CB750 - 1970 - Top Yoke - The Evidence

[Mr_Sheene]

If this works and with me at the helm, there's no guarantee, there should be three pictures of the dodgy top yoke. Blasting has cleaned of the paint but some of the putty used to hide the damage under a layer of paint, together with the roll pins, can still be seen. I bought the one Eric identified on E-Bay USA earlier today for about £200. Apparently, the seller is known on the US site and is okay, so I'm hopeful. There again the bike seller was 100% on e-bay but thankfully, I've never seen him on this forum. The one I bought is supposed to be from a 1971 bike, which would be a K1 but although it's definitely the same as mine, I thought that the K1 had the first if the metal clock cases, with a different/later top yoke. Anybody want to buy a stylish paperweight?

[Mr_Sheene]

Told you. I learn best by failure and I know a lot!

[Nurse Julie]

What an absolute bodge..... Things like that make me so angry. The saving grace I suppose Phil is that you found out now and not when something awful had happen to you due to the bodge.

[SteveD CB500K0]

Classic case of over-tightening?


Sent from my iPhone using Tapatalk

[SumpMagnet]

BOTH ends of the top yoke fractured around the pinch bolts..... that's off a write off that smacked hard into something solid.

But held together with roll pins, and hidden under filler and paint.....thats plain stupid.

words...at this point...fail me.

potentially lethal if that hadn't been stripped and the bodge spotted

[JamesH]

BOTH ends of the top yoke fractured around the pinch bolts..... that's off a write off that smacked hard into something solid.

But held together with roll pins, and hidden under filler and paint.....thats plain stupid.

words...at this point...fail me.

potentially lethal if that hadn't been stripped and the bodge spotted

It doesn’t need to have been in an accident for the fracture to happen. I’ve seen these break on tightening even with the D washers fitted.

[Trigger]

Over tighten pinch bolts, with or without D washers, seen it thousands of times. They are pinch bolts and they only need pinching up 

[Mr_Sheene]

It's a write off either way but having done it once, what kind of idiot confirms that they're stupid by making the other side match?  Unless it was a shunt, in which case they appear to have come from another bike, as there's no evidence of frame damage on mine.

[Spitfire]

That is scary, good job you caught it.

Cheers

Dennis