Oil/H20 Pump Binding Issue...

Howdy,

I'm Hail-Mary'n (hope this forum is active) this post to try to get some info before I put the bike back together and/or source new parts. In short, I can barely turn a newly re-assembled H20/Oil pump in my hand via the impeller/drive sprocket. Is this normal?

BACKGROUND to issue:

I pulled my 02'' H20/Oil pump because of the common seal failure.
Banged out the old seal/bearing, per FSM, and replaced the seal(s) and the impeller.
Bearing came out fine. Spins normally. Was re-oiled and re-frozen for install into the housing.

ISSUE DETAILS:
When re-tightening the H20 pump housing after installing the seals, the impeller spins freely.
When re-tightening the OIL pump housing, the impeller begins to bind. *note: oiled oil pump b4 install*
When all covers/bolts are tight to the 7.5ft/lbs, the impeller is barely able to turn.

I've removed the bearing and re-installed it again, thinking I had a poorly seated bearing... but the problem duplicated itself again.

Is this type of binding normal? (I can't think it can be... but, idk)
Any thoughts as to the cause of this?
Any ideas as to how I could solve this problem?




 
Thanks man.

I tinkered with it more and more. Got the identified seizing sorted.

Seemed like it needed a very specific re-setting of the oil pump. Once that was finished up, it ran loosely in the hand.
 
I followed the FSM, and utilized this fella's video: (R1/FZ-01 H20 Pump Rebuild)

The key was to ensure it wasn't binding, and it had to do with the excess of the ft/lbs I'd put into the mounting bolts of the impeller and oil pump housing.

I'm used to working on DRZ/XR/KLR/CB/XS/Chopper type bikes that are generally over-engineered and that don't have tolerances this tight. 1-3ft/lbs makes a difference in even a 20y/o race motor.
 
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