I have thought about this issue before and do wonder if the front cylinder bearing lube "pool" being slightly past vertical renders it basically useless.
I was tempted to fill it in with DevCon and re-drill the 2 holes as there is no point having a pool that has gravity working against it I guess.
I don't have the bike in a 70 degree wheel stand all that much.
There is a 3 part photo here which shows what we are talking about (sort of).
The rear cylinder transfer port areas lube the centre and left hand main bearings. The front cylinder right hand transfer port area lubes the RH main bearing.
Of course, you have to agree with the reasonably obvious points made by Chester, but Fontyyy does make a good follow up argument, thats for sure.
I do not have any engine cases that are apart at the moment, so can't really have a look to see if it might be possible to machine an oil lube pool/path that would work better with gravity for the front RH cylinder.
It is an interesting point, but a new bearing probably lasts a pretty long time anyway?
The cost/effort of re-machining the cases, and/or adding a extra line from the oil pump, probably outweighs the cost/effort of replacing a main bearing every 20,000 km/miles??
Why did Honda bother to create a lube pool at all for the front cylinder, if it doesn't work?
Maybe there is more to this than just gravity? Or maybe it was just done for symmetry?
Most of the time when running, it will be so turbulent that the "pools" probably make little difference.
Keep thinking Fontyyy.
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[color=#808080][size=9]Yes,.. I too know how to waste Time and Money,...