IF you don't want or need the very top speed of your bike and you don't mind sacraficing some top end you can change your countershaft sprocket, the little one up front really cheap, just go down 1 tooth unless you really want to play hard then go down two teeth. Even with one tooth you will have to be very sensative to throtle input or you will clock it, turn it over on its seat before you know it. Be VERY CAREFUL IF YOU DO THIS! shifting into second third and perhaps fourth with a wide open throttle could result in some serious damage when you lose control of the bike...Rememer you only have two little contact patches and all the power is transmitted by the back one! IF you have the big rear fender hanging down you could dremel part of it off, then use a file then some sandpaper to get it very smooth again...if it is like the ones here in the States it is more like a drag chute on a funny car, really cutting the air and causing lots of drag. Shaving your seat or getting a 2" taller wndscreen to keep you in the aerodynamic flow, or airflow is important too. Break it in properly, really, don't cheat, and follow the directions and then switch over to a great synthetic oil. Get some great tires for your road conditions...and practice all of your maneuvers in a parking lot until you can do them with ease.
I've got a few, First get a new exhaust, it won't be that big of an improvement but it will sound awesome. Then go for a new oil, a good synthetic should work, you see you can get higher rpms with less friction.
Like ZX-2R said, the gears are very important, Try getting them to shift RIGHT into you powerband. This way you can keep up the high rpm. I"m guessing you want to go faster right? in that case, go with a smaller reas spocket. you'll get a lil increase in top end, but less acceleration. A new power command won't hurt either.
Nothing is really cheap...just stay tucked in, and change your gearing. If you were building an engine from scratch then ther ewould be some places to do some special chemical applications to the engine, after everything was ballanced,,,going to Titanium valves and softer valve springs, and in reality the cheapest way to increase HP is to just but a better bike. You can spend more on upgrades in the end than you would just buying one larger!
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