Vince,
Sorry to hear that you have issue's. As you know, I'm more into the 450 department these days and the cam looks like the CB450 left exhaust cam / rocker issue's. There are mainly two possible reasons for this.
- existing problems in the material itself (hardening issue's)
- breaking of the oil layer between cam lobe and follower
Breaking of the oil layer is caused by many reasons, too high pressure between cam and follower is one of them, the ability of the oil to stay between both parts another.
Not to proof anything, I started a test with a 10W60 full synthetic oil in my CB450 K0. With this test I'm trying to find a cure for this issue. Until now it seems pretty good, but it isn't the perfect solution either.
I suggest to go back to original, and enjoy what you have.
Japan Meets BritainClever and innovative guys, the Dutch!! :-)
G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F Chase
Yes - produced by a very clever guy from the Netherlands. I have some pages from his notebooks. With these (and other parts) came a full 500cc engine based on a CB72. Primary drive is by gears with and idler gear between crank and clutch. G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F
Vince
Wise decision. If you don't have the original provenance and documentation. you are probably in unknown territory. My Megacycle cams came with a matching set of rockers and instructions on how to sink th evalves into the head to avoid valve-valve contact. Stay with stock and you know what to expect.... G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160 '66 Matchless 350 '67 CL77 '67 S90 '77 CB400F
This has been a pretty lousy year for riding - I've been out on the SuperHawk for exactly one bona fide ride. The rest of the time it's been in the shop in one form of disassembly or another. I'm hoping that this will soon change!
I had trouble with the 'new' camshaft, and had to have that removed and reinstall the old stock camshaft. I've also replaced the voltage regulator, the electronic ignition (the Probe one was replaced with a Charlie's Place version), new battery (MotoBatt), new Kibblewhite CB350 valve springs from Bore-Tech, and Bore-Tech made us a set of teflon 'buttons' to replace the wrist pin clips (they also provided new wrist pins for us), plus a new set of rings. The new head was also re-redone. The chain guard has also developed a crack in it so that will have to be addressed at some point. Whew! This I'm pretty much 'done' with doing things to this bike. This has been a bad year for me for motorcycling - actually I shouldn't complain too much, as the first 12 years of ownership hadn't been really bad at all (though of course I had done a lot of work to the bike during that time). This year just seems to be particularly frustrating, as a bunch of things are happening all at one time. Hopefully that will change in the next week or two -- otherwise it's going to become a very expensive lawn ornament.
Last edited by Vince Lupo on Sun Sep 03, 2017 6:39 am, edited 2 times in total.
Actually I do have a question, if anyone is familiar with the Bore Tech 358cc pistons (Bore Tech is closed for the long weekend, otherwise I'd call them and ask): The pistons don't seem to have a 'direction' in which to install them like the stock Honda pistons (which have an arrow on top indicating which way to install them, plus one side of the top of the pistons looks definitely different than the other). John looked and looked and looked and he can't see any difference between the two sides of the Bore Tech pistons. Does that make sense????
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