CB-1 Mk2

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CMSMJ1
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Bike owned: NC30-No9, NC27
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Re: CB-1 Mk2

Post by CMSMJ1 » Thu Mar 15, 2018 10:57 am

jim157 wrote:
Wed Mar 14, 2018 9:32 pm
CMSMJ1 wrote:
Wed Mar 14, 2018 4:28 pm
jim157 wrote:
Mon Mar 12, 2018 5:33 pm
Is there much difference between a mk1 and a mk2? I always fancied a cb1....
I'll flog you a cheap one.... ;)
I didn't realise you had one?
Stashed in container - was cheap to me and I "swapped" it with my mate, who doesn;t want it - so if it was sold I would get some space back in my container and he would get some cash - winning! It is..errmm..rough. And so if you wanted it...cheap! Was used for LDD and so has pedigree but I;ve no desire to sort it - so, when should I drop it off?
IMPERATOR REX ANGLORUM

The V4 is the law..

NC30 - No9 > My old mate
2005 ZX10 C1H - It is a beast
KTM Duke 390 - for shits and giggles

CB1pod70
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Re: CB-1 Mk2

Post by CB1pod70 » Thu Mar 15, 2018 12:39 pm

CMSMJ1 wrote:
Thu Mar 15, 2018 10:57 am
jim157 wrote:
Wed Mar 14, 2018 9:32 pm
CMSMJ1 wrote:
Wed Mar 14, 2018 4:28 pm


I'll flog you a cheap one.... ;)
I didn't realise you had one?
Stashed in container - was cheap to me and I "swapped" it with my mate, who doesn;t want it - so if it was sold I would get some space back in my container and he would get some cash - winning! It is..errmm..rough. And so if you wanted it...cheap! Was used for LDD and so has pedigree but I;ve no desire to sort it - so, when should I drop it off?
And once you've made a list of parts required, let me Know :grin:

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jim157
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Re: CB-1 Mk2

Post by jim157 » Thu Mar 15, 2018 9:53 pm

I wish I had the room but I've already got a couple of projects that have gone nowhere in a few years....
AUTOEXEC.TWAT

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CMSMJ1
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Bike owned: NC30-No9, NC27
Location: Chesterfield, United Kingdom
Re: CB-1 Mk2

Post by CMSMJ1 » Thu Mar 15, 2018 10:01 pm

jim157 wrote:
Thu Mar 15, 2018 9:53 pm
I wish I had the room but I've already got a couple of projects that have gone nowhere in a few years....
I'll see about dragging it to Cadwell for you.... no need for thanks :whistle:
IMPERATOR REX ANGLORUM

The V4 is the law..

NC30 - No9 > My old mate
2005 ZX10 C1H - It is a beast
KTM Duke 390 - for shits and giggles

CB1pod70
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Re: CB-1 Mk2

Post by CB1pod70 » Tue Apr 10, 2018 4:08 pm

Ok so this one got off to a bit of a false start and with the weather we had in February & March, I did struggle to build up the enthusiasm to head out into the garage. When I have been there, it was to work on other bikes.

Race season has approached pretty quickly so the NC23 race bike has taken priority and needed a replacement gearbox to solve the problems with jumping out of 5th. Unfortunately to get at the gearbox means stripping down the whole engine and you end up with this
ImageDSCF0780 by pod_70, on Flickr

and plenty of work to put it all back together again

Interestingly enough, the gear clusters (and ratios) for the NC27 & NC23 are the same despite the 27 using a 17" wheel and the 23 an 18". The only difference between the engines is therefore the cylinder heads & carbs, a lightened clutch basket in the 23 and the water pumps (the 23 has additional take-offs for the oil cooler behind the oil filter which is missing on the NC27)

I took the NC23 for it's first test run at Lydden Hill 2 weekends ago and it seems to be running great. Not the best circuit for testing as it's only 1 mile long and you only really use 2nd, 3rd & 4th but the session the previous weekend at Snetteron was cancelled due to snow on the track!

Whilst there I bumped into our very own Bikemonkey and much fun was had by all :grin:

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Re: CB-1 Mk2

Post by CB1pod70 » Tue Apr 10, 2018 4:09 pm

I had nothing planned for the Easter break so now that the race bike is up and running, what better than to crack on with the NC27?
Well Friday was taken up with a few odd jobs on the NC23 and sorting out the van ready for it's service on Saturday (there were jobs that I knew the garage would contact me about to add as extras to the service, so I figured I'd do them myself to save a few pounds).

