Bigger Sprockets for better acceleration?

[joshscustoms]

Bigger Sprockets for better acceleration? Has anyone done this?  How many teeth should it have?  is there a  way to figure out what the rpm it will be at highway speed?

[Re-run]

OK I have to assume you are talking about upping the rear sprocket. Depending on bike, choices might be limited. Another option is to drop the teeth on the front, however you have much less range there. A general rule of thumb is that a 1 tooth change on the front is equivalent to a 3 tooth change on the back.
For example, my 78 750 uses a 15T/41T. If I drop the front to 14t it would be like raising the back to 44T. works both ways.

One thing is that you do not want to go down to far on the front as it is a smaller sprocket and can cause accelerated chain wear in some cases.

using my ratio 15/41 I have a 2.733 ratio. If I drop that 1 tooth on the front 2.93 Quite a change.
More accel but less top end and it will be "buzzier" on the hiway.  Now if you change just the rear- lets say a 42T rear, it is a 2.8  a 43 is 2.86 and a 44 is 2.93.

[Four 2 4]

I agree with everything re-run said, and have changed both on several different bikes.  It's a faster swap to do the back, just not as much stuff to remove.  I have found that on these 70's-80's 750's (I have had  Kawasaki's and Hondas)  there is enough power in the motor, that the bottleneck in performance was top speed.  I have gone down at least one tooth size(rear sprocket) on all of the bikes I've had.  If you want the pull off the line, just feather the clutch a little, and keep the rpm's high.  Usually just keep the same front gear...one tooth down on back = about +5-8 mph (stock size front gear)

The newer sprockets add a nice clean look, and sometimes have "weight savers" punched through them...every little bit helps with these old tanks.  I have also found it's a good idea to change both front and rear gears and chain all at the same time.  This way you get consistent wear on all three.  If money is an issue, look at JC Whitney....I am not a huge fan of them, as some of thier stuff is garbage, but I have one of thier gears on my Honda now for about 3 years, and it's still in great shape.  

I never skimp on the chain.....that's just something you don't want issues with!  Keep it clean, and lubed up...DID or Regina chain are my fav's.  

MJ

[Re-run]

In addition, careful with the sprockets. Do not use plastic, just not strong enough for these heavy things. Aluminum is ok but will wear out sooner and probably take your chain with it. JT or Sunstar are probably the best unless you can find the honda sprockets.