It’s a simple process, but it can make a big difference in how well your engine performs. With this chart, you can figure out the right drill size to use when you’re replacing your pilot jet. That’s where the Mikuni Pilot Jet Drill Size Chart comes in handy. So, picking the right pilot jet size for your particular engine and riding conditions is a must. On the other hand, if it’s too lean, your engine could overheat, backfire, or even stall. If your pilