Free Mods WRF 450 07 ???????????

17 replies to this topic
  • rickbury1985

Posted November 30, 2009 - 08:37 AM


Hello and hope somebody can help, I am new to this site and fairly new to riding and im interested in the free mods that can be done to my bike, Although there are alot of threads about the removal of the AIS there isnt much which says what the part to plug the gap is called and where it can be found, ive had a look in the Parts Store under the search name of AIS Removal but no cap ends are availiable, Also does it make much of a differance to the way my bike will run, im reading mixed reports and dont want to risk doing it if im gonna end up causing myself lots of trouble, Lastly ive spoken to somebody that has told me that when the mods have been done then the carb will not need re-jetting as they are apparently fitted with fiffferant jets when they are shipped to england.

Many thanks:

inexperianced modder!

  • panaman

Posted November 30, 2009 - 09:08 AM


here is the part number for the GYTR AIS removal kit

  • rickbury1985

Posted November 30, 2009 - 09:37 AM


Many thanks, I carnt seen to find it in the parts store under any name, is it discontinued that you are aware of? thanks

  • panaman

Posted November 30, 2009 - 01:11 PM


i ordered mine from

  • l_campionero

Posted November 30, 2009 - 01:14 PM


It's a genuine Yamaha kit, available from any Yamaha dealer.

  • JDLowrance

Posted December 01, 2009 - 07:33 AM


Any Yamaha dealer in the US.

  • l_campionero

Posted December 01, 2009 - 03:06 PM


If your dealer will order it by part number, chances are it will arrive. The dealer I used to work for was not a generator or kart dealer, but we could order the parts if we had the part number, and we would always get them in the regular parts delivery.

  • BajaFool

Posted December 01, 2009 - 03:17 PM


The GYT-R AIS Removal kit from Yamaha contains carb jets and a needle that are too rich, a YZ throttle stop which you can buy separately, several rubber cap plugs to block off fittings from which you remove hoses and an aluminum diamond shaped blank off plate.

Do this instead:
Using the jetting specs for a USA 2004 WR450F, replace all the jets and
the needle that are different between your European 2007 bike and the
2004 USA bike.

Go to an auto parts store and buy the vacuum line cap plugs required.

Buy a small piece of aluminum sheet metal the same thickness as the diamond
shaped piece of metal that you will unbolt from your engine and make a
blank off plate. Use the diamond shaped piece from the AIS as the

Go to the Yamaha Europe website, click on "motorcycles", click on
"owners' manuals", follow the instructions to open the 2007 WR450F
manual and go to page 4-22 in the English language portion for a picture
of the Air Induction System. While you are on the Yamaha website, you
can look at the carb specs for the 2004 Yamaha also. Here they are:
MJ 165 160
PJ 45 48
PAJ 70 80
PS 1-3/4 1-1/2 (FUEL/AIR SCREW)
Acc.P 60 50

I am not sure if you have the YZ throttle stop and the Gray wire issue with your bike. If, when you fully open your throttle, the slide is only lifted 1/2 way, you should replace the stock throttle stop with the shorter YZ stop or cut your existing stop to the dimensions of the YZ stop (see stickies on this website). Disconnect your grey wire also. These two things go hand in hand.

The consensus is that the AIS, whether installed or removed, does not affect performance. What it does do however, is make an annoying popping sound on deceleration. This mimics a too lean condition and makes it hard to determine if your bike is running too lean or is just reacting to the AIS still installed on the bike. It also eliminates some weight.

Don't forget that the free mods include opening up the air box and removing the innermost tube from the silencer, in addition to the throttle stop, gray wire and AIS mods.

You will like the new jetting. I have used it for my 2006 and 2008 WR's. Great gas mileage, 30-40 MPG from sea level to 5,000+ft.

  • Lennie

Posted December 02, 2009 - 02:37 AM


A JD jet kit in a UK WR works very well and is well worth the money. You dont need a different throttle stop on a uk bike either, it is already the same as a YZ.

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  • RSAthump

Posted December 02, 2009 - 05:25 AM


By the GYTR kit from Yamaha, it works, I did it here in South Africa, our bikes should be the same

  • rickbury1985

Posted December 02, 2009 - 08:28 AM


Many thanks to all of your imput with helping me out, much appreciated

  • GuyGraham

Posted December 03, 2009 - 04:51 AM


A JD jet kit in a UK WR works very well and is well worth the money. You dont need a different throttle stop on a uk bike either, it is already the same as a YZ.

I think you'll find you are mistaken on this point
WR's have a long throttle stop screw which restricts the throttle opening as they come form the dealer

  • thumperjp

Posted December 03, 2009 - 05:49 AM


Get this AIS removal kit and insert .

And unplug gray wire of CDI Box inside left side number plate.

And change exhaust as you like.

  • Lennie

Posted December 04, 2009 - 12:31 AM


I think you'll find you are mistaken on this point
WR's have a long throttle stop screw which restricts the throttle opening as they come form the dealer

Neither of mine have.

  • GuyGraham

Posted December 07, 2009 - 04:41 AM


Your dealer must have changed them for a YZF one then, as part of the PDI

I can assure that they do come with a long screw which restricts the throttle opening

  • wr450fLee

Posted December 07, 2009 - 09:05 AM


What length should it be if its the yzf screw?

  • GuyGraham

Posted December 07, 2009 - 12:54 PM


23.5mm overall length or 18.5mm from the underside of the head to the end

this explains it better linky

  • wr450fLee

Posted December 08, 2009 - 09:13 AM


Thanks for your help guy.


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