What's the best size slow jet for a crf450r with a white brother aluminum pro exhaust?
My bike is running to lean and I need a smaller pilot jet than is in it and I don't exactly know what to get or how to find out
14 days ago
Location: Portland, OR, USA
Unfortunately you didn't let us know the year model that you are dealing with. To give you some insight, jetting is not an exact science and many variables play a factor, especially with four stroke models. The best thing that you can do so you are prepared for most conditions and elevations would be to purchase a jet kit. These kits come with various sizes and instructions to help you fine tune your bike. If you aren't interested in purchasing a kit, grabbing a few sizes up from stock will be the next best thing. Since there are no "set" sizes to run, you will always be fine tuning and changing sizes depending on climate, elevation and performance modifications.