SOHC.co.uk Forums > The Black Bomber Board
1969 CL450 US Barn Find Restoration
AshimotoK0:
--- Quote from: K2-K6 on February 14, 2018, 11:09:11 PM ---Just picking up on Laverda120 post earlier ( i wouldnt in this example here as the lobes area so good) but for others looking in its worth gaining the opinion of the indicated supplier to see what they could offer. Some of these services in the past have offered wildly varying results (I've no knowledge of that supplier though, so no reflection of their work) .
http://www.common-motor.com/Honda-CB350-CB360-CB450-CB500T-CB550-Rebuilt-Camshaft-Rocker-Arms
Found the above though which indicates some specialisation in these components, unsurprisingly if anyone has direct experience of them.
--- End quote ---
I believe Kettle738 has used Newman Cams in the past for CB450 cam parts and said they were OK.. Mick is fairly picky so I trust his opinion and I think I would use them if needed.
AshimotoK0:
If I am interpreting Jensen's reply correctly he is advising that you miss off the dampening rings on the exhaust cam because of the damage but says engine is noisier without them. Pity the metal can't be built up and machined but I am no expert on brazing chilled iron castings or if it's even a possibility. I have definitely seen CB250K sprocket mount lugs welded up though. I wonder if someone like Newman cams could advise. The USA Bubbas would probably build it up with JB Weld ;D ;D
MrDavo:
In that case I may look for another decent camshaft, there are a couple on the bay, the best ones are in the US, so subject to stupid carriage plus taxes, but I’ll keep looking.
I don’t want to build a noisy engine, it would bug the crap out of me. The alternative would be to build it with dampers but keep whipping the cover off to see if it is spreading, although they are a lot of work to install, they should be a 10 minute job to cut and pull out.
royhall:
If it was mine I think I would hold off on a cam replacement decision until the new damper rings arrive.....To my mind there's not much left to hold a very soft rubber ring in place. If they turn out to be a fairly hard rubber they may have enough integrity to hold in place....... But that said don't forget, even turning at half crank speed the cams are still fairly whizzing around, and with clearly brutal damage like that (looks like hammer rash from the photo) there could be hidden cracks that may lead to structural failure...... Although you could easily get the cam crack tested, my gut feeling would be to wait until something better comes up and change the cam for an undamaged item...... You have gone to so much trouble getting this engine mechanically and cosmetically perfect it would be a shame to compromise, and it's going to leave a nagging doubt in your mind.
AshimotoK0:
+1 Roy .. how about a quick call to Newman cams though Dave ? They must have seen damage like that or broken bits ... bet they have seen CB250/350K and if its any consolation that cam is really rare in decent nick compared with 450 even though they made a million of them.
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