hi yall im new to this so bare with me.... i have a 2002 yamaha warrior 350 with the following mods...
1. full yoshi exhaust from end to end
2. k&n filter (with open box)
3. fmf jet kit stage 2
4. new gears (dropped a tooth in the front)

do yall think i can keep up with a 400ex?

 

i have a raptor 350 and i can keep upand alot of the time leave them behind. mine is jeted and has a pipe on it with stock gearing. now those z400 are another storie they musthave abeter power band or something..

 

you should be able to, top end the 400ex will take you, but a stock 400ex should have a tiny bit more low end torque but yours should have better mid range pulling power, in a short drag you should most likely win if not be a tie, ive rode along with a few near stock 400exs and i didnt have trouble beating them on mine, but when there 426s like the 2 ive ran with thats a different story lol.

 

I had a bone stock 02 Warrior and was riding with a group of young guys on modded 400EX's on a hare scramble trail and literally drove up the a$$ of them. I mashed the tailpipe on his muffler. lol The question is loaded. It depends on the rider. If you are a good rider and they are average then you will win. I think too many people expect modifications to compensate for a lack of talent. A great rider can make an average quad or bike awesome.