Honda S90 Rear Shock Tool

This page gives some details for a homemade tool to aid dismantling of the Honda rear shock absorbers.

Compression tool

The drawing on the right (click for larger image) gives the dimensions for a suitable tool to compress the Honda shock absorbers.

The drawing above (click for larger image) gives the dimensions for a suitable tool to compress the Honda shock absorbers.

This image shows the top plate being bored on the lathe. The final hole diameter was 46mm.
The wooden backing was used to protect the faceplate and two 12mm bolts were used to secure the steel plate to the faceplate.
Finally a cork protection strip was glued in place under the top plate to avoid damaging the plastic shroud.

The bottom plate had the same 2 holes drilled for the 12mm threaded rod. It also had 2 bits of steel angle bolted to it to form a 'U' shape support for the bottom of the shock absorber.

The 'U' shape was drilled 12mm through, to take the lower support dowel.

This photo shows the tool in use.
When the spring was compressed access was gained to the lock nut at the top, enabling the top mounting point to be removed and then the shock absorber could be dismantled.

It was found that when the spring compressed, the top mount had to be pulled out to expose the lock nut. The tool could be improved by adding a third plate to the top which, would be the same as the bottom plate. This would allow the top mounting point to be extracted precisely using the same 12mm threaded rod, rather than having to pull it out manually.