Topic: Best place for crank main bearings?

[slyguy]

Here in the USA or must we look overseas for the old bikes? My case is are AAAAA & crank are AABBA which should be all yellows, correct?

[HondaMan]

I get them at South Sound Honda online.
Which engine is this?
I'd strongly suggest getting some Plastigage at your local auto parts store (the 0.001"-0.003" size) and use it to measure all the bearings first, for best results.
Chances are, you'll find you need the next smaller size than the case numbers indicate, at the least. This will also raise the oil pressure in the engine, not at all a bad thing. You actually can't get them too tight: even if you bought all BLACK shells there will be adequate clearance as the crank journals have all worn down some. Even if the crank and rods were all brand new, using BLACK shells would not be so tight the engine wouldn't run, but it would take a longer time to break in before you could go for the redline.

[MRieck]

Here in the USA or must we look overseas for the old bikes? My case is are AAAAA & crank are AABBA which should be all yellows, correct?

I have a lot of Yellow main bearings for sale if you need them.

[Oddjob]

Unless it’s a 400 yellow is normally the smallest size, Blacks are normally the biggest. I would imagine you’re trying to say go up a size Mark, going down a size would increase the oil gap.

[bryanj]

Biggest in this context means thickest lining so Black is the "biggest" and the extra micron or two will reduce the running clearance.
I have buit 500 engines with all black shells fitted and after carefull running in and oil changes they are fine

[slyguy]

It’s a 750. I was just using their case & crank lettering & the manual. I don’t have the journals specs or any bearings for plastigauge either. The case halves are empty (painted)

[Don R]

 A longtime SOHC Honda tech told me he uses green on everything.

[Don R]

 Yes, AA and AB are both yellow, as Mark said there if it's a high mile motor and there has been wear the next tighter size is available. Either will work and likely be fine. Some of the drag racers always went with yellow, they abused the engines as much as anyone but they always kept fresh oil in them.
 It looks like south sound Honda, Mike has yellows, and I've gotten them quickly from Yamiya in Japan.
  Just so we're on the same page,
  Black makes the tightest clearances
  Brown is next looser
  Green is next looser
  Yellow is the loosest

[MRieck]

A longtime SOHC Honda tech told me he uses green on everything.

He's not wrong.