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Honda CB750K5 Restoration by Royhall
royhall:
Having recovered from the setback of the crankcase break (thanks James) I have moved on with the strip down (Note: Strip down not teardown, this is not American Bubba ham fisted work. I hate those God awful Americanism's). Talking of God awful American, back to the bike. After the initial thoughts that it's not too bad, it is actually a bit of a mess. At some point in it's life it appears to have lived outside unprotected for an extended period. Nothing that can't be dealt with though so I will let the pictures tell the story.
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royhall:
One ray of hope, I have sent the clocks off to Pete Horton who says they are not too bad so that's a nice surprise. I have dealt with all this mess many times before on my other bikes but I don't think it has been all together on the one project. It is going to require a lot of new parts as some are too far gone to recover, so I think the initial estimate of 7k including the bike itself has fallen by the wayside. More pictures on the horror of it all.
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royhall:
Looking at the handlebar controls, the right hand side unit is actually broken on the casting so that will need replacing. I notice Silvers and Yamiya stock a remanufactured piece. Are they any good quality wise, and are they a good match for the originals. The left hand unit is intact but appears to be full of corrosion, but strangely, the controls still move okay although at this point I haven't had a multimeter on them. It may be repairable unless the pattern ones are good. Yamiya sell them as a pair at a not too bad price so I'm hoping you guys may have some good feedback on them. Alternatively, is there anyone out there that repairs these things at a reasonable cost.
The rims initially looked okay to re-chrome. Unfortunately they have very deep corrosion pits on the outer edges (not shown in the pictures) that I think will be far too deep to buff out. So that will be replacement DID rims required, fortunately they are available. The chain guard has damage behind the shock on top of where the indent should be. Looks like someone has fitted slightly wrong shockers at some point and at full travel they have been hitting the guard. I suspect the bike has been owned by some monster sized individual as the shocks are set to the hardest preload and the seat is squashed flat at the front. McDonalds anyone?
On stripping the front brake there was not a drop of fluid in there and everything is seized rock solid with both corrosion and the crystalised remains of the fluid. I think some new parts may be in order there as well. The wiring and electrical system is a total write off unfortunately requiring new harness and sub harnesses. Both water ingress and Bubbas attention with his Scotchloks and sticky tape for the multitude of extra lights and silly extra's have totalled the system.
I was going to replace the tank and side panels with Yamiya ready painted items, but on checking the tank it doesn't actually look too bad. So Friday next week were having a trip out to Preston to have the fuel tank and oil tank dipped and phosphated. I will decide when that's done on the fate of the tank but it does look solid. If that's the case it will be a good cost saving to get it repainted. It has had a bad custom job done at some point where they have filled the badge indents, hopefully its just filler as the dipping will take that out. The side panels have also been filled so they are scrap as dipping plastic ends in a soggy mess. It's a shame really as they are not broken.
The carbs look like they have been kicked around the car park along with loads of corrosion. They are seized solid. A replacement set is on it's way shortly (thanks again James) so hopefully a good set can be made out of the two.
More soon.
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heli_madken:
Sorry to hear about the engine Roy it is a bit of a lottery I think buying blind from the US, will the new engine with a different serial number make the process of registration a little trickier?
The bike itself reminds me a lot of my 550 which had sat outside in Scotland unprotected for a few years. With the exception of the carbs and engine I think most things you would have planned to change anyway, even the engine would have got a good working over so in my view it isnt too bad.
To me it all adds to the challenge and immense satisfaction when you have completed a beautiful bike.
I bought handlebar switches from here - https://www.cb-four.com/cgi-bin/shop/ and found them to be quite good quality, havent had any problems at all with them
Looking forward to updates
royhall:
Thanks for the tip Ken. I have had a ton of parts off CB-four.com over the years. They are another good source for parts and I especially like the fact that they list good used parts as well. Unfortunately on the switchgear issue they don't have the correct USA spec K5 pattern part switches, with the UK/European versions having the wrong markings. CMS have the correct ones but I am not sure of the quality. It would be nice if someone could recommend the CMS items as it would be an easy fix for a big problem.
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