2005–2006 Suzuki RM250 Transmission Bearing Orientation Question (Factory Manual Appears to Contradict Itself)

aaron987
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Location
Port Rowan, ON, CA

 

I’m rebuilding the bottom end of a 2005 RM250 and have run into something that’s confusing me.

The Suzuki factory service manual (Transmission & Crankshaft section, pages 10-12 and 10-13) states:

  • Bearings #1, #2, #5, #6, #7, #10, #11 → Stamped face OUTSIDE
  • Bearings #3, #4, #8, #9 → Stamped face INSIDE

However, the photos in the manual appear to show bearings #2 and #6 with the open ball side facing out, which seems to contradict the written instructions.

To make matters more confusing, the original bearings I removed had the stamped side on the shielded side, but I no longer trust their orientation because I discovered the engine had previously been rebuilt incorrectly. The previous owner:

  • Installed the power valve incorrectly.
  • Continued running the engine with a broken clutch basket spline.
  • Damaged the cylinder head from detonation.

So I can’t assume the bearing orientation was correct.

My questions:

  1. Is the factory manual text correct, and the photos just misleading?
  2. Which way should bearings #2 and #6 actually be installed?
  3. If anyone has an untouched OEM engine or clear photos of an original case, I’d really appreciate seeing them.

I’d rather verify this before pressing bearings in or out again.

Thanks!

 

Aaron

 

|
7/23/2026 7:13pm

#2 and #6 bearings have grooves on one side

image 3471image 3468.png?VersionId=WqYaw1M92flYXjUOhhLOeQm8RFG

The grooves are there for the bearing retainers...

image 3470.png?VersionId=YinkTx9YjCt0YXHZb7J K8nJf48

image 3469

They are both deep groove bearings, if they didn't have the grooves orientation would be irrelevant.

The shield on #2 should face the clutch, if the shield is on the groove side, remove the shield and reinstall it on the non groove side of the bearing. Oil from the gearbox side needs to enter the bearing for lubrication.

1
aaron987
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Location
Port Rowan, ON, CA
7/24/2026 7:34am

ok I think we’re talking about different bearings I know which ones have groves for the retainer clips I’m talking about the 2 in the centre of the case 

Are these installed correctly ?

 

aaron987
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10
Joined
7/23/2026
Location
Port Rowan, ON, CA
7/24/2026 7:36am
aaron987
Posts
10
Joined
7/23/2026
Location
Port Rowan, ON, CA
7/24/2026 7:43am

The Shop

aaron987
Posts
10
Joined
7/23/2026
Location
Port Rowan, ON, CA
7/24/2026 7:44am
IMG 1370 1
Other case half 
aaron987
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10
Joined
7/23/2026
Location
Port Rowan, ON, CA
7/24/2026 7:46am
IMG 1371 2.png?VersionId=OhPwETe0wuC
Centre bearing which way does the shield face 
7/24/2026 6:41pm

The center bearing's shield (#2 RED) should be on the clutch side...

image 3472

Both bearings (#2 Red and #3 Blue) can be run with or without a shield, but if you run them with a shield, the shields should be on the clutch side.

The bearings are lubricated from the gearbox side, they should have no shields on the gearbox side...

image 3467
1
aaron987
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Joined
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Location
Port Rowan, ON, CA
7/25/2026 12:36pm

Thank you so much 

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