520 chain coversion questions
 

I know without a speedohealer since the gearing is changed your speed and mileage will be off so you might be putting more miles on the clock than you are riding. Only bad if you ever intend to sell.

but I'm not sure about the other questions.

Why don't you get the 525 kit? It's much stronger and will last a quite a bit longer (as long as it's installed properly) The improvements from the weight reduction are very subtle, like maybe a tenth or two on lap times. In the streets you'll never notice the difference, till one day....

I didn't know you could go -1 +2 with the 525 chain. I didn't want to have to get a weaker chain, but everything I read said to do it with the 520. Thankss

good choice on the gearing choice. the 520 chain and sprocket IS the way to go. rk is the right chain. the vortex CAT5 are better than they were before but your sprocket choice is up to you. your saving rotational unsprung weight by getting the 520 kit which means more horsepower is hitting the ground, not increasing the amount you have. the speedo healer is a must, it will say your going faster than you really are and will destroy your odometer w/ mileage. w/ the set up you pick your acceleration will be amazing but you will probably lose 10mph off your top end. but getting there will be more fun ;) how many of us ride 6th gear redline all the time anyhow. OO and if your interested,,,,, you'll be able to wheelie like a mo-fo. on top of that your bike will look hot compared to the ugly chain and sprockets OEM. GO w/ the 520. If you were to consider not goin -1/+2 go -1/+1...less dramatic of change but performance enhancing that you will still be able to tell occur. Speedohealer brand not sure of.

OVERALL:
lighter, better acceleration, lower topspeed, better looking

sorry to be long winded lol

Have the Driven kit, put on in march '09...12000 mi later the rear sprocket teeth have shard finned. Going stealth supersprox right now. They offer lifetime guarantee on their rear sprocket if you buy the kit.

Thanks so much RMH3. That was very helpful. I think I will go with the Supersprox. The lifetime guarantee is awesome.

I would try to test drive a buddys bike with the -1 +2 sprockets if possible.
Try before you buy, if you can. Its not a stunt setup but it's a dramatic setup for a daily rider.

If you do any highway cruising you'll might to reconsider the gearing. Good for track/weekend ride. Not so good for a daily rider.

The high rpms on the highway forced me to switch back to stock gearing after 2 weeks. 520 conversion with stock gearing is my next purchase.

Yes, you'll wheelie like a mofo but you can also wheelie the f4i all day with stock gears and some expierence

Just trying to show you all angles, not to talk you out of it.

Sorry if this has been answered already; I don't feel like reading through everyone's posts.

I currently have -1/+2 on mine (that's how I bought it). It'll accelerate quick, but still not as quick as a 1k. They just have too much torque to keep up with once you get moving. However, it's easy to wheelie, for sure. I've wheelied several times without even trying. Your odometer, speedometer, and trip odometer will read approximately 20% high (actual: 100 miles, recorded: 120 miles). I've had my bike up to 142 mph and it maybe had one or two more mph left.

I personally don't think making the switch is worth it (and I've actually ordered a stock gearing set). Engine is running at about 8,000 rpm at freeway speeds, which kinda gets irritating. Gas mileage is also decreased, and riding around at low speeds requires very sensitive throttle input for a smooth ride. If you're not stunting and you're not drag racing, I'd say save your money.