Rear axle adjustor causing drive chain problems..

[Guest]

Hello everyone I need some help!

I have a crappy Chituma CG 125 which is an absolute joy to ride!

However it is in trouble and I need everyone's help to bring him back to life!

I noticed one day when I by mistake kept the rear brake on for too long while accelerating from being stopped that the bike lifted at the front a bit and I felt a jolt from the rear wheel. Suddenly the bike started making a large rattling noise and I parked as soon as I could to investigate. Upon getting my tool kit out opening up the compartment that houses the drive chain I discovered the chain was so loose that it was rattling against the compartment.

Upon closer inspection I noticed that the whole rear wheel was askew to the right and and that it had moved up the rear wheel adjustor on the left side so that the whole wheel veered to the right and caused the drive chain to be loose.

So I then loosened up the bolt on both sides of the wheel which I have marked with a red arrow, I aligned the wheel so it was straight and the drive chain was at the correct tension and then the holding one side of the bolt with a spanner tightened the bolt up from the otherside (with another spanner) as much as I possibly could so that the wheel was aligned and that drive chain at the correct tension.

So I patted myself on the back and next day was driving on it again with no problems. This is when disaster struck.

I noticed during the day that the rear wheel had changed position again after 30 minutes of riding, this time it had moved down the rear wheel adjustor on the right (it had not moved on the left side), again causing the wheel to skew to the right but this time causing great tension on the drive chain. I only just managed to get home before the drive chain came off and I had to roll the bike home. I have not opened the tool kit yet to open the housing to see if the drive chain has just come off or if there is more damage.

My question is this. What am I doing wrong? And how do I fix this rear wheel axle adjustment so that it no longer moves. This has happened twice now and both times I have been lucky enough to be near my home if it happened anywhere else I would be done for!

My grandfather who was a motorcycle mechanic, told me over the phone it could be to do with the rear wheel stabilisers? What are they, is this the bit that comes of the main screw for the axle? I think one side is missing the screws to this.

Any help would be appreciated, thanks.

[Guest]

If you look at you wheel form the side, you can see the spindle arrowed..

if you look to the rear of the spindle running horizontally to the ground there is a chain adjuster, I think this is what your old man is on about and its where I would start.

these adjusters are used to create the reuired tension on the chain and if ill fitted or omitted you will have problems.

check that the adjusters are tight and located into their respective slots, when you realign the wheel.

[Guest]

Check the torque settings for the axle nut, sounds like your just nipping it up and no where near tight enough. I would try and use a long straight edge rather than the marks on the frame to align the wheel, i used to have a Honda CG125 and those marks for aligning the wheel were crap, the bike was crabbing down the road.