Motorcycle sprocket and chain conversion question?

Question

I wanted to know if anyone could tell me more info about what are the effects of changing the rear sprocket from 45 to 43 (-2) and put a 520 chain instead of the 530 stock.

what would it do to the HP, maxspeed, torque, acceleration and MPG?

thanks

Answer 1

I think dardoonk is confused. If you went from a 45 to a 43 tooth, that would gear your bike higher making it more top speed and less acceleration. Think of a mountain bike. When you have it on a bigger sprocket in the back, you go slower. When you change it to the smaller sprockets, you will go faster. As for the chain, i would not go from a 530 to a 520. They are a smaller chain and with the power or the bike, i would want the stronger thicker chain.

Answer 2

The sprocket changes will negligble but change the sprocket out of the transmission, primary drive to the 520 so all 3 components are the same.

Milage is usually measured by the front wheel so the drive ration will not affect it, look at the front wheel, 1 brake line,probably right and 1 speedo cable left.

Answer 3

It will make a pretty big difference.  Your speedometer will be affected by a little bit if the speedometer is signalled electronically off of the transmission (you can get on different sprocket manufacturer sites to see the percentage of change in speedometer readings).  If the speedo is run off of the front wheel (depends on bike), you will not see a change at all.  Look at the front wheel (axle area - between the center hub and the fork leg on the left side, usually).  If you see a sensor there with wires running up the fork leg, you're good to go.  Torque will go up (easier wheelies) along with acceleration, but your top speed will be reduced by a few miles an hour.  Nothing drastic from a two tooth change, just a 3-5 mph top speed decrease.  It's worth it, in my opinion.  The biggest change will be in the weight savings.  A 530 is a pretty hefty chain, and a 520 is a nice light alternative (looks like a bicycle chain when held side by side with a 530).  You should actually get a couple of horsepower out of the swap, believe it or not.  How much the increase is depends on how much power your bike had to start with, but it will be noticable.  MPG will go down, but not enough to upset you.  It's still worth the fun.  One last note - if you have a digital speedometer that runs off of the transmission, you can get a "Speedo Healer".  It basically takes the electronic signal from the sensor and adjusts it to make the display read the correct MPH and miles on the odometer.  They run about $100.00.  Good luck.      

Answer 4

will show more miles, will cut top speed, will increase acceleration, will hurt mpg on hwy might help in city though.

the 520 is thinner and lighter but shorter life and you must change both sprockets with the 520 which is also sold as a kit

Answer 5

From the sprocket change, your acceleration would improve & mpg & top speed go down.  You'll end up running at higher rpm at any given speed compared to where you are now.

HP doesn't change.  It will feel like you have more torque because of the change in gear ratio

The difference in a 520 & 530 chain is in it width.  The first digit (4, 5 or 6) denotes a chain’s pitch – the center-to-center distance between chain pins.  The second and third digits indicate the chain’s width, measured between the inboard surfaces of the inner sideplates.  You'll probably have to change both sprockets if you change the chain

Take a look here for more info:

http://www.ekchain.com/faqs.htm