to put one on do you have to break the chain?how much top speed will i loose? thanks an advance!

 

Well, I assume you are talking about the 300EX. No, you do NOT have to break the chain. All I did with mine was loosen the chain and it gave me enough slack. You have to toss the case saver or modify it to accompany the larger sprocket. You will GAIN top speed with a 14T, since stock is 13. You will notice the bike not wheen out so fast. Good investment and cheap.

NT

 

sorry about that the question is for a 400ex.thanks

 

No need to take any links from the chain. You will loose a few mph on the top end.

If you really want to benefit from this change, open the airbox up and rejet with a Dynojet/K&N kit.

 

all u have to do on the 400ex is loosen the chain all the way and take the old one off and slip the new one in my guess in top speed would be 1-3 mph cuz with mine 14/39 on my speedo i still get 63 and your not going up in the back so your top end loss will be minimal ok

 

At 8000 RPM, you will lose 4.4 mph.

With a 15 tooth your speed would be 66.5 in 5th gear at 8000 RPM
with a 14 tooth your speed would be 62.1 in 5th gear at 8000 RPM

 

Are you sure you want to do this mod? I had a 14 on for a while and it was great fun, but the front end was NEVER ON THE GROUND. I couldn't accelerate out of a turn, because I had no steering control!

 

Dude it's a $14 mod who cares try it and see if you like it. If not your out $14 no big deal just buy one.

 

How do you figure you'll LOOSE top speed with a larger front sprocket?
You will gain top speed by using a larger front sprocket unless your engine does not have the power to rev out as much as it did with the 13 tooth.
ERIC