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CB400Four cylinder bore clearance NOS pistons 51,75

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eem46:
Dear All,

Just got my Honda CB400F cylinder back from wetblasting, gonna mount NOS pistons with a third oversize, so 51,75mm.

Ofcourse the machine guy will measure each piston and match that size  to the sleeve/bore.

Which clearance must he take? As tight as possible? 0,04mm or 0,05mm or 0,06mm (sorry no inches)

Please advise, thank you.

Kind regards,

Emiel

Nurse Julie:
Using OEM Honda pistons, Trig works to a clearance of 0.0203mm which is equivalent to .8 of a thou in inches. The clearences you are mentioning are WAY to high, even for pattern pistons.

eem46:
Hi Julie, good that I ask than :-)

I will sent the information to my machine shop.

Thanks for the quick reply.

Kind regards,

Emiel

Nurse Julie:

--- Quote from: eem46 on February 04, 2020, 02:32:55 PM ---Hi Julie, good that I ask than :-)

I will sent the information to my machine shop.

Thanks for the quick reply.

Kind regards,

Emiel

--- End quote ---
You are welcome Emiel. It sounds like you are making good progress.

eem46:
I am working on two bikes at the same time, not very efficiënt, one complete stock, with many NOS parts (including exhaust header) CMSNL loves me,  and one fast version (big bore, alu rims, bored carbs by Rick Denoon, Kevin TTR parts, stage two welded web cam, stainless Motogpwerks exhaust, alu Koni's, skimmed drilled disc, Hyperpro front springs, Pro bolt titanium bolts, K&N filters, BT45's)
So yeh enough to do! :-)

@Julie : PS: tolerance piston for aftermarket big bore kit? 0.03mm?

Kind regards,

Emiel

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