Oil from breather pipe
Oil from breather pipeHi there,
I've just fired up my CA77 for the first time. The bike was bought at an auto jumble and I did strip the engine and examine it. Despite the speedo reading 14,000 it was on 1mm oversize Pistons so has done quite a few miles. The bores were OK, you could still see the honing marks and ring gaps were correct so they were left. I just changed the cam chain and reassembled the engine, after a short run there was a fair amount of oily vapour dripping out the cylinder head breather pipe. I'm kind of hoping that it's not excessive blow by causing this, can anyone advise please. One thing to check is that you assembled the plate on top of the head the right way around as it forms a labyrinth to separate oil from any air being pumped out.
https://www.cmsnl.com/honda-cl72-scramb ... SXwOcm1vpg Did you hone the bore at all to break up any glaze? New rings or old? Fit of valves in guides? 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
If the breather effluent is being caused by blow-by from the rings not seating, you may as well run the bike for a while to see if they bed in. Put a little catch bottle at the end of the breather tube and see how much is actually being spit out - a little mist is nothing to worry about.
Didn't over-fill the crankcase with oil by any chance? Valve guide seals not needed. Do what you've always done and you'll get what you've always had.
Thanks Nick and G man, I'll probably run it as suggested with a catch bottle for a few days. There was no smoke in the exhaust and I did only run it for about 10 minutes. I found another problem at start up, the fuel tap bowl had a pin hole in it and this leaked fuel all over the freshly painted engine, which I then found out was not fuel resistant so most of the paint ended up on the drive. Oh well.
Oil from breather pipe
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