I have had some problems with clutch slippage when using synthetics. As in, the bike would lurch forward with the clutch lever pulled in and switching into first gear.
The clutch system is lubricated by the same oil the engine uses and seems to not care for the synthetics. I would recommend sticking with standard 4 stroke oil.
I have heard from tons of other people who have had no problem using synthetics, but from my experience, its a bad idea.
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