Hi all,

I've got my barrels off and thought I should do a leak test to be sure that when I put it back together the crankseal integrity is good so I don't have to pull it down again immediately after.

Question is, how far do I fill the top cylinder with petrol/oil mix? I've been told that if you fill it completely or too much, then yes, it will leak regardless, giving a false positive (it's leaking when it really isn't).
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MC21 Honda NSR250. TYGA 300 conversion.