SOHC.co.uk Forums > CB500/550
gap
murdock:
So I guess it will be like that, the 0.0254 millimetres is 0.25 millimetres, a quarter of a millimetre, 0.0010 inches.
murdock:
I'm sorry, between the language and the units of measurement this is a mess, would it be 0.58 millimeters? a little more than half a millimeter
fogrider:
The Honda chart shows a piston to bore difference of .oo1", which is .ooo5" per side. (half a thou). That's hell of a tight fit ,but that's what the chart says and I believe people have had that done.
How they don't seize up when the piston heats up I don't know .
Careful running in required !
K2-K6:
--- Quote from: fogrider on May 26, 2021, 05:55:25 PM ---The Honda chart shows a piston to bore difference of .oo1", which is .ooo5" per side. (half a thou). That's hell of a tight fit ,but that's what the chart says and I believe people have had that done.
How they don't seize up when the piston heats up I don't know .
Careful running in required !
--- End quote ---
It's correct, and core to Honda design right from early years. Raised silicone aluminium alloy that gives very low heat expansion rate and matches that of the bores.
We had a good illustrative thread on the subject for a forum member's RS 250 single that the engineer shop insisted boring at larger clearance, producing consistent failure and worthwhile searching for.
Nurse Julie:
--- Quote from: fogrider on May 26, 2021, 05:55:25 PM ---The Honda chart shows a piston to bore difference of .oo1", which is .ooo5" per side. (half a thou). That's hell of a tight fit ,but that's what the chart says and I believe people have had that done.
How they don't seize up when the piston heats up I don't know .
Careful running in required !
--- End quote ---
1 thou clearance on these Hondas using Cruzinimage pistons is perfectly safe and plenty of clearance given OEM Honda pistons the clearance is . 8 thou inch, or even less.
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