Allowing the oil to spill out of the void between the 2 tubes is preferred by some because it allows a direct comparision between the after service condition and the pre-service condition. If you want to tune the oil level and don't know the previous by the book measurement (using the GMP/WP/KTM way) you measure it upon disassembly and adjust accordingly when refilling by setting the new oil height after activating the tubes. The difference is about 30mm as I recall(don't quote me on that).
For a check do the GMP method, assemble, pump the tubes, diassemble and again measure the oil level. Instead of 150 it will be in the 120's. KTM issued a service bulletin on this a few years ago.
Did that make sense?
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2018 Sherco 300SEF - Similar heritage to the original GG brand
2017 KTM 300XC- dipped in $ by previous owner
2012 KTM 350XCF-tagged and dual sported
2009 KTM 250XC - street legal CO trails connector
2015- Giant Trance carbon advanced-pedal power
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