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1967 CB450K0 Black Bomber Rebuild - By Royhall
royhall:
The next assembly is the cams and cam chain. After cleaning the cams I gave them a really good magnifying glass inspection. The inlet cam and followers are almost as new, but the exhaust cams are looking a little worse for wear. This is a common fault on these engines as the exhaust cam is the last point of delivery on the oil supply circuit so the exhaust cam can sometimes be starved of lubrication. I don't think I am going to risk reinstalling as they are as it's easier to remedy the situation now rather than when forced to later. As the exhaust cam is a weak point on this engine NOS parts are completely gone, however should the inlet cam ever go there are any number of new ones available. So this is a repair rather than replace situation.
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From a recommend on the forum I have contacted Newman Cams in Kent who have offered to repair the damage for me. They are going to regrind both cam lobes and either regrind the followers or weld a pad onto them and reprofile. So things are going to be held up again whilst the cams are returned. My fault as I should have checked the cams sooner.
The fuel tank is now ready to ship off to Menno for strip/lining/repaint. But first I had to remove a cap head screw and two hex self tappers that had been dropped into the tank and had jammed inside. The cap head was lodged between the outer and inner skin near the outlet spigot with the other two screws jammed underneath. Strangely they defied all efforts to get then out and were really in there tight. I had to make a special tool from a piece of stainless bar that I could use to get under the cap head and turn it with Mole grips. Thankfully it worked great and the screw popped out and released the other two. Couldn't get a photo of the screws as they were too deep inside the tank. The tank looks to be in pretty good condition if you ignore the paint, should turn out lovely.
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Also had a few parts back from chroming. I am not allowed to say on the forum who the chromer is as he does not want to be mobbed with work, think he may be semi retired. So sorry I usually like to pass on details of people who I have found to be good but this time I'm sworn to secrecy.
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At the minute I am trying to get the fuel tank completely finished and get all the pieces of the exhaust system in place. Two of the more expensive items out of the way.
Got some work to do on another engine for a while now so I will continue with this thread when Newman Cams send back the exhaust cam.
Laverda Dave:
Roy, did you manage to speak with Mike Newman in order to progress your work?
Chrome looks great. The plater I use has asked me not to reveal his details as he does bike chrome as a hobby from his main bulk order work.
I look forward to the next instalment.
royhall:
The good news is that the tank has arrived with Menno without damage, and only three days to get there all for £24.60 insured. I know you all have your favourites but I can't recommend Parcel Hero enough, never let me down yet. But I do always pick the DPD option with them.
Exhaust cams came back yesterday From Newman Cams. It took a total of 8.5 weeks to do the job after I had been promised 2-3 weeks at the outset. That said I think it was worth the wait as they have done an excellent job. I think it may have been easier if I had heeded the warning to ask for Mike Newman as advised by Laverda 120, instead I got Ken Newman who appears to operate in a state of complete chaos. Anyway we got there in the end. Job total including return post was £98, so well pleased with that as well. They reground both cam lobes and both followers for that price.
They now need a really good clean down all the oil galleries to remove any grinding debris that's bound to be in there. As I don't have a brush that tiny it will be lots of carb cleaner and compressed air I think
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Whilst they were away I spent a morning trimming down the dodgy NE gaskets that were protruding past the castings. It was a very slow tedious job with a new scalpel blade as they are next to painted surfaces. So not wanting to repeat this experience I checked the other gaskets still to be used and put them in the bin. I now have genuine Honda gaskets for the rest of the build. So that's yet another thing to check before starting the job, appears you can't really trust any pattern parts anymore. I thought the quality may have got better with greater demand but the opposite appears to be happening. There's an ex forum member sat up there on his cloud laughing his socks off. ;D Good old Bitsa.
I'm going to have to do a bit of reading up before I attempt to fit the cams as it's a bit of a strange arrangement. Can't be that hard to do though as Honda managed to do it at production line speed.
Sometime before Easter I am going to bring the rest of the bike from the lock-up and get it stripped down. After packing the tank off to Menno I was looking at having a go at the rest of the paintwork myself, but I was having a look at it yesterday and now I'm not so sure. Menno has given me some good advice along with a paint code, but I feel another large box to Germany coming on shortly. Ash is kindly repairing the very rare and hard to get Elephant Horn for me at the moment, any luck with it Ash and thanks for your help. Hopefully it will look like this when finished.
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Laverda Dave:
Glad you got the Cams back at last Roy. They have done a nice job, shame about the 8 week wait though! It certainly depends who you get I think, when the cb250rs blew up I sent the damaged cam to Newmans on the Tuesday and it was back with me on the Thursday! Worth the wait though for what you got back and the price.
I went to visit the DS museum last Tuesday for the first time, I do like the rugged look of the black bombers, maybe I should sell the Jota and downsize to something a bit more manageable and cheaper to run.
Personally, I would send all the paint to Menno I don't think anyone can match his quality of work especially when combined with piki's decals.
royhall:
--- Quote from: Laverda120 on April 06, 2019, 10:25:31 AM ---Glad you got the Cams back at last Roy. They have done a nice job, shame about the 8 week wait though! It certainly depends who you get I think, when the cb250rs blew up I sent the damaged cam to Newmans on the Tuesday and it was back with me on the Thursday! Worth the wait though for what you got back and the price.
I went to visit the DS museum last Tuesday for the first time, I do like the rugged look of the black bombers, maybe I should sell the Jota and downsize to something a bit more manageable and cheaper to run.
Personally, I would send all the paint to Menno I don't think anyone can match his quality of work especially when combined with piki's decals.
--- End quote ---
Okay you talked me out of it, just looking for an excuse to find a big box. ;D Wouldn't mind a Jota myself, but out of my price range now.
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