V-twin riders how much do acceleration do you gain by changing sprocket?

Question

One of the most cost effective performance modifications you can do on a inline 4 cylinder sportbike is to drop a tooth on the front sprocket on the 600cc bikes maybe even add some on the back. After that add a PC and exhaust (full exhaust is better by alot).

What are the better performance modifications that get the best bag for buck on a v-twin? Does it work the same for v-twin cruiser and v-twin sportbikes or is there a differance between v-twin bike manufacturers?

Answer 1

The problem with gearing changes on a v twin(any bike really) is that a gain on one end will be a loss on the other.V twins benefit more by making them breathe better with cam and head work followed by fine tuning the fuel delivery .Done right you can actually achieve better than a 100% cylinder fill rate.I'm a big fan of big bore motors because of the torque they make.I ride an Electraglide that will pull the front end off the ground if you want it too.It shocks people when they see how quick it is for a cruiser.It's nothing like a sportbike but not bad for a tractor lol.

Answer 2

Dropping a tooth on the front sprocket will help with acceleration on any bike.  However a slow turning v-twin cruiser is less sensitive to gearing than a higher reving v-twin.

Yes there are huge differences between manufacturers.  There is no way you can draw comparisons between a 45 degree HD and a 70 degree, or 90 degree, sport bike engine (that is the interior angle between the cylinders).

Your question leaves me wondering what purpose, or how you are planning to use this info.  Most v-twins, sport and cruisers, have prepackaged performance up grade kits available that eliminate the need for the rider to learn all the difference between brands.

But one rule will always apply, more fuel and more air will result in more power and greater acceleration.  Its just how you get there.