what brand jets?

[yoshimurakfx400]

what jets to buy for my 03 kfx, i already know what size i need but i dont know what brand carb i have so i can buy the jets

It depends. Dyyno jet sizes are different than the mikuni. Let say the mikuni 150 is what you need thats a 160 dyno jet. The sizes vary as you go through different mains. I acually have a mini jet kit for sale the includes an aftermarket needle,25 pilot, 160 mikuni,160 dynojet,165 dyno jet, 157.5 mikuni, and the shim for the needle. Similar to the alba kit but the alba has 1 main and cost 20 dollars. I'll sell all this for 20 shipped. Oh yea i prefer mikuni and 150 mikuni main woul dbe perfect for you.

Mikuni / Dynojet Size Comparison Chart

Mikuni--Dynojet
140-----149.3
150
142.5---152.0
145-----154.7
155
147.5---157.3
150-----160
152.5---162.7
165
155-----165.3
157.5---168.0
170
160-----170.7
162.5---173.3
175
165-----176.0
167.5---178.7
180
170-----181.3
172.5---184.0
185
175-----186.7
177.5---189.3
190
180-----192.0
182.5---194.7
195
185-----197.3
187.5---200
190-----202.7

A 140 Dynojet is going to leaner than your stock mikuni jet. I would go to the dealer and get a 147.5 or 150 Mikuni main.