Yamaha 540 SRV snowmobile motor

I noticed last season a clean area on the case which indicated a case seal leak.
This test proved it.

Sealing the intake ports
(bicycle tire inner tube material)

Sealing the exhaust ports

Motor - compressed air connected to the pulse line

Exhaust side
Notice the air bubbles / clean portion to the bottom left of the picture.
These are soap bubbles caused by a seal leak.

On the intake side a second leak was found - circled in green

The power take off seal looks good - no bubbles.
I'll not bother testing the magneto seal right now - both seals will be replaced anyway.  They'll be tested after replacement.

Air bubbles
click here
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