Hi guys,
Just a quick post for those that might be looking to get some rear spools (bobbins) for their ride. I purchased a set for both bikes but found that they didn't fit, turned out the bolts were M10 1.5 pitch and the Ninja 650 & 300 require M10 1.25 pitch. So if you buy a set online or even over the counter make sure you specify the correct thread pitch.