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#80cc bicycle motor installation how to#
#80cc bicycle motor installation full#
#80cc bicycle motor installation trial#

NOTE: The rear engine mount must always be at right angles to the seat stay Spacers and longer mounting studs are available from retailers. Adding rubber pads (about 1/ 8” thick) helps reduce engine vibration and helps the mounts to grip the frame.

Rework the mounts so they are a good fit in the frame.

Mount the motor high enough in the frame to clear any controls or brackets on the Seat Stay (see image above right and center). If the front tube is larger in diameter a large tube mounting kit for tube diameters up to 3″ are available from bicycle motor retailers and hardware stores.

It is best to mount the motor as far forward as possible.

The carburetor needs to be horizontal or tilted up or down to a maximum of 10° (see image).

Usual pitfalls when installing the motor. The following guidelines will help you avoid the Note: It is rare that the motor will go straight into the frame. It needs to clear the ‘down tube’ and not be struck by the LH pedal.

#80cc bicycle motor installation trial#

Also remember to check the drive chain alignment and do a trial fit of the exhaust pipe. Put the carburetor assembly temporally in place to check for clearance of the air filter and the throttle cable. Offer the motor up to the frame to make sure it will fit. Secure mounting the engine will prevent many problems developing when riding the bike.ġ.

#80cc bicycle motor installation how to#

This is the most important part of how to install a motor on a bicycle. You do not need to use much force to do this. If there is still some run-out, use a large shifting spanner to bend the section of sprocket giving trouble. If the rubbers are over tight there will be less “give” in the sprocket and a greater likelihood that you could pull spokes from the rim while riding. The rubbers provide a degree of shock absorption from the chain drive. If there is a gap between the two rubbers, tighten all the nuts evenly, until the rubbers are just touching.ĭo not over tighten the nuts. This will pull the sprocket back into alignment. A run-out of more than 1/ 2” may cause the chain to bind, jam or jump off the sprocket.Ĭorrect any side to side wobble by tightening the nuts where the sprocket is further from the spokes and slackening the nuts a little on the opposite side. Spin the wheel and check that the sprocket runs true. The nuts should now be tight enough to hold the sprocket firmly against the spokes but have some flexing in the drive direction.ġ0. Repeat this process twice more, checking the alignment as you go.

#80cc bicycle motor installation full#

Tighten the nuts and bolts 2 full turns in a criss cross or star pattern and check the hub alignment again and adjust if necessary Tighten the nuts and bolts another full turn moving in a star fashion across the sprocket.ĩ.

Use a block of wood and a hammer against the teeth to tap the sprocket into position, if necessary. Align sprocket and center hub so the gap is even all round. All nuts need to have the same amount of thread protruding.ħ.

Place washers and nuts on the bolts and tighten them so the assembly is loosely held together with light pressure on the spokes. Push the nine bolts through the sprocket, outer rubber, the inner rubber, and finally the support pieces.Ħ. Reversing the sprocket will provide a little more distance between the sprocket teeth and the spokes which can help the chain clear the rear tire.ĥ. Bikes with large tires may need to reverse the sprocket. Overlap the split of the inner rubber with one of the plates (see images). That is, the step on the teeth is towards the wheel spokes. Place the metal support segments against the rubber inside the wheel and the sprocket on the outside, with the teeth offset inwards. Place the other packing piece on the outside of the spokes.Ĥ. Place the cut packing piece inside the spokes.ģ. Cut only one of them between the drilled holes, as shown image.Ģ. Find the two rear sprocket rubber packing pieces.