Laverda 650/668 Top Yoke nut

pfhhh. - good question... I am pretty sure there is a tool for it, something of the ones below:

http://www.ebay.de/itm/Stirnlochnuss-Dorn-Gegenhalter-Stirnlochmutter-Zapfenschlusel-Spezial-Werkzeug-/131591237705?hash=item1ea372f049

http://www.ebay.de/itm/Stirnloch-Schlussel-Satz-Stirnlochmutter-Zapfenschlusel-Kfz-Spezial-Werkzeug-Set-/191145545784?hash=item2c81299038

 
Do you mean this one, Daniel?



In which case, the torque given in the factory manual (page N116) is ... "Manual"  :o.

Which I take to mean "Do it up as you deem fit, but not too tight",  I guess ... ::)
 
If it was notchy, it probably indicates a worn lower bearing (the one that is subject to the most stress transmitted from the road), even though it appears to have been overtightened. They are an item that wears quit commonly with use - they develop grooves in the straigh ahead position and always eek to self-centre.
 
Many years ago I had a small Kawasaki that because the lower 'head' bearings needed replacing, they were 'indexing' that bad that at very low speed in traffic progress was in a 'zig-zag' manner. Strangely this problem developed over a very short period of time.
 
The special tool to fit. It was on this Laverda forum a while ago.

Get 2 drill bits the same size as the holes in the "nut"
Drill 2 holes in the jaws of a 10" shifta (adjustable wrench)
Use the shanks of the drill bits through the shifta.

Worked fine for me..

There was a photo last time it came up on the forum.

Regards, Greg


 
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