.

3. Keep the brake handle pressed and retighten the screws.

Service and repairs
Take the bike to a bike shop to replace the pads, bleed or repair the hydraulic brakes.

GEARS
All the moving parts of the gear system must be kept clean and regularly lubricated for the gears on the bike to function properly for a long time. The derailleur should be lubricated with molybdenum grease or the equivalent.

1. Smallest sprocket on the cassette
2. Upper adjusting screw
3. Roller
4. Largest sprocket on the cassette
5. Lower adjusting screw
   FIG. 12

Adjusting
First, adjust the outer position of the chain and then the wire tension in the following steps.

Adjusting the outer position of the chain
Turn the upper adjusting screw for the gear mechanism until the roller is below the outer edge of the smallest sprocket on the cassette.

Adjusting the inner position of the chain
Turn the adjusting screw for the inner position of the chain on the back derailleur until the roller is directly under the largest sprocket on the cassette.

Adjusting the wire

1. Third smallest sprocket on the cassette
2. Next smallest sprocket on the cassette
3. Smallest sprocket on the cassette
4. Wire adjusting device
   FIG. 13

Switch over the chain from the smallest sprocket on the cassette to the next smallest.

• If the chain will not go onto the next smallest sprocket, turn the adjusting device anticlockwise to increase the tension in the wire.
• If the chain goes past the next smallest sprocket, turn the adjusting device clock­ wise to reduce the tension in the wire.

With the chain on the next smallest sprocket, increase the wire tension while turning around the crank arms. The adjustment is complete just before the chain engages on the third smallest sprocket.

TYRES AND RIMS
Check the tire pressures at regular intervals. The recommended tire pressure is given on the side of the tire Check at regular intervals that the tires are not worn or cracked.  Avoid contact with oil, petrol, paraffin, and other agents that dissolve rubber.
Regularly check that the spokes are correctly tensioned and that the wheels are not buckled or out of round.

HANDLEBARS, STEM, AND HEAD BEARING

FIG. 14

Handlebars and stem
If the handlebars are skew and need adjusting, undo the two retaining screws on the stem (that clamp round fork tube) with a 5 mm hex key. Align the stem so that it is in line with the front wheel and retighten the retaining screws.

Head bearing
Follow these instructions to adjust any play in the head bearing.

1. Undo the compression screw a little or a few turns with a 5 mm hex key.
2. Undo the retaining screws on the stem with a 5 mm hex key.
3. Screw the compression screw clockwise until there is no longer any play, but do not tighten anymore as this can damage the bearing.
4. Retighten the retaining screws.
5. Release the compression screw a half turn.

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