[Peanut_EOD]

K&N Pod Filter
Clipons
Brake Lines
Brake/Clutch Levers
Brake Rotors
Brake Pads
Sprockets Front and Rear
Slip on Exhaust(minor modification may be required)
Gold Valve Emulators
Springs
Preload Adjusters
Rear Shock

 

[Peanut_EOD]

is there any particular year(s) that these 250 parts fit the 300 or are they all the same?

2008-2012 Ninja 250R

 

[Peanut_EOD]

The passenger foot rests, and the rear brake reservoir and cover are different. Everything else on your list is interchangeable. I have both bikes and have tested swapping most parts on the bike.

 

[Peanut_EOD]

The swing arms are the same, but the 300 has an extra bolt hole in front of the tire. This means that a hugger designed for a 250 could go on a 300, but one for a 300 couldn't go on a 250 unless you added an extra bolt hole. Still not a big deal. Just not plug and play.
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[Peanut_EOD]

Hate to revive an old thread but can anybody confirm if front/back wheel rims from a 250R fit a 300?
I'm trying to go racing but I don't want to use the "good" tires for commuting; so instead I want to use the 250r wheels for that. Any help would be great.

Yes the wheels are completely interchangeable.

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[Peanut_EOD]

Anyone know wether or not the chain and sprockets are interchangable?

Yep they are.