[shawnbo]

Hey guys,

I need some clarification and/or advice.

I have a 2005 CRF450X. Just got a JD kit and installed it. I have a few questions.

I live in Denver CO. I ride at 5000-12000ft - Per the instructions I've put the red needle in, 3rd clip position and I used the #160 main.

I have the following mods:

1. FMF Titanium Powerbomb Exhaust with FMF Megabomb header
2. Full airbox mod, top and side - Twin air filter
3. Backfire screen removed
4. I did the AP mod as well
5. Pink wire isn't done - should I?
6. 45 Main, stock
7. Stock leak

As I was reading the instructions I saw the section that talked about racing mods and to use the #170 main. I'm assuming that is for sea level. So if I'm running a #160 should I run a #165 with all my mods?

Anyone riding at this altitude with similar mods? I didn't find anything in the jetting section.

Thanks for the help.

[450xdirt]

Most of my riding is at 5000-10,000 ft I use the following and it works really well:

165 main
JD needle 4th from top
45 pilot
1 1/2 turn out on the fuel screw.

You don't really need to do the pink wire mod until you put an R cam in or hot cams.

[shawnbo]

What mods do you have?

[450xdirt]

check out my garage...

Open air box
Ti4 pipe
FMF power bomb
Twin air power flow
boysen QS2

[shawnbo]

Got it. Runs perfect.

Year: 2005
Model: CRF450X
Elevation: 5000ft-13000ft
Temperature Range: 20-100 degreees
Smog (AIS): N/A
Airbox Modified Top: YES
Airbox Modified Sides: YES
Backfire Screen: REMOVED
Air Filter: TwinAir
Pilot Jet: 45 Stock
Main Jet: 165
Needle: JD RED
Needle Clip Position: 4th
Fuel Screw Type: Storm
Fuel Screw Setting: 1 1/2 turns
AP Modified: O-Ring
Leak Jet: Stock
AP Cover: Stock
Exhaust Type: FMF PowerBomb TI with FMF Megabomb Header
Exhaust Modified: Full
Pink Wire Modified: NO

[450xdirt]

Awesome! Glad to hear it. Have fun twistn' it

Don't forget to keep an eye on your plug to see exactly how she's running.