moddin my brand new wr450r '04 in oz
Posted November 28, 2004 - 12:18 AM
i have been reading for a while about all the mods and stuff to get the wr really moving, but i'm a bit confused???
to start, the australian version of the wr450 only has a tiny baffle in the exhaust with pop rivets holding it in. i have chiseled them off and removed a very small baffle from the end. most of the pics on the web seem to leave a much bigger hole after removing the baffle then mine???
next, my wr came with a racing sheet and a throttle stop screw also, but the initial screw was reducing the throttle to 50% i quickly changed the screw over to the one supplied which has given me more power, but i don't think it's a yz spec screw. do i need to go and buy one of these?
i also got a front counter spocket in the kit which has one less tooth on it, should i be installing this for performance gains.
i would imagine the grey wire makes a difference to my model also?
do i need to cut holes in my airbox because of the position of my battery?
sorry guys. i love my wr and need your help in making it even better!!!!
Posted November 28, 2004 - 12:20 AM
in the kit was also some extra jets for the carby, can i install these or should i get a jetting kit?
Posted November 28, 2004 - 01:19 AM
For better air flow you have to fabricate a cradle for the battery to sit in the top of the airbox.
The throttle stop in the race kit is all you need and use the largest(178?) main jet in the kit when you change or modify the std muffler, best muffler is the yz pipe.
Pull it apart and repack it well and the spread of power will be much smoother with a good hit in the mid-range to top-end and it's not noisy.
Best gearing I've found is 14/51 for all round use some go lower 14/52 but it's personal I suppose?
I wouldn't worry about the YZ cam if you jet it right and get the muffler sorted it should rip!
Posted November 28, 2004 - 01:33 AM
just a couple of things. why don't you worry about the grey wire in aussie models? no difference?
why is the yz pipe better than aftermarkets? should i get yamaha to fit the jets when it goes in for valve clearances?
found anything on the web about fabricating a cradle for the battery to sit in (ie. diagrams?)
Posted November 28, 2004 - 02:37 AM
You can cut the arse out of the stock muffler and weld in a larger outlet. A friend of mine did that and his sounds better than stock, but quieter than YZ.
Posted November 28, 2004 - 03:54 AM
i might just look at a zorst, jetting, adjusting airbox and sproket
Posted November 28, 2004 - 05:26 PM
Airbox - Just cut out the two oval templates on the right hand side of the airbox
Grey wire - Not much difference
Jetting - Get the adjustable fuel screw to tweak the air / fuel mix for the conditions. Avail on this website. I also installed the JD jet kit. Also good.
The bike comes with a 15T sproket. I swapped to the 14T to gear the bike down and make 2nd more useable on the hills.
The throttle stop that comes taped to the paperwork is the same as the YZ stoppper.
Just ride the bike for a bit to get a baseline and if you like it dont worry too much about the mods.
Hope this helps
Posted November 29, 2004 - 02:47 PM
Here's some good links:
Also have a read of this article:
Also the manual is also a good bedtime read. Reading is the key
Posted November 29, 2004 - 07:32 PM
im worried if i move it, it'll never be right again and i'll screw it hehe
Posted November 29, 2004 - 09:12 PM
Posted November 30, 2004 - 01:27 AM
Posted November 30, 2004 - 02:20 AM
If your bike stumbles off idle when the throttle is cracked-especially after you've been coasting off throttle-the fuel mixture screw setting is too rich. Turn the fuel mixture screw in. If the setting is too lean, the bike will hesitate, go "waaah" and have an airy feeling right off throttle. A bike that pops also hints at a lean pilot circuit. If your four-stroke pops at the crack of the throttle, suspect the fuel mixture adjustment but also check for an exhaust leak at the head pipe or slip fit.
This was taken from the article I posted earlier. I find that if the bike is bogs a bit I will lean the air / fuel mixture by screwing it in 1 / 4 turn. Sometimes at the start of the day I will jump on the bike and fiddle with it a bit until it runs great.
Posted November 30, 2004 - 04:54 AM
Posted November 30, 2004 - 04:57 AM