SOHC.co.uk Forums > CB750
750 K2 Strip & Rebuild - help please
Lobo:
Comments please…
Currently the wheels with SS spokes, which have been fine over the past 10 years, but notably 3 or so failures on the rear wheel in those spokes with the acute bend. Luckily these are the ones that are easily replaced by deflating the tyre enough to unlace the bad one and thread in a new…
Anyways, am planning to polish both hubs, and so will be dismantling the wheels.
Thoughts please on switching to Chrome spokes versus SS. Notably the bike will be ridden regularly, and that I live on the coast. Low maintenance and retaining good looks are key…
Ta.
K2-K6:
Engine looks good. For spokes I'd favour stainless with brass nipples and using molybdenum grease on threads to build and tension them.
Consider judging the load on the tight turn spokes in comparison to the less angled (are the breaking spokes the outside on hub) that may improve longevity for you as that doesn't seem that bad for current spokes in lifing terms.
Lobo:
Thanks Nige; some good advice and I’ll rebuild using SS and arrange a bit more pong than ping on the B Spokes.
Today’s question on the (K2) carbs.
(1) any tips to getting the top rubber seal out so that I can properly service / polish the carb top? (Pic #1)
(2) any tips on getting the polished strip concealing the choke mechanism out? Better still, does it actually need to come out to replace the mechanism? (Pic #2)
Ta…
Lobo:
Needing help form the Alchemists…. Ash, Nige etc.
Plating today, specifically Cobalt-Nickel onto carb fittings. All gone very well…. barring the ‘anchor’ bit that screws into the slider and holds the riser bar in situ. The red flag came up as I gave them a short acid pickle prior to the copper Ultra Strike plating… rather like dropping an Alker seltzer into a glass of water… ie a lot of fizzing.
So, the flash copper coat went on, but not great. I continued with the Cobalt Nickel, one piece came out fine, the other three a mess, with patchy black streaks. The plate obviously didn’t take.
I’m not sure of the metallic make up of these bits, tho’ they are magnetic. Not sure how to proceed tomorrow… any thoughts whether Zinc plating will take? If not, what next?
Thanks
Lobo:
One the plus side to the above post 90% of plating today was a great result. The pics say it all - even if the first two are upside down 🤦â€â™‚ï¸.
The cable pulley wheel was a real sod, in that it’s two plates riveted together, and sandwiching 50 years of oil. This, of course, felt the need to leech out in the plating, which set me back a day with streakings. An overnight soak in petrol, followed by multiple heated ultra-sonic bathes finally got me where it needs to be.
Do I enjoy it? Not a bloody bit - it’s an awful lot of prep, and in the case of the copper strike and Cobalt-Nickel they’ve to be done at 55C or so which just makes it a bigger logistical pita. This all said, I am appreciating the freedom the plating kits (ie inc Zinc) are giving me in that ANY bit of metal on the bike is now doable on my own terms; and if done methodically can be minimised to a point. The nice bit about the Cobalt-Nickel plate is that it’s the next best thing to a chrome look, and a whole lot cheaper & safer to do. Did the brake torque arm last week - @ 50yo looks just fine now.
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