Originally Posted by BrewsterPunkk07RR
Ok so the 09+ is different. But how come the other 07 I rode felt quicker down low.
There could be 100 different reasons why: gearing, tire wear, wheel bearings, chain and sprocket wear, air filter, PC or not, miles and wear on clutch, wear on engine, how the engine actually differ between wear wise, worn out spark plugs, etc. Sometimes lots of little things add up to make a bigger thing, especially in the chain and sprockets.
I could go on forever but "feel" is such a subjective thing that it's hard to pinpoint exactly what makes two bikes different. And as you can see there are a ton of variables and the bike must be identicle or you'll be chasing your tail especially if say your buddies bike is -1/+2 geared which is very common.
Here's my suggestion: start with the basics. Make sure your bike is in tip top mechanical shape and fully serviced. Plugs, air filter, oil, coolant, chain and sprockets not worn, clean, lubed, correctly adjusted, your clutch is adjusted and working correctly, valves checked if it's the time and your exhaust is mounted and functional with no holes or leaks. Make sure your tires are properly inflated and not worn out, have a shop (or do it yourself) verify your brakes are not dragging and your wheel bearings aren't worn out. If your bike sits outside a lot and has more than 25k on it I'd suggest spending the $100 and getting new wheel bearings installed; while they take a lot to "wear out" and are probably still good for quite a few more miles that's about the point I have started to feel them get a little sloppy and the bike feels so much tighter after.
Then see where you're at. If you still feel like it's not quite right take your bike and your buddies to a dyno run night somewhere and have them dynoed right after each and see how they stack up. They may not be as different as you think.