SOHC.co.uk Forums > CB350/400
CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE
Craig CB400:
--- Quote from: Nurse Julie on October 10, 2017, 08:47:46 PM ---That's really interesting Craig, also good to see another wrecked engine ;D Can you remember if #4 piston was ok or was it one of the others?
--- End quote ---
It was an end one on mine too, also had the same damage to the rings and sides of the pistons. My research on the cause was not definitive but best guess was the carbs running very lean and judging by the state of them when I checked them it may be right
Nurse Julie:
--- Quote from: matthewmosse on October 10, 2017, 09:05:26 PM ---Craig, you are right, these bikes are far better off being used, my cb500 got to 250,000 miles and the engines in better shape, just needs new rings and one selector fork plus gear it runs in.
Julie, you need to see the contents of my shed - plenty of wrecked engines in there, thanks to my buying at the very bottom of the market.
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I would love to look in your shed Matt ;D. I think the consensus from the experts on here is that this damage had occurred prior to me owning the bike and yes, it was definitely off the road for 9 years before I got her. So this brings up another learning point which is that if a bike has been sitting for however long not being ridden, it may be years (nearly 4 in my case) and miles (almost 5000 in my case) before a pre existing problem worsens and presents itself. I am now beginning to understand why with every bike that Trigger buys, (and i mean every bike !!!) regardless of condition or if the PO says it has had an engine rebuild or the bike has undergone restoration, he strips that bike right down to the frame, including the engine because he wants to check every part for himself, just to make sure it's ok.
Nurse Julie:
--- Quote from: Craig CB400 on October 10, 2017, 09:15:29 PM ---
--- Quote from: Nurse Julie on October 10, 2017, 08:47:46 PM ---That's really interesting Craig, also good to see another wrecked engine ;D Can you remember if #4 piston was ok or was it one of the others?
--- End quote ---
It was an end one on mine too, also had the same damage to the rings and sides of the pistons. My research on the cause was not definitive but best guess was the carbs running very lean and judging by the state of them when I checked them it may be right
--- End quote ---
A matching set Craig !!!
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And the back side
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Trigger:
Did you mention chains Oddjob ;D I empty this bloody box every six months, get through a few ;)
Bryanj:
That grey sludge in the bottom was probably not grinding type paste but well chewed up bits of alloy from anywhere, those chains and gears mush alloy up really well, ask Trigger about the 175 and 250 centrifugal oil filters! On looking the shells I would use again as long as you know which rod/hole they came from, same with horseshoe, looks in really good knick---just make sure it pivots extremely freely and locktite the two special retaining bolts in---I have seen those come loose. New tensioner springs would be nice but I don't think they exist any more, sure a similar size but maybe a bit stronger can be found
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