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750 K2 Strip & Rebuild - help please
Trigger:
Not sure what year they started all the superseding from chrome to BZP as, in the UK we had long running models like the CB750 and CB500 four.
By the time the CB550F1 came out there was very few chrome fasteners on the bike.
The only bolts i can think of that were not changed to BZP was, the indicator M6 bolts, top yoke bolts, nuts, washers , handle bar mounting bolts and the disc mounting bolts ;)
You have also got all the different size nuts which may have the same thread but the A/F ( spanner size) were different. One of my pet hates was to see M8 bolts on the fork caps with a 12mm A/F when they should be 14mm A/F :o
Bryanj:
Trigger, the spanner size was because Honda used Japanese metric standards not ISO metric standard, you would have really hated the big tankers built in Japan, it was a nightmare after drydocking a German built one in Yokohama
Trigger:
--- Quote from: Bryanj on July 21, 2022, 08:20:07 AM ---Trigger, the spanner size was because Honda used Japanese metric standards not ISO metric standard, you would have really hated the big tankers built in Japan, it was a nightmare after drydocking a German built one in Yokohama
--- End quote ---
I know that it is all Japanese industrial standard Bryan, there are some M8 nuts with a 12mm spanner size and some with 14 mm spanner size. Also M10, 14mm spanner size and M10, 17mm spanner size, M12, 17mm spanner size and M12, 19mm spanner size and not forgetting many washer and nuts at different thickness ;)
Lobo:
All rather confusing for the restorer as the fastener Part # does not specify the bolt’s finish. This arvo I googled the common part # for the starter cover bolt (CB750, K1, K2), and was ‘shown’ very ordinary (Honda packaged) BZP bolts. How does one know what is right?
Moving on, I looked more closely at the Sandcast Starter motor cover plate, and noted it too (just) fails the feeler gauge check… ie there is a discernible 0.5mm gap. I’m beginning to reckon the plates are non-OEM as everything else looks correct and original.
In the case of the K2 rebuild, and the new Yamiya plate, I’ve ‘fixed’ the problem by adding a thick SikaSeal adhesive base to the packing seal, ie raised it 1.5mm. For now, it’ll do until I get to the bottom of the issue….
One last query; one starter cover plate is mirror chrome, and the other a brushed chrome finish. Which is original pls?
Oddjob:
One nut that seemed to retain the chrome look was the upper shock absorber cap nuts and the big thick washers behind them.
Another was the pinch bolt for the rear brake arm on the rear brake plate. Same for the gear lever pinch bolt, some changed but some retained the chrome one.
Some fasteners do use an identifier on the end, modern Honda JIS screws for instance can be identified when they are black and also when they have a captive split washer, for use on handlebar switch gear for instance.
Oh just thought of another chrome bolt, rear number plate bracket ones, the 4 which attach it to the guard, they tended to be chrome with chrome washers, as did the rear light ones come to think of it.
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