HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
BCBrouwer

XR650R lean on bottom, P.J P#'s?

10 posts in this topic

Hey there, My XR650R runs as strong as ever, but I did a few changes this past winter. I opened up the side airbox cover. I also have a uni filter/W/no backfire screen, All uncorking upgrades with the honda racing baffle too. Im running 68s pilot, screw 3.25 turns out, b3 needle, 3rd notch (runs better than 4th notch), and 182mj. 0-1000" elevation. Just a bit lean on the bottom, hanging idle, popping on decel (more than before I made more air available) Long story yes, but you guys may have other suggestions before replacing the pilot (prob not though) Anyone have the part number for a 70s pilot jet? I know 3.25 is too much on the screw, and it wants more. 70s would work better yes? Thanks a bunch for any honest input.

Share this post


Link to post
Share on other sites

http://www.xr650r.us/jetting/

182 MJ is large - what does your plug look like?

Conventional wisdom says: If you see an improvement with the air screw more than 3 turns out you need a smaller pilot jet - try a 65

A little popping is normal

Hanging idle - possible air leak - check carburetor clamps for fit & tightness

Share this post


Link to post
Share on other sites

What's the temperature in Nova Scotia now? Probably pretty cold yes?

Share this post


Link to post
Share on other sites

Yeah 182 is only slightly high for him or most of Canada in all but the middle of summer. I'd try the 70s. Sorry, that's not what you wanted to hear. I'm going to try 180 main, 70s pilot on my bike for Ontario. It doesn't have the side panel cut but it does have a Jardine full exhaust , unifilter, and uncorked of course. Your bike with stock header and hrc tip (i'm assuming that's what you have) would probably do well with 180/70s also. You can find the 70s part number by doing a search on this forum.

Share this post


Link to post
Share on other sites
http://www.xr650r.us/jetting/

Conventional wisdom says: If you see an improvement with the air screw more than 3 turns out you need a smaller pilot jet - try a 65

A little popping is normal

Hanging idle - possible air leak - check carburetor clamps for fit & tightness

Sorry, but the pilot screw quote is all wrong. The pilot screw is a fuel screw not a air screw. A fuel screw and air screw are tuned exactly opposite. Two stroke carbs have air screws & 4 stroke carbs have fuel screws.

If someone is more than two turns out on a fuel screw to get the bike to run and idle properly, the pilot jet is too small. Therefore, you would need to go to a bigger pilot jet.

Besides that, I do agree that an air leak at the carb isolator boot can also cause a hanging idle similar to lean jetting.

Share this post


Link to post
Share on other sites

Well there you go, I'm mixing apples and oranges. I ride the CR250R more lately and recently changed jetting on it.

Sorry for the mix-up.

thanks

Share this post


Link to post
Share on other sites

I run a 75 pilot, idle fuel screew 2 turns out, I have to go in 1 turn to pass emissions. Starts first kick, solid idle, runs cool, no hesitation, no popping on decel, spark plug is 4 years old, don't know what it looks like but it allways runs good so I don't mess with it. I do have a UniFilter, side cover cut out and a Powerbomb with WB R-4 silencer :applause: allthough it don't do alot of silencing.

Share this post


Link to post
Share on other sites

When you guys say popping on decel, do you mean slowly throttling down, or cruising down a hill and completley closing the throttle? Just trying to get an idea of what my bike should be doing.

And to add the little jetting experience I have with my 650, i'm running:

175

68s

b3 needle 3rd notch

I'm in vermont and have the stock tip completely cored out and covered with a screen, an UNI filter and of course uncorked.

Before I cored the tip it was just drilled out and it seemed to be running a bit rich.

Share this post


Link to post
Share on other sites

Rolling off the throttle, I.E. going from 3/4+ to 1/4 throttle quickly, but not abruptly closing it all the way. I get a gentle series of pops, not loud or harsh.

1 person likes this

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

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0