Jump to content
Sign in to follow this  

Pilot Jet Too Rich?

Recommended Posts

2003 CA XR400R, Snorkle removed, UNI filter, FMF Q2 w/ stock header, 160/60 jets (stock needle, 3rd position). Running at sea level.

Symptoms: Won't start or run at all with choke on full. Starts ok with no choke.

It idles but dies immediatly if I twist quickly on the throttle. I only get an increase in idle when I turn the fuel mixture screw in to completely seated. After about a 1/2 turn out, the idle starts dropping (which is what makes me think the pilot jet is too rich). Thinking about a 55 pilot.

Any thoughts?

Thanks!

Share this post


Link to post
Share on other sites

If the motor doesn't die with fuel screw in completely the pilot jet is too rich. Go down one size at a time.

Share this post


Link to post
Share on other sites
I only get an increase in idle when I turn the fuel mixture screw in to completely seated. After about a 1/2 turn out, the idle starts dropping (which is what makes me think the pilot jet is too rich). Thinking about a 55 pilot.

Sounds reasonable to me. I'm running 58/158 in my '98 and it is perfect - explosive throttle response right off idle. I have the snorkel pulled and run a stock filter, but have 2/3 of the backfire screen removed - I cut the front screen out and removed the fluffy steel wool that is between the two layers of screen-door screen. Now, there remains only one layer of screen-door type screen (run a bead of JB weld around the outside of the screen to seal in the cut edges of the front screen if you do this. It eliminates the chance of a stray piece of missed screen wire getting pulled into the motor). I think cutting out the backfire screen does as much as pulling the snorkel.

JayC

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×
×
  • Create New...