The common, simple test is to remove both barrels and fill the top cylinder crankcase with fuel:oil mix. If it starts to run out of the bottom then the seal's not doing it's job!

You really want to leave it over night to see the results. If you can see transfer of fluid within a couple of hours then you have problems!

It's not as comprehensive or accurate as a leak test, but it can be done without any special tools.
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Andy.
NSR-WORLD.COM

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