i have a full FMF exauhst and K&N airfilter... I wanna take off the lid of the airbox, my friend said that if i do that i will have to jet it properly, but my other friend said that you dont have to rejst it...wat is the answer? If i take off the airbox lid do i have to get it jetted?? help please

and do you think it will really make any kind of difference

 

It will make a difference and you will have to jet it...There will be too much air coming into the carbs for the fuel to mix with.There wont be enough fuel to mix with the air.Unless you have a jetting size that will already work for it.

 

Take the lid off and see how it runs. If it runs better with the choke on then you know it's lean.

 

First, with the warrior's retarded airbox setup you can't take the lid off without modifying the airbox or lid because it holds the filter in position. Either you can cut a big hole in the lid so that the lid still holds the filter in, or you can do what most people do and get a pro-flow adapter which allows the use of a clamp on filter. I recommend the clamp on because the stock filter setup can allow dirt to get past the foam seal at the end of the filter. Either way you decide, you will have to rejet, but it will make enough of a difference to be worth it. You should rejet for the colder weather anyways.

 

thanks...i looked at it the other day and realized that the airbox is all messed up and isnt that easy

 

Ok so i have an 87 Warrior with a white bros e series slip on and want to add a new air intake. It still has the factory setup andi know has sucked sand in over the years. So Which intake worksbest on the warrior and which jet size should i put in????? Please help! It will be trail ridden in southern arizona with trips to dumont and glamis every now and then.

 

Definitely get a clamp on kit from Pro Design or Noss Machine. The choice between the UNI filter and K&N is up to you. Personally I prefer k&n because with an outerwears prefilter they can be water and mud-proof, and are quick and easy to clean. It seems like the market has been moving towards foam filters lately, supposedly they filter better, and they're a little cheaper, but i really hate cleaning them, it's just a big sticky messy pain in the ****. Either one will be better than your stock setup.

 

ok so pro desgin looks good, but what about the jet size. Accroding to white brothers the e series doesnt require jetting. but with an intake kit it would do how do i know what jet size to go with and how to adjust the carb correctly. Should i buy the clymer manual and stop asking these type of questions?

 

Jetting isn't a science, it's trial and error. Go to a dealer or powersports shop and get a few different jets, i would try 147.5 and 150. Also back the fuel screw out 2 and a half turns from fully in, and maybe lower the clip on the needle a notch.

check this out, jetting tutorial for warrior carb

You'll have to sign up (free) but there's a wealth of information on that site that every warrior/raptor 350 owner should check out. After you sign up, start out at the 2nd post of that thread, the one by YamahaQuad350. That should get you going in the right direction, but if you have any troubles, post them up here, or on the other site, and somebody should be able to help you out.

 

and if you want a service manual, i uploaded a PDF file of the same service manual yamaha dealers have. You can download it here. If you have dialup internet it may take you an hour or more to download it, but I think it would be worth it to save the $25 a clymer manual costs. I just print out the pages I need when I use the manual, instead of running back and forth between the garage and computer.

If you don't already have it, you will also have to install Adobe Acrobat Reader on your computer, also a free download.