I have a 2005 YFZ with a K&N filter, that pro-flow deal, and yoshimira tri oval exhaust and I have been having problems trying to jet it. Does anyone have close to the same stuff and is the carb jetted right? What jets are you using? Thanks.

 

I run a 175 main and a 45 pilot. But that's gonna be way different for you though I'm sure. I live in oregon, so the air density is probably way different. Go to your yamaha dealer and ask them for the proper jet set up for where you ride. They should know.

 

Thats pretty close to what I would have suggested.
45-48 pilot
stock needle on 6th clip, or YZ needle on 4th clip
172-178 main

I think that'd get you pretty close, but you will need to fine tune it.

 

dude, im running close to the same thing 2.5 turns open on the fuel screw 170 main, 45 pilot, dirtbike needle on clip 3 and remove the airlid cover!

thats it.......

J

my page and profile has the info as well

 

YOUR BEST BET WOULD BE TO CALL YOSHIMURA AND ASK THEM..THEY SHOULD BE WILLING TO HELP U