SOHC.co.uk Forums > CB350/400
CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE
hairygit:
Oddly enough, when I bought my only brand new Honda, a CB125T2 back in 1981, the fitter said to me, always let it idle or as close as you can until the rocker cover is too hot to keep your hand on, then ride it, and that way it should last for ages. I've always done that with all the other Hondas I've ever owned, and never had a piston or rings give out on one. So worth bearing in mind once it's back together!
Nurse Julie:
Thanks for your input chaps, I really do appreciate it very much. I will add here that Trigger is saying exactly the same things and I believe him 100% but it's just nice to hear the same things from other such knowledgeable people who have had hands on practical experience of these things.
Seabeowner:
Amazing amount of damage for an engine that still ran reasonably well and the top end looked so clean. Presumably its had a few oil changes in the 500 miles and something would have shown. Are you sure the rattling noise was not detonation? Sure sign if opened throttle up from fairly low revs under heavy acceleration.
I'd put those pistons up somewhere as trophies.
Nurse Julie:
Oil changed every 1000 miles and she was performing fantastically. Are you calling 'detonation' noise what I call 'pinking' if so, definitely none of that.
hairygit:
It could be that the previous owner had run it weak (pod filters and or non standard pipe?) Probably couldn't get it to run right and went back to stock, but the damage was already done. The carbon on the pistons and head hid the damage initially until you got the barrels off and started cleaning bits up. That's why I cringe when people on here ask about pod filters on cafe racers, I always advise against it, and kinda look forward to the inevitable posting of pictures like yours, while thinking to myself "told you so" Obviously once damage of that nature has occurred, even running properly it will only get worse, as you have sadly found. I worked on many two strokes with pods over the years, usually with a hole the size of a 10p piece dead centre of the pistons, they are totally bad news.
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