SOHC.co.uk Forums > CB350/400

My New Project arrives after a 44 year wait!

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Matt_Harrington:
Dave, at least you found the yoke issue this way rather than some horrible accident when out riding. Great progress and it won't hurt to have a break....

magpie114:
Better to find out now about the yoke. I had the same sort of issue with taper roller bearings on my VFR. Various problems fitting them and then on my first outing I could feel something wasn’t right thro the bars which I couldn’t rectify. Replaced them with a standard Honda set which immediately cured it.
Have a few days off and enjoy BSB.


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Laverda Dave:
Yes Matt, at least I found this the easy way rather than have the front end come loose after hitting a pothole when riding! Interesting that you have found the same problems exist on more modern bikes as well Magpie, don’t these sellers realise they have to undertake some form of R&D before selling kits that are potentially dangerous and could lead to an accident!

I did contact Pyramid Parts when I found the kit they supplied didn’t leave enough top thread exposed and in my view it was potentially dangerous. They replied and gave me my money back and said they would investigate the problem ‘with restorers of these bikes’ and would be looking at fitting a stepped bearing as apparently they do for the Kawasaki KH series. I just checked their website and the same kit is still for sale with no stepped bearing listed. This topic has been discussed many times on the forum and yet the suppliers still churn out the same kits despite all the feedback.

I measured the length of exposed thread on the steering stem above the thick washer, it is 3mm. The depth of thread in the nut is 9mm. This is with a hybrid set up of a caged roller bearing fitted on the top and the 14.5mm taper bearing on the lower with a 2mm spacer and dust seal below the bearing (any less than 2mm and the yoke was binding on the lower steering flange of the frame). It was only 1mm with the top taper bearing fitted, there is no way that could be safe, that’s why I changed it to the caged bearing but I think the damage had already been done to the thread when the taper bearing was fitted and I torqued the nut up and found I could only get 1.5 turns of the centre nut.   I checked the Haynes manual again for the torque settings in case I made a mistake. The manual states a setting between 57-86lbs. I torque the nut up in stages starting at 20lb, then 30lb and that was as far as I got before the thread gave up.

Yes, a few days off from it would do me good.

Deano400:
Dave,

Steve at 400/4bits has a bottom yoke showing on his website.

Deano400:
Dave,

When you say one of the lock plungers is broken, do you mean the little spring loaded gates?
If so, you could post me the broken gate and I'll see if I have a matching one.

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