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Cb400 Countershaft

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4wDaz:
Hi all, I’m just about to strip the countershaft on a cb400 and noticed that both ends of the shaft have a blanking plug fitted but one appears to have a hole drilled in it, is this hole supposed to be in ? Thanks

McCabe-Thiele (Ted):
When you say the countershaft is that the rear most one on which the small front chain drive wheel sits?

Mine are  capped  at each end - no hole - no idea if it matters ?

4wDaz:
Yes, it is Ted, sometimes referred to as an output shaft. I wonder if it was a modification to get oil into the shaft ? It’s done it no harm as the shaft and gears have no wear on them at all. I’m tempted just to leave it, what do you think ?   

McCabe-Thiele (Ted):

--- Quote from: 4wDaz on August 08, 2021, 07:15:03 PM ---Yes, it is Ted, sometimes referred to as an output shaft. I wonder if it was a modification to get oil into the shaft ? It’s done it no harm as the shaft and gears have no wear on them at all. I’m tempted just to leave it, what do you think ?

--- End quote ---

I'm minded to agree with you but I'm not a mechanical engineer - presumably Honda did it for a reason probably to keep oil on the needle roller ends. I do not know if there are any oil feed holes on the shafts themselves I can't remember when I stripped my shaft.

4wDaz:
Thanks Ted, I agree Honda blanked it for a reason, I don’t know the consequences of just leaving it, the blanking plugs won’t be available now but I could machine something up as a press fit to go in or maybe just use some sort of sealant instead if its not under too much pressure,  I think I’ll call round a few bike shops and see if any mechanics can advise me

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