Carb Holder - Rubber - WR450F - 2007-2011 - YZ450F - 2006-2009

Jetting can seem like alchemy or outright magic if you don't have an idea of what you're doing and a solid handle on all the variables.

Cracked and leaking boots don't necessarily have to LOOK cracked and leaking to allow enough air in to give you fits when dialing in your carb. A fresh boot can help your bike run better / be more efficient / make more power / and keep your lunch money out of the swear jar.