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1967 CB450K0 Black Bomber Rebuild - By Royhall
Bryanj:
Did a few 500T motors, 450 was before even my workshop time. Same cam drive but without a proper chain riveting tool they are not easy to finish. The Honda one worked best but was expensive to buy and some of the cheaper ones were a bit big to get into the space.
AshimotoK0:
I will make sure I get on with the horn Roy :-[ :-[
Interested to see what type finish you choose on the silver painted cycle parts. I got a 'NOS in Honda box' front mudguard from Japan for my Bomber and the paint finish looks nothing like that on the 'show pony' restoration you mostly see with clear coated finish on top of a silver base-coat. The NOS guard has a flat satin like finish.
royhall:
Thanks Ash. I don't think the silver should be clear coated. My guess is it's done to provide some durability and protection from fuel spills etc. Would be handy if you could ask a paint supplier for a match to your new mudguard and get a paint code though (I think it may be Honda Cloud Silver CSB-195). I was thinking about doing the clear coat for the above reasons, would prefer to not do it twice due to a spill.
sye:
You can get clear 2k matt and satin lacquers.
royhall:
I'm back after a fair few unexpected problems with the Bomber engine. The project has been stalled since March and has been slightly frustrating.
I managed to get the exhaust cams and speedo drive gear together and assembled into the head. Used Graphogen and oil on the cam bearings to give it a chance whilst the oil reaches that high up into the engine. The oil also has to fill some quite large cavities on it's way to reaching the cams so may be a while waiting for forced lubrication. Looks like a new cam now Newmans have done the do.
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The inlet side I am not so lucky. This is a really strange problem, the bearing caps on the right hand side have a cast on marker for setting the cam timing. For some unknown reason some plonker has seen fit to file off the mark, why would someone do that? So once again Ash has saved the day and is lending me the cap from his bomber engine so I can re-mark my cap.
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What I shall do is fit Ash's cap and measure down from a fixed point then re-fit my cap and measure back from the point and scribe a line (does that make sense?). Including the packing and postage time this daft little problem has set the project back nearly 2 weeks. Weird the things that pop up on these old bikes.
Having got past the marker issue I got the inlet cam fitted okay. Now for the part I have not been looking forwards to, fitting the cam chain. If not already done, it is essential to fit wires to both ends of the cam chain and tie them off somewhere. If the chain should fall into the engine it's a top end strip down to retrieve it as it's a long way down to the crankshaft (unless you get very lucky with a long flexible magnet thingy).
The cam chain passes over no less than 7 guide wheels so it's pretty complex and awkward. The chain is best riveted from the inlet side as there is more room, so the chain needs to be lowered off the crankshaft and pulled through enough to pull it over the wheels to the back of the engine. The cam adjusters need to be slackened off to give the most space to turn the cams. With the crank set to the LT mark (left piston TDC) the cams need to be set to the markers on the right hand sides. The inlet cam turned by hand to it's mark but the exhaust cam required grips to turn it as it was coming onto the lobe at the correct position. The chain then has to be teased into a position where it can be riveted and a soft link rivet pressed into place. I fitted the like without the side plate and turned the engine until I could get the rivet tool in (not easy).
Having managed to set the chain link I turned the engine to back round to LT to check that the timing was correct. To my relief I got it first time.
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That's the worst part over with, Honda must have had an easy way set up to do that job on a production basis. I thought I was on the home run with this engine but little did I know that more problems were lurking in the shadows. One day maybe it will get finished who knows?
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