Join Date: Jun 2015
Location: Queensland, Australia
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I'm still waiting on my GSXS1000 to turn up at the dealers, but I used to own a 2008 GSXR750. I put Motul 5100 oil in it at a service and experienced much the same as what you're talking about. It wouldn't always go into second under hard acceleration, It'd drop out of second and back to neutral just after I'd changed gears.
I changed the oil, no further problems.
A mate had a similar issue with his Kawasaki ZX9R, used a different oil and it went away.
I don't know if the oil had anything to do with it, but the problem conveniently disappeared after changing oil.
2016 Suzuki GSX-S1000 (Metallic Triton Blue)
2007 Triumph Daytona 675 (Sold)
2008 Suzuki GSX-R750 (Gone)
2002 Suzuki GS500 (Sold)