SOHC.co.uk Forums > CB750
Crankshaft bearing selection bulletins/ADVICE NEEDED
Bryanj:
I will be contraversial and say that if i am building an engine that is to sit for a while before use i have always used coppaslip (original version) turns the oil FUNNY COLOUR BUT NEVER HAD ANY PROBLEMS ON ALL THE hONDA AND eSSEX v6 THAT I BUILT
Bryanj:
Got from my Uncle who ran a real garage way back when, didn't mean to shout its this damn dyslexic keyboard that does wierd things when the batteries get low
AshimotoK0:
So do I Plastigage or not given that I am pretty sure my measurements were spot on as the guy that measured them is an old engineering 'sage' from the NEL ?
Must admit that the old SOHC four crank (a 400/4) I ever fitted new shells to, I didn't Plastigage and it was fine (the 400/4 crank and shells on my current 400/4 looked so nice I just left well alone and refitted).
Having said this the Honda shop manual specifically tells you to Plastigage and not to rely on measurements.
Ash
Trigger:
--- Quote from: AshimotoK0 on June 24, 2015, 10:13:55 AM ---
--- Quote from: Bryanj on June 24, 2015, 09:28:03 AM ---Ash, I was told that Honda built them as if they had clearances found after a running in period so that all they needed was bedding in so even if you fitted all black and simply run it in with extra oil and filter changes I am 99.9% sure you will be OK. The engine in No 36 was built with all black and was OK all the time till it got burnt---would still love some time with the culprit and a megger
--- End quote ---
How about all greens then Bryan, for mains instead of yellow, as described? I am using the crank & rods you sold me yonks ago from your infamous lock-up BTW :D It measured up pretty nice.
Ash
--- End quote ---
Ash I used to build CX500 engines with all Green shells. You will have more clearance once the engine is run in. Use Graphogen running in compound to match the shell to the crank and it comes out after the first 500 miles oil change. Black shells just need to be run in a bit more.
Bryanj:
Ash, I think you are overstressing mate. Consider the facts
(1) its an old motorcycle no matter how many new bits
(2) You are unlikely to rag the arse off it in any way that comes close to its original owner(s)
(3) Being honest its probably going to be a sunny high day and holiday bike
(4) No matter what you build it with, run it in nicely(but not too carefully) with lots of oil changes and it will outlast either of us!!
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