Honda CB125 K4
Introduction#
I did restore an old Honda CB125 K4 some time ago and I'm sharing some apsects of the restoration here. Most valuable is probably the documentation sections where I store all the files I found on internet over the time, including the Workshop manual and the parts list.
Fork seal assembly#
Assembling back the front fork may include changing the oil seals between the fork bottom and the pipe. the manual shop (see documentation) refers to the fork seal driver 07947-3550000 tool to this.
I used a 40mm PVC pipe meant for wastewater. You will need a tube longer than the fork pipe, about 1m. Drill a hole at one end of the pipe. This will be used to pull a ratchet strap trough. With the strap go though the fork bottom hole meant for the wheel axle. Adjust everything and use the ratchet to put the seal in position. Be sure to oil all the parts before.
Piston ring compressor#
In order to put back the pistons in the cylinders the manual shop (see documentation) stipulates the use of a tool named piston ring compressor 07954-2000000. As a remplacement to this tool that I don't have I've designed an equivalent object which is 3d printed. It makes it very convinient to put the pistons back as you have both hands free.
You can find the 3d files on my Makerworld profile.
Ignition timing oil cover#
If you want to precisely adjust the ignition timing you will need to use a stroboscopic timing light and you need to see the F mark and Advance mark of the generator rotor while the engine is running.
You will likely have oil everywhere as the generator rotor is partially immersed in the engine oil. To avoid a mess while doing the adjustment I have designed a 3d printed cover plate.
You can find the 3d files on my Makerworld profile.
Documentation#
I don't remember the sources from where I got all thoses files, sorry for not quoting them.