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Joined: Oct 08, 2011 Posts: 7 Location: Wahington, USA
Posted: Mon Nov 14, 2011 8:07 pm Post subject: Removing CM91 Steering Head?
I need to remove the forks on my '66 CM91. The nut holding this all together is called a "top thread" in the service manual and calls for the use of a 36mm hook spanner. It has 4 grooves cut round the outer edge. I have tried a couple of other ways to grip the grooves but no luck budging the nut.
I see these Hook Spanners for sale but the are mainly for bicycles and look way to flimsy to work on this nut.
Does anyone have a suggestion or know where I can get a proper tool for this?
Joined: Nov 02, 2008 Posts: 1087 Location: New Zealand
Posted: Tue Nov 15, 2011 1:35 am Post subject:
The bicycle ones work just fine. Most of the Japanese machines I owned in the 70's and 80's had a Hook Spanner in the stock toolkit (usually much maligned by moto-journalists) that came with the bikes.
Joined: Oct 21, 2008 Posts: 159 Location: Michigan
Posted: Tue Nov 15, 2011 1:54 am Post subject:
Yes , I purchased mine at a local bicycle shop. That nut is used to apply a torque pre-load for the head bearings. Shouldn't be on very tight. Try tapping it off with a brass punch until you purchase a wrench.
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