SOHC.co.uk Forums > CB350/400
Smokey rebuilt 350
AshimotoK0:
I am wondering with Cruzin rings that they buy from different sources at different times .. some good .. some not so good so a bit of a lottery... Only a theory. I bought four sets of Genuine CB125 single pistons & rings for my 500K0 .. almost identical parts (apart from valve cutaways, which I modded) but a fraction of the price NOS of 500 ones due to demand for latter. I twigged because someone listed CB125 piston and CB500K0/K1 was in the compatabily list. (and of course I checked with Bryan on here :) ) Three piece oil rings too.
Nurse Julie:
Should the clearance on Cruzin pistons / rings not be 1 thou Roy?. I know the genuine Honda pistons can go down to 0.0008 thou but I thought a tad more clearance was needed on the Cruzin kits. I can't ask Trig, I am not allowed to mention, Honda, bike, work or Forum whilst on our travels ::) ::)
royhall:
--- Quote from: Nurse Julie on March 16, 2018, 02:19:44 PM ---Should the clearance on Cruzin pistons / rings not be 1 thou Roy?. I know the genuine Honda pistons can go down to 0.0008 thou but I thought a tad more clearance was needed on the Cruzin kits. I can't ask Trig, I am not allowed to mention, Honda, bike, work or Forum whilst on our travels ::) ::)
--- End quote ---
Leave it until you get back Julie. Am going to PM Trig about a rebore anyway so will go through the possibilities then. Enjoy your holiday.
royhall:
Been back in the garage today to look at the pistons and barrels closely.
The vertical scores on the bores are no more than marks, cant feel them with a scriber or a finger nail. I have checked all the top rings in the bores and all gaps are 7 to 8 thou. The rings appear to have run-in evenly all the way around and do not have any damage or scoring, nor could I find any protruding ring ends. Don't know if it's worth checking the second and scraper rings as I don't want to risk damaging them getting them off the pistons, but I will check that they are all fitted the correct way up.
From what I see, I would say the barrels are good for re-assembly. Before then I am going to "engineers blue" the barrel top to head mating surface to check how they go together. Have already checked both are flat.
The problem I think, from the evidence left behind, was the Cruzinimage gasket set being rubbish, allowing oil to escape around the control jets then under the head gasket, there is quite a bit of oil pressure at that point. I don't think the two forward drains have caused any issues as there is no pressure there.
On next assembly only genuine Honda parts will be used, plus Trig has a trick with extra o-rings that hopefully he will chip in about on his return from India.
MrDavo:
We should hire an Indian to follow Trigger everywhere on a Honda so obviously sick that eventually he has to take a look to see what's wrong with it... 8)
Didn't we have an issue with this company's rubber camchain tensioner wheels in the past?
The words don't, touch and bargepole spring to mind.
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