The Van came back from the service with an advisory on the brakes so needs new pads, front discs, rear shoes & rear slave cylinders are required. so these were duly ordered. My Dad also popped over for a visit so we went out for the day to the Royal Engineers Museum in Chatham and spent the day looking at tanks and other cool military stuff - well worth a visit if you're in the area.

Sunday - I finally made it into the garage and managed to pull the little 27 out of its corner :o The plan was to take apart the front end and so first off were the clip-ons. It would appear that Honda have borrowed these from another model (VFR750 perhaps?) and the lower locating lugs would foul the bolt for the top yokes so Honda have added an additional spacer

ImageDSCF0785 by pod_70, on Flickr

The top yoke came off and the list of damaged parts slowly revealed itself:
Clocks (not enough remaining to bother photographing)
Headlight
Headlight Frame, Rubber Top Hats & Alloy Brackets
Choke Lever
Clutch Cable
Clutch Lever Mount
Grips (these were pretty grubby and worn anyway)

ImageDSCF0786 by pod_70, on Flickr

CB1pod70
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Re: CB-1 Mk2

Post by CB1pod70 » Tue Apr 10, 2018 4:11 pm

Next job was to remove the forks and check the stations with a straight edge. These have survived the crash and thankfully are straight so that's one less thing to worry about thankfully. I'll check the length against another pair of forks but at a guess, I'd say they are about 25mm longer than those on a mk1. the fork oil didn't look too bad but I'll drain & replace this while I've got the forks out.

The steering felt a bit notchy so I pulled the yokes out and found that the bottom bearing was past its best and there were notches in the outer race on the top race so these had to go and a new set has been ordered.

ImageDSCF0783 by pod_70, on Flickr

Another casualty of the crash was the Ignition Barrel. A chunk has been taken out of the casing around the steering lock and it looks like someone has taken a screwdriver to the lock in the past.

ImageDSCF0791 by pod_70, on Flickr

A quick rummage through the spares stash soon turned up a replacement Chinese lock. Unfortunately the Chinese lock has a 2 pin connector and a bullet connector on the fan motor feed rather than the 3 pin connector on the Honda lock so I'll have to modify the wiring to suit

ImageDSCF0792 by pod_70, on Flickr

One of my pet hates is switchgear that moves around on the handlebars and for some reason, someone had cut the locating lug off of the L/H switchgear allowing it to rotate. I have no idea why they did this as the locating hole is in the clip-ons :x

ImageDSCF0788 by pod_70, on Flickr

I carefully drilled and tapped remains of the pin to take an M3 screw so that the head would now serve as the locating pin. The head is a little big bigger than the plastic pin so the hole in the clip-on was enlarged to suit

ImageDSCF0789 by pod_70, on Flickr

Whilst I was there I gave the switches a good clean and blast of contact cleaner.

As there isn't much else I could do until the replacement head bearings arrive, I treated the forks & bottom yoke to a quick rub down, prime and few coats of black paint. They had been painted over in the past and were suffering from quite a few stone chips.

ImageDSCF0793 by pod_70, on Flickr

All in all, not a bad days work

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Re: CB-1 Mk2

Post by CB1pod70 » Tue Apr 10, 2018 4:13 pm

Bank holiday Monday and as I was waiting on parts for the van, I was able to spend a few more hours on this. Obviously I couldn't do anything more with the front end so I moved back and set to on removing the airbox to reveal a rather grubby air filter element.

ImageDSCF0796 by pod_70, on Flickr

Although these are fairly readily available through the likes of Wemoto, CMSNL & David Silver spares for around £25, I decided to employ the patented Amorti foam replacement method and whilst it's been documented before, I'm sure the accompanying photos have been lost to Photobucket, so here's the procedure:

1). Take a Stanley knife and cut out the paper element
2). Using the Stanley knife and some sandpaper clean up the opening and remove as much of the remains of the paper element as possible. You won't remove it all as it is moulded into the plastic.

ImageDSCF0799 by pod_70, on Flickr

3). Cut a new element from a sheet of Filter foam. This needs to be a few mm bigger than the opening in the filter body so it can expand to fill any irregularities in the opening
4). Using some silicon gasket sealant, bond the short edges in place - this got a bit messier than I would have liked due to using an old tube of sealant but it's now not going anywhere.

ImageDSCF0800 by pod_70, on Flickr

After that the carbs were stripped ready for a dip in the ultrasonic cleaner and a new set of O-rings courtesy of Blair at LItetek. A few other parts were removed and the next job is to check the valve clearances


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