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CB750 bearing shells

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AshimotoK0:

--- Quote from: AshimotoK0 on August 07, 2014, 10:36:52 AM ---We do have air gauges here somewhere but I am going to use  Plastigage anyway.  A micrometer will show up any major defects though.
Cheers Ash

--- End quote ---

UK Pete:
I have been lucky so far , and have nut had to change any crank bearings, they have a good oil pressure and filtering system and so do not really wear if the oil is changed reguar the crank floats on a film of oil, no metal to metal
Pete

steff750:

--- Quote ---I know that you can grind a glodwing crank and use some car shells but can't remember which
--- End quote ---
;) yes bryan mini shells will fit ,one of my friends rebuilt his Goldwing with them in the seventies ,and the guy who supplied the shells, gave us all the mains and big end sizes straight of the top of his head, 8)

AshimotoK0:
Back in 2010 there was an Australian guy DEFINITELY selling CB750 sohc 0.25mm undersize shells, also for the CBX. I know because I emailed him at the timequestioning if the crank would take a regrind because of the depth of the hardening. Luckily the same  cranks were fitted from sandcast to F2, only the auto was different,  so plenty of good used original ones still to be had, particularly from the States if you can bear the delivery costs. Mine was definitely toast but the top end was absolutely  fine, so I reckon the PO replaced the top end but left the bottom end. Needless to say replaced all of the bottom end components.
I agree with Pete, if oil is changed regularly then the crank holds up very well. My 400/4 has done 25k but the crank and cam bearings / shells  were in almost perfect condition when I stripped it, so I left well alone. I got NOS barrels cheap in the '80's so fitted those too.

Cheers ... Ash

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