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Discussion Starter · #1 ·
After pressing in new main bearings, I can’t get cranshaft into crankcase (bearing too tight). Has anyone experienced such problem?

Bike model: XRV750 RD07 (year 1994).
Frame code: RD07-2102723
Engine code: RD04E-2402625

Crankcase code: B
Crankshaft main journal code: 2
Measured crankshaft main journal O.D.: 49.99mm

Bearing color chosen: blue
Bearing code: 13325-ME9-305

Did I choose the rigt bearing code?
 

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Discussion Starter · #3 ·
Crankcase was heated during bearing shell press-in procedure. No extra heating was done afterwards.

Still I am seeking information to find out what is bearing selection process in practice.
 

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Discussion Starter · #4 ·
Left (generator) side bearing shell is more tight, compared to the right side bearing.
Inner diameter of left crank case (without bearing) is 53.98mm. So on border with next, thinner bearing shells (black or brown color code).

I am puzzled - Honda ought to be top producer of precise and repeatable sized parts down to hundredths of milimiter. I do not have reasonable explanation. Bearing shells should be identical (at least part codes were), bearing pressing is done by proffessional, both crank case and cranshaft ought to be original - no overhaul done on this engine before (assumption).

I could star purchasing next bearing shell sizes hoping those would be thinner. But apart from that being expensive experiment (plus official Honda dealer does not provide those shell sizes any more), this seems completely un-logical taking into account that Honda XRV service manual does NOT mention any extra steps or size variations within shell replacement procedure.

Anyway, I am lucky to have motorcycle restauration workshop near my location. RaMoto have been accustomed doing specialty tasks on any (including historical) engine:


They scraped off few hundredths of a milimiter from shell inner surface and rehoned it until reaching standard cranshaft-to-bearing oil film thickness (approx 0.03mm). They were only ones that agreed to take time and risk with such operation.

There seems to be left reasonable bearing material thickness, so I hope there is still sufficient resource left in this part. But I really would appreciate any information on this topic, as clearly bearing shell honing should not be part of standard approach... or is it?
 
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