I have a 700 raptor and i want to increase my top end speed. My take of speed is excellant. Do yall think it will help if i drop my front sprocket to 13 and leave my rear sprocket the same. Right now my front is 14 and the rear is 38. Does anyone know the formula? Thanks

 

I have a 13 on the front, it is more for take off, thats about all i know. Sorry

 

Your take off speed (acceleration) is excellent. But you want more top end speed, which means you want to go faster, right? So instead of doing the claimed 78 mph stock, you want to do more like 80 mph or faster? Then the last thing you want to do is drop a tooth in the front. This will only decrease your top end speed by increasing your acceleration.

So here's what you do:
Add a tooth to your front sprocket. If stock your countershaft sprocket has 14 teeth, go up to fifteen. I ran a fifteen in the dunes on my 660 and had no problems pulling it, so I would assume the 700R would have no problems with a 15 tooth. The Bombardier DS650 has a 16-tooth front sprocket.

Or, if you don't want to change your front sprocket, here's how you adjust the rear sprocket: Drop two teeth, see how that feels. If it isn't enough, drop one or two more.

By increasing the teeth on your front sprocket and decreasing the teeth on your rear sprocket, you will increase your top end. But you can only go so far either way, before you return to the same ratio. So here's what I would try first: Add a tooth to your front sprocket. It's the easiest change to do first because all you have to do is remove the master link in the chain and remove the front sprocket. But remember to loosen the countershaft sprocket nut before breaking the chain. Then all you have to do is put the larger sprocket on and put in a new master link. If this isn't enough of a top end increase, you may then want to try the other options.

Another easy way to increase top end speed is to increase your rear tire size. Larger tires equals a faster top end speed.

 

149 beat me to the answer. Add a tooth to the front will not only increase the top speed but also prolong chain life.

 

thank yall for your help! [img]i/expressions/face-icon-small-happy.gif[/img]

 

There comes a point of diminishing returns, gear too high and you'll have terrible accelleration while gaining 1-2mph up top. You can easily over gear and end up not being able to pull the gearing at top end. The 700 isnt a high revver out of the box (and until a cam comes out it wont be) so be careful you dont go beyond what the bike can handle.

What exactly are you doing that you need to exceed 75-80 mph? Unless you're riding it down the road as legal transportation I really cant think of why you'd need to.