TDM850-900 : Tools

Steering head tool

When checking & adjusting the steering head, a special tool is theoretically required. This tool may not be easily available so having a replacement tool can be a good thing.
First you take an hollow tube, diameter 41mm external, 25mm internal. Minimum length is 60mm. You shape two square pins at one end with a grind tool and weld a 19mm (or more) nut at the other end. That's all.



Thanx to chris2bia (forum TDM Ouestlekeum) for the design & photo.


That tool apply tightening torque strait to the steering column axis. This is different with the Yamaha's steering nut wrench due to the axis offset. So you will have to lower the specified torque (about 10-15%) when using this tool.

Yamaha Co. recommends the following steps when adjusting the steering head (initial torques indicated) :
• Tighten lower ring nut to 5.2 m.Kg.
• Rotate steering head 6 times rim to rim.
• Loosen lower ring nut completely (360°).
• Tighten lower ring nut to 1.5 m.Kg.

Front fork : tool to loosen and tighten the damper rod holding bolt

For a complete disassembly of the front fork, it is necessary to maintain the damping rod while removing the holding bolt.

The Yamaha special tools (90890-01326 and 90890-01375) can be used, but they are rarely part of the usual tools of a non-professional.
No worries, these tools can easily be replaced. There are several solutions, the one I have adopted is simple to realize and low cost.

• threaded rod, diameter 20mm, sufficient length for the fork tube (min 1m)
• two 29mm nuts


The two nuts are locked very tightly so that the one in contact with the damping rod will not move when using the tool.
Insert the tool inside the fork tube and to block the damping rod, block the other end with a vice or any other mean.
An 8mm Allen wrench is then used with an extension to remove the lower retaining screw.


Other tools : share your ideas / pics...


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