Just upgraded from 03 to 07 WR450

I just picked up an 07 WR450 for $3900 :worthy: It's totally stock and like new. I've been reading and searching the archives. TT rocks :thumbsup:

Anyway, here are my notes so far. Any comments or advice is appreciated.

1. Air filter cage hole - The hole is "fixed" but I'd rather have the new cage

Part # 5TJ-14458-00 Service bulletin # M07-001.

2. Free Mods - grey wire, snorkel, throttle stop, AIS, removal, pea shooter

- Which AIS? DIY, GYTR, TT

- GYTR AIS # -> GYT-5TJ93-69-01

- Maybe an aftermarket pipe. FMF Q4?

3. Carb - jet it for 8500 ft - creeping & WOT - Rocky Mtns yeah!

- jetting YZ needle or GYTR mystery needle or JD kit?

- Which YZ needles are people using? 2006 Standard Needle for 07?

- What's a NCVQ needle? What's an EMR needle?

- Which fuel screw. Old WR has Zip Ty but may not be best option.

- accelerator pump (AP) o-ring or wire tie mod

- AP screw 1/2 turn mod?

- what's ACV?

stock jetting is prob pretty good for 8500 ft:

mj 162

pj 45

leak 60

start 65

paj 70

maj

needle nfnt

future jetting tbd:

4. Skid plate - flatlands, scorpion, TT (Utah Sport), etc

- leaning towards flatlands

http://flatlandracing.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=FR&Product_Code=24-40

- TT pic

http://utahsportcycle.com/store/wr450fpic.htm

5. Unabiker Rad Guards FTW!

6. New tires

- front D756

- rear D756 or Maxxis IT?

7. New black wheels

- front rim is bent a tiny bit - straighten? doubtful.

- have silver rims annodized black or buy new? which rims? hubs?

8. TBD

- Hand guards

- TrailTech from 03 WR or new?

- +2 sprocket on rear?

- graphics

- maybe new gel seat or ?

- mount Scott's stab from 03 WR --> SUB mount? bar risers?

- AVS controls? or local guy's replicas? RMCP

- new tool kit - wrap style?

That's quite a list. It's a good thing you only paid $3900, because you can easily spend another $3900 in the after-market world...

Yeah. No kidding!

thats ll well n good, but how does the bike compare to your old one, give us a write up when you`ve been out on it eh?

I did almost the same change as you (from '04 to '07) can you tell me wich is the fuel consumpion of your bike also compared to old one?

I noticed on mine a very big consumpion increase.

Just finished my 2nd ride on my "new to me" 2007 wr450. I like it so far but I miss a few things about my 2003. Both bikes are uncorked and jetted. The 03 has an FMF Q-pipe and my 07 has a stock pipe.

1st off the stock 07 pipe sucks! On my 1st ride the low-end was horrible and the bike wouldn't rev high enough at WOT to even hit the rev limiter. I gutted both baffles and yanked the pea-shooter...wow what a difference but OMG it's loud! Sound tested at 106 dB @ 4500 rpms. Unacceptable :banana: I'm picking up a like new Leo Vince X3 in 1 hour for $125 :excuseme: It has 94db, 98dB, & 102 dB inserts

Power delivery is smoother on the 07 but the low end doesn't hit as hard as my 03. I wonder if the Leo Vince X3 will fix that :lol: My 03 is a wheelie machine and I miss that. I wonder if the lower CG of the 07 is holding the front down or if it's a low end power issue. Any thoughts?

Suspension... Both bikes are set-up stock. I def need to tune the suspension on the 07. It's harsh compared to my 03 and I just don't have the confidence in the whoops etc.... and that 07 seat just works my arse.

Handling... The 07 feels ~25 lbs lighter, waaay skinnier, and much more nimble. :excuseme: The front-end feels much "looser" and squirly than my 03 though. The arm-pump kills me. I have a Scott's stab on the bench that should fix that. I never really needed it on the 03. BTW, this comparison is based on the 03 WITHOUT the damper. The 07 will def be easier to ride once I dial in the susp and get my stab mounted.

Fuel consumption... TBD

9/26/08 Progress Update

1. Air filter cage hole

Part # 5TJ-14458-00 Service bulletin # M07-001.

New cage installed

2. Free Mods & exhaust - grey wire, snorkel, throttle stop, AIS, removal, pea shooter

- GYTR AIS kit installed part # -> GYT-5TJ93-69-01

- Leo VInce X3 s/o installed

3. Carb - jet it for 8500 ft

- GYTR mystery needle installed

- System-tek brass tipped fuel screw

- accelerator pump (AP) o-ring mod complete

stock jetting was ok for 8500 ft:

mj 162

pj 45

leak 60

start 65

paj 70

maj

needle nfnt

8/21 jetting:

changed leak and needle

mj 162

pj 45

leak 40

start 65

paj 70

maj

GYTR Mystery needle position #3

o-ring mod

9/25 jetting:

Prior jetting too rich. Changed main and clip position based on PMs w/

Mtn-Track, this post and extrapolating RAD from well liked sea level jetting tables

mj 152

pj 45

leak 40

start 65

paj 70

maj

GYTR Mystery needle position #2

4. Flatlands skid plate installed

5. Unabiker Rad Guards installed - new style guards are amazing!

6. New tires installed

- front D756

- rear Maxxis IT

7. New black wheels - tbd

- front rim is bent a tiny bit - straighten? doubtful.

- have silver rims annodized black or buy new? which rims? hubs?

8. Trailtech Endurance installed

9. 54 sprocket installed on rear -> 54/13

- stock 120 link chain wouldn't fit

- bought +4 link chain and cut it back 2 links

10. Scott's stab + submount installed

11. TBD

- Hand guards - Cycra?

- graphics

- maybe new gel seat or ?

- AVS controls? or local guy's replicas? RMCP

- new tool kit - gytr wrap style?

Were you able to stuff that 54 rear sprocket in there with the stock chain? I know I can fit a 52 on mine but I don't think a 54 will make it with the stock chain and guide....

Were you able to stuff that 54 rear sprocket in there with the stock chain? I know I can fit a 52 on mine but I don't think a 54 will make it with the stock chain and guide....

No. I should of mentioned that... :lame: I had to replace the chain. I bought +4 links from stock (120 vs 124 links?) and then cut it back 2 links.

Got it! I still have too much life in my chain to swap it out just yet, so I'll go with a 52 rear for now. Thank's!

Were you able to stuff that 54 rear sprocket in there with the stock chain? I know I can fit a 52 on mine but I don't think a 54 will make it with the stock chain and guide....

Why wouldn't you just run 12/50 :lame:

Same final gear ratio as 13/54 :bonk:

I ran that for a season on my 07 but now run 13/52

Why wouldn't you just run 12/50 :lame:

Same final gear ratio as 13/54 :bonk:

I ran that for a season on my 07 but now run 13/52

Good point. I already had the 54 tooth and then installed it. I found out the chain wouldn't fit and bought a new chain in hast because I wanted to ride that day. In hindsight 50/12 would have been the way to go.

Why wouldn't you just run 12/50 :lame:

Same final gear ratio as 13/54 :bonk:

I ran that for a season on my 07 but now run 13/52

A 12 on the front is a pretty tight chain wrap, so I stayed with the 13. I also wanted to move the rear wheel as far forward as I could to help out in tight/quick turns.

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