SOHC.co.uk Forums > CB350/400
Smokey rebuilt 350
royhall:
Alright for some then. Have you bought any mass produced soap stone yet that was made by hand in the sellers village, keeps the village alive you know. ;) Wait a minute, is that shaving foam behind your ear. Been there before. Will check the thread. Enjoy.
royhall:
--- Quote from: K2-K6 on March 15, 2018, 08:04:24 PM ---I've read through that thread on net site, and something they are missing which may have a parallel here is those ring markings vertically in the bores.
That says to me that the piston rings are not round when compressed into the bore, else the ring's ends would not protrude further than their outside diameter (and make the marks you can see) that is not right. His question about black ring coating, and should it wear, shows that the rings are not touching the bores where the coating remains. They are, in effect, elliptical in shape. That will not seal the bores either oil going up, or compression going down. It should be getting to something like 175 psi, it's nowhere near.
Leakdown testing is only going to show efficiency in holding compression, it'll not show oil retention ability as that's the opposite direction.
Exhaust valve guide leaking doesn't usually affect combustion chamber as it's introduced after the cylinder. It'll smoke yes, but just from passing oil into a hot exhaust system.
Inlet guides leaking usually show with throttle shut on overrun, inlet vac goes high and pulls in oil, when you get back on the throttle it'll puff out a single-ish cloud of blue smoke.
Looks like the rings aren't working as they should, whether they'll bed in if they're not touching in the first place I doubt it. You'd, in effect, have to wear all of the "touching" parts of the ring down first before that process could even start to take place.
But as the first example of massive ring gap, that's what you'd get by the time you had achieved the above. There's lots of evidence in that thread but it's not being connected.
--- End quote ---
That jumped out at me straight away after taking it apart, but seemed secondary to the head gasket issue. Have got some time today so am going to probe deeper. Just how good are these Cruzinimage piston kits, they look well made but it's concerning me now as the Cruzinimage gasket set was shite. Would like to find a +.25mm OEM piston set and rings for my spare barrel but that does not seem likely. Does anyone make quality piston rings that will fit the Cruzinimage pistons?
Nurse Julie:
Absolutely nothing wrong with Cruzin piston kits Roy. Anyway, no, I haven't bought anything from India, we don't do the 'normal' tourist stuff, more like travellers than tourists really. The locals know we don't fall for their sales pitches, so they don't try anymore ;D
AshimotoK0:
That jumped out at me straight away after taking it apart, but seemed secondary to the head gasket issue. Have got some time today so am going to probe deeper. Just how good are these Cruzinimage piston kits, they look well made but it's concerning me now as the Cruzinimage gasket set was shite. Would like to find a +.25mm OEM piston set and rings for my spare barrel but that does not seem likely. Does anyone make quality piston rings that will fit the Cruzinimage pistons?
[/quote]
Hmm Crap gaskets ! ..crap inlet rubbers ! (I saw your horrid images of them !) ..the jury's out on those rings. "Spoiling the the ship for a ha'peth of tar" springs to mind ;D
royhall:
--- Quote from: AshimotoK0 on March 16, 2018, 10:04:55 AM --- That jumped out at me straight away after taking it apart, but seemed secondary to the head gasket issue. Have got some time today so am going to probe deeper. Just how good are these Cruzinimage piston kits, they look well made but it's concerning me now as the Cruzinimage gasket set was shite. Would like to find a +.25mm OEM piston set and rings for my spare barrel but that does not seem likely. Does anyone make quality piston rings that will fit the Cruzinimage pistons?
--- End quote ---
Hmm Crap gaskets ! ..crap inlet rubbers ! (I saw your horrid images of them !) ..the jury's out on those rings. "Spoiling the the ship for a ha'peth of tar" springs to mind ;D
Your probably right Ash. That's why it's going back together with all genuine gaskets and stem seals etc. Am looking for genuine pistons and rings also. Been bitten enough on this bike with pattern parts. The new front mudguard from Silvers is gently rusting away whilst the genuine re-chromed rear is still perfect.
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