Dear MXA,
I bought a used 2003 Suzuki RM250 and the jetting is awful. Can you help me?
Suzuki's box stock jetting in 2003 left a lot to be desired. Here is what we ran on our sea-level RM250 race bikes back in 2003. We went down to a 165 main from the stock 175, leaned out the 48 pilot to a 45 and replaced the stock 6.5 slide with a leaner 7.0 slide.
If you have a question, send it to mxa@hi-torque.com
