Questions & Answers for: Yamaha YZ 125 jet

How do you know you should go with a bigger main jet? What exactly would it do for my 2001 YZ 125? a bigger main jet will make the bike run richer which means more gas. unless you have changed ...

my yz125 runs like it is always cold, why? I just bought this Yamaha YZ125. It seems to run like is is always cold. If I run the engine up top and keep it there it seem to run a little better. I am ...

need spects for carburetor main jet on mikuni ucal and spects for pilot air jet 1 and pilot jet 2 http://www.cmsnl.com/yamaha-yz125r-2003_model11245/partslist/A-12.html Site above has all the parts ...

i have a 98 yz125, i race it but seem to have a lack in power in certain areas, ive changed my jetting a few times but seem to find the power else where and NOT where i need it, as of rite now im ...

what is the size of main jet of YZ125? Main Jet: 410 Main Air Jet: 2.5 Jet Needle: 6BFY43-74 Needle Jet: S-1 Pilot Air Jet 1: #40 Pilot Outlet: 0.7 Pilot Jet: 40

...shorty silencer the head is shaved 80 thousnths and bored 20 over .bike is burnin hott what size jetting should be used for main and pilot. stock is 420 mai i have 2004 yz 125 fmf phatty pipe with ...

... your not getting enough fuel. 1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet. 2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide. 3. 1/4 ...

... your not getting enough fuel. 1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet. 2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide. 3. 1/4 ...

...that has pretty much been just garage kept since bought new in 2006. I've cleaned the carb and jets and cleaned the plug. The jets were gummed up but its still cutting out high rpms or as u say ...

... your not getting enough fuel. 1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet. 2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide. 3. 1/4 ...