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'How To' Yamaha oil pump testing

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SUPERTUNE:
Here's some info on Yamaha pump testing using a cover to mount pump, some accessories with a cordless drill to see if your rebuilt or pump is working correctly.

Here is a '84 RZ350 pump off Brian Baldwins 350.



Video link:

https://photos.imageevent.com/supertune/rd400enginebuildpics/20191015_113338.mp4


SUPERTUNE:
Guillermo's pump setup.






Video's of Guillermo's RD400 setting up the final throttle cables with the TM34's

https://imageevent.com/supertune/guillermosrd400videos?

p=1&n=1&m=-1&c=3&l=0&w=4&s=0&z=3

https://imageevent.com/supertune/guillermosrd400videos?p=0&n=1&m=-1&c=3&l=0&w=4&s=0&z=3


Always look for this thrust shim that goes on the end of the worm gear! Guillermo's was missing!


SUPERTUNE:
Scott's '76 RD400 pump.



Scott's pump was messed with before I got it in for a rebuild and his worm shim washer was missing...nope found it!!  :eek: it was on the pump post for shiming!   :bang:



Testing video:

https://photos.imageevent.com/supertune/rd400enginebuildpics/20191021_184534.mp4

quocle603:
THANK YOU CHUCK!

NYSingh:
Awesome! Checked and my pump definitely didn't have that washer. Now to try and find a replacement  :umm:

Is the pump effectively non-functional without that washer on the worm gear?

Stupid question - when you're testing the pump, is your drill set to forward or reverse? (from your photos the drill looks to be set in the forward (clockwise) position, but want to confirm)

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