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CB466f
Erwin83:
Well, that escalated quickly:
Apart from finding 2 broken piston rings, sticking oil-scrape rings, 2 hardly torqued down head nuts (the ones in the sparkplug hole), no mayor problems found (yet).
Now, I'll be on the look-out for a company who can bore the cylinders to 54,5+ mm (anyone know the piston clearance and ring gap specs on these?), and in the meantime, I will focus on refurbishing the head.
K2-K6:
Have the piston manufacturer no data for the clearance etc?
Differences in material can mean very significant changes to the spec compared to original metallurgy in these engines so you really need specific information to get them correct.
The ring gap is most probably going to be factory tolerances unless specifically detailed as the materials don't change much. But the piston itself can have quite fundamental impact on bore sizing.
Erwin83:
There is no specific installation manual provided for this. I just emailed the people in Australia to find out if they specify anything other than standard.
Standard assembly clearance (as I understand from the service manual: 0,01-0,04 mm piston-cylinder clearance.
Ring gaps 0,1-0,3 mm.
Nurse Julie:
Definitely get the data from the manufacturer, as if you are reboring to take oversize pistons, the liners will be a lot thinner and the heat displacement totally different than standard liners / pistons. Also, are you sure it says 0.01-0.04 mm, that only equates to .3 of a thou. OEM Honda pistons need .8 of a thou and Cruzinimage pistons 1.0 thou clearance🤔🤔🤔🤔 And 0.04mm is approx 1.5 thou and the engine could smoke like a chimney.
Erwin83:
Found the info for the 400:
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