2000 cr125r Jetting

[red_rider_elsinore]

I have a 2000 cr125r. I have installed a twin air filter, v-force intake, fmf exhaust, crankcase mods, and a dyna ignition. I have the stock jetting and it doesn't seem to run right. I installed a 37.5pilot and it run better but it was flat in the middle. I richen the needle but no good. I then installed a 370 main and no good. The spark plugs shows signs of the jetting being rich but it acts like it runs leans. I have no air leaks or oil seal leaks. The compression test showed 165lbs. Do you have any jetting recommendations as a starting point. Its frustrating to see my buddies bike rip and mine being a slow poke.

 

[marcusgunby]

I seem to remember the 2169 needle being the thing that helped with the jetting.

 

[Mr.250]

I have a Cr125 2000. Also a YZ250. My CR jetting was a B%^%^%& but I got some jet Numbas for you. 30/32.5 pilot/slow, 310/300 on the main. If it falls flat on the middle that means you are running way rich on the needle. Buy a Leaner needle, and set the clips to a leaner setting. Hope that helps.GO LEANER! Richening is the worst thing you can do to a Cr125 2000. Tell me how this worked out for you.

 

[red_rider_elsinore]

I am going to try the 32.5 pilot, 310 main and 2169 needle. Thanks for the tips.

 

[marcusgunby]

You sure it was 310 on the main not 410? what was std?

 

[red_rider_elsinore]

The standard jetting is 50 pilot, 360 main, 20-69 needle.

 

[marcusgunby]

sorry then im way off on my mains:( the 01 was alot richer i seem to remember.

 

[usgpru27]

01 is a 380 main stock.

 

[red_rider_elsinore]

How much do needles run? They're charging me 18 bucks at the local dealer and that seems a lot.