Posted May 01, 2009 - 10:37 AM
The ACV, well, if you want, do it, I did it to mine but then I reverted back to operational. It really only makes adjusting the fuel screw easier on some bikes.
Neither one truly affects jetting or performance, only convenience
Posted May 01, 2009 - 10:47 AM
I recommend doing the mods for the above reasons.
Posted May 01, 2009 - 12:00 PM
Posted May 01, 2009 - 12:57 PM
While you have the carb off the bike, check the AP squirt timing. Now is the time.
Posted May 01, 2009 - 02:37 PM
AIS=Air Injection system
Before you pull the muffler and get all loud, get a James Dean jet kit, remove the snorkle, do the throttle stop, grey wire (if it exists) first, then decide, "is the bike too slow for you?"
+1. but would also add the adjustable fuel screw, which doesn't come with the JD kit.
Posted May 01, 2009 - 06:37 PM
I am from canada and got a 08 wr450 whats is the grey wire do thats so important that every one cuts? ive read all about it on here but what does it control? and does the canadian 08 model have it?
Your Canadian bike will need the grey wire cut.
Posted May 02, 2009 - 11:01 AM
awesome thanks to every one for their replys. im just getting used to htis web site so thanks again to every one. one more quick Q...what does AIS stand for? air intake system?
Air Induction System
Remove it, but don't throw it away. Keep the components together in a box.
You may have to install it back.
Posted May 05, 2009 - 09:34 PM
thank you for every ones help and input.
Posted May 30, 2009 - 08:44 AM
You don't need to rejet for the throttle stop mod. It's the same on the 450F as the 250F. If you don't want to cut the throttle stop yourself, your dealer may have a YZ throttle stop you can buy, the GYTR AIS removal kit comes with one, and I'll bet your dealer (or neighbor) could cut it for you if it came down to that.
i just got a 2003 wr450f and want to do the throttle stop mod.will i have to change jetting or anything?also im looking at the 250 throttle mod but like the other guy said do i cut off the same amount?would a yamaha dealer do it?that may be easier