Quick Sprocket Question
My goal is faster accel without hurting top speed and mpg. What could I expect from a stock front and +2 rear sprocket with a 520 chain? What could I expect to gain from this? Also would this be the right set up for my goals? How about just +1 in rear and stock front? Is this a mod worth doing or should I just keep stock size? I was thinking Vortex sprockets with DID chain, is this a good choice in brands? Any advice would be very much appreciated! Thanks
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Any faster acceleration achieved through adjusting your final drive ratio will theoretically always hurt your top speed. The typical quick accel kits are -1 +2. Using a lighter 520 chain and lighter sprockets, see: aluminum, will reduce the unsprung weight and the rotational mass and will help increase acceleration marginally but will not affect top speed so thats one way to go. But as soon as you start changing your final drive ratio you have to sacrifice in one area to gain in another. The -1 +2 kits just find a good compromise that increase acceleration without drastically hurting your top speed so just going +2 in the rear will help your acceleration a little and hurt your top end a little less than a -1 +2. Gas mileage usually increases 1-2 mpg too as well from what ive heard.
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Yeah, definately agree with the post above. Anything you do to acheive gains in performance, something with will be sacrificed. If you don't mind the decreased life of a 520 chain and an aluminum rear sprocket, I would go this route to get what you want to achieve through weight reduction. If you don't like that idea, I would leave everything the way it is and save the money. Good luck.
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I also personally agree with the posts above. I personally would choose the faster acceleration over top speed, since it will feel a lot faster and you will use it more. Ask yourself how often do you ever go close to the top speed of the bike?
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Take into consideration you're rpms will be higher while crusing on the highway. So you're not only losing top speed as well as losing mpg and the ability to cruise at a lower rpm.
Gas mileage only seems to increase because your odometer will off and will be reading a higher miles per tank than your actually getting. To each their own, but i'd only lower my sprocket ratio if i had a track bike or stunt bike. |
Originally Posted by Sick97SS
(Post 983659)
Take into consideration you're rpms will be higher while crusing on the highway. So you're not only losing top speed as well as losing mpg and the ability to cruise at a lower rpm.
Gas mileage only seems to increase because your odometer will off and will be reading a higher miles per tank than your actually getting. |
Originally Posted by Sick97SS
(Post 983659)
Take into consideration you're rpms will be higher while crusing on the highway. So you're not only losing top speed as well as losing mpg and the ability to cruise at a lower rpm.
Gas mileage only seems to increase because your odometer will off and will be reading a higher miles per tank than your actually getting. To each their own, but i'd only lower my sprocket ratio if i had a track bike or stunt bike. |
A +1 in the rear probably would probably have little effect. I believe the stock fdr for the f4i is 2.88 (16/46 stock sprockets) so going +1 in the rear would make it 2.94 which would help your acceleration a little and probably only hurt your top end by a couple mph but no I dont think its worth it. +2 would raise your fdr to 3.00 and youd probably see top speed decrease of 5-7mph. Youd probably be the happiest with that and a 520 chain and aluminum sprocket if you dont mind the shorter longevity of them compared to the 525 and steel sprocket.
As for the 600rr's all I know is they have 3 less teeth (16/43) but they could have a different transmission with shorter gearing. So maybe that with a lighter drive system and lighter curb weight and probably a couple extra hp would explain why their faster. Dont forget rr stands for race replica so theres a little more that goes into those bikes than our f4i's |
Originally Posted by nickp123
(Post 983692)
A +1 in the rear probably would probably have little effect. I believe the stock fdr for the f4i is 2.88 (16/46 stock sprockets) so going +1 in the rear would make it 2.94 which would help your acceleration a little and probably only hurt your top end by a couple mph but no I dont think its worth it. +2 would raise your fdr to 3.00 and youd probably see top speed decrease of 5-7mph. Youd probably be the happiest with that and a 520 chain and aluminum sprocket if you dont mind the shorter longevity of them compared to the 525 and steel sprocket.
As for the 600rr's all I know is they have 3 less teeth (16/43) but they could have a different transmission with shorter gearing. So maybe that with a lighter drive system and lighter curb weight and probably a couple extra hp would explain why their faster. Dont forget rr stands for race replica so theres a little more that goes into those bikes than our f4i's |
yeah exactly just think of it like a rearend in a car. Stock speedo is off like 5-10% i think but i couldnt say how much this would effect it. You can buy a speedohealer to fix it but theyre like $100, thatd be your best bet if you didnt mind the price. Im still using the stock gearing but I think the aluminum sprockets do need to be changed every season or every other season depending on use and abuse. Yeah it should make wheeliers easier since it will give you a little more "torque" in a way. Obviously the engine wont be making more but you get what im saying. Thats why you see stunt bikes with huge 50-60 something tooth sprockets that are the size of the wheel.
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