nc31 project

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bludclot
Settled in member
Posts: 123
Joined: Sun Aug 31, 2014 6:50 pm
Bike owned: 98 R1, 95 CB1000, 92 CB400

Re: nc31 project

Post by bludclot » Thu Sep 12, 2024 2:30 pm

The seat came back from the trimmer so I have started using this bike, it's smooth and comfortable just as I remembered these to be.

The locks fitted each had their own key i.e. three keys for one bike. That's no good. MPW were selling half price lock sets, I was wary but for £15 thought I would give it a go. Here's the old locks:

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Fitting was straight forward but I found some 'creative' wiring behind the headlight and discovered the headlight itself to be held to the rim with a single (loose) fixing at the top. It's clearly been down at some point and bodge repaired, seems to be the way with these bikes. I can't find a decent original headlight so an aliexpress special is on its way.

Some other parts have arrived too, the mirrors were similarly cheap so I thought I would give them a go too:

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and they work quite well, surprisingly.

Tyres are here too:

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and there's a booking at the paint shop for wheels to be painted, new tyres and bearings fitted in the original matt grey. The body work will be refreshed at the same time, the same red is most likely.

bludclot
Settled in member
Posts: 123
Joined: Sun Aug 31, 2014 6:50 pm
Bike owned: 98 R1, 95 CB1000, 92 CB400

Re: nc31 project

Post by bludclot » Sun Feb 02, 2025 4:16 pm

This is now on the road and in use. It came apart as much as was needed:

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Brakes - all three calipers were stripped and cleaned and new parts ordered as necessary, rear disk, stainless pistons, seals, rubbers, pins, braided lines, fluid and master cylinder kit were all carefully re-assembled, they are now very sold at the levers and stop the bike beautifully.

Suspension - Ohlins shocks replaced the tired Hagons, I have collected a pair of fork legs and new bushes and seals, I shall send the legs for re-finishing any day now and, once returned, refresh the forks.

Wheels and tyres - new paint went on the wheels along with new bearings and the tyres pictured above, it rolls very smoothly.

Bodywork - re-painted in Honda Italian red. Both side panels were broken at their top mounts as they tend to be so a couple of Chinese panels were given to the paint man with tank, tail and mudguard.

Mechanics - carbs were removed, float valves, jets and gaskets were replaced as were both throttle cables as the shut cable that came on the bike was snapped. The choke cable was frayed at the lever end so this was renewed too. All service items were replaced as were the fibre clutch plates. It starts on the button, purrs like a kitten and goes like it should, all very satisfying.

Controls - the flash button didn't work and both switch housings had their locating pins filed smooth to fit the Renthal bars when the bike came. Ebay helped with good housings from a CB750 (the same as NC31) and some working NC31 inners so I sat and made a good pair out of those collected. A copy chrome handlebar needed drilling to accept the switch housings in their correct positions and, after much work for many hours, it was all re-assembled and works well.

Other bits and bobs - a plastic copy headlight went on. It's cheap and flimsy and I don't like it much but it's not accident damaged like the one the bike came with. All four indicators were replaced, the grab rails were powder coated, a Renthal rear sprocket went on, various fasteners were replaced (or fitted, some were missing!) and everything was thoroughly cleaned and lubricated.

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There's a few areas that I would like to improve - the clocks seem to over read and the temperature gauge doesn't move, I suspect that they are Chinese, I would like to find a genuine set. The seat was recovered, the trimmer did an excellent job (as he always does) but it had previously been cut away to make it lower and the new shape isn't as comfortable as I remember so an untouched seat foam would be great to find.

mechannibalism
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Posts: 42
Joined: Fri Sep 21, 2018 10:12 pm

Re: nc31 project

Post by mechannibalism » Mon Feb 03, 2025 1:50 am

Nice work, Looks great!! you should be proud.

yaaarp
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Posts: 3
Joined: Mon Jul 03, 2023 5:32 pm

Re: nc31 project

Post by yaaarp » Fri Feb 07, 2025 6:34 pm

Great thread, It made me happy to get to the end and find its still active! I also have a yellow nc31 that ive been using to commute for a couple of years, its my first big boy bike, and im loving it. unfortunately its a bit worse for wear and recently blew over during the storms weve had, so is currently off the road while i replace the parts that broke. I cant wait to get a wee lock up or something and properly strip it and give it the love it deserves, even with its rusty edges and flaky pain it still gets compliments and turns heads.

P.S. I love the CB1000!

yaaarp
Settled in member
Posts: 3
Joined: Mon Jul 03, 2023 5:32 pm

Re: nc31 project

Post by yaaarp » Fri Feb 07, 2025 6:36 pm

P.P.S, who do you use for your OEM parts?

Foxy400
Regular Member
Posts: 524
Joined: Mon Sep 02, 2013 7:31 pm
Bike owned: NC35 NC29 Bonneville CBR600F4i
Location: Cheshire

Re: nc31 project

Post by Foxy400 » Sun Feb 09, 2025 3:37 pm

It's looking good, well done, that's another one sorted. Now surely you've got another project or two lined up...?

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