SOHC.co.uk Forums > CB750

bore to piston clearance k2 advise please

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roverboy:
hi im new sohc and would like avice on bore to piston clearance

McCabe-Thiele (Ted):
Might be worth a PM to Trigger or his other half  Nurse Julie as Trigger is/ was the to go to professional rebore man.
On 500s it is now Bryanj.

Trigger did my 400, Bryan my 500 both did excellent work.

Nurse Julie:
Welcome to the forum. Do you mean piston to bore wear limits or clearance for a re bore?

K2-K6:
Honda manual for 750 notes :- 0.01~0.04 mm as minimum clearance.

That's at the skirt and 90 degree to gudgeon pin location for piston diameter.

This is with Honda pistons, obviously, and of that material type. If you used piston with a different material spec, then their manufacturer would advise you of clearance for that material.

Car engineering shops often look at these figures for old Honda with disbelief and usually make statement of "it'll seize" at that gap  :)

You'll need to insist on your spec if they are not well versed in these engine and materials along with their tight tolerance.

roverboy:
hi thanks to all your replies the reason i,m asking is that i had a rebore and the piston to bore clearance is set to 0,0004 1th and i am worried it will be to tight as the book says 0,0004 to 0.00016 would like your comments please

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