Thank you for the advice. I’m on Long Island so id say 0-500 feet elevation is what it should be jetted to. Riding in 50-85 degree temps.Hello,
You absolutely need to rejet. Even with the stock exhaust they are in dire need of jetting to run as it should.
That said - to help you with the jetting we will need your elevation and even region will help.
Here is a basic guide to be used as a reference for the pilot jet. I went one up on the pilot jet also but do not have my records to give you that size right now. Maybe someone will chime in and have that number for you.
You should remove the seat & lift the tank. The carb boots loosened will allow you to rotate the carb CW position to get to the underside and remove the float bowl. Pretty straight forward but make sure you check the throttle & hot start cables are free to rotate and good after repositioning the carb. You might want to do the want is called the tie wrap mod also. That is basically hard wiring the accelerator cam to the index lever. Just gets rid of the gap/ slop in quick hard snaps of the throttle. If jetted spot on there will be zero bog on hitting the throttle.
You are going to love that bike once you get it jetted right. They are like a different bike!
One other nice item to add is an aftermarket adjustable air / fuel screw. Slight adjustments with temp. altitude and air density keep that bad boy running perfect. Get a brass one not aluminum.
Jetting Guide for Main Jet:(pilot 45) CRF450R/X
Sea level....165
2000 ft.......162
4000 ft.......160
6000 ft.......158
8000 ft.......155
Temperature/Elevation:
One main jet size (up/down) for every 2,000 feet or 25 degrees in temp.
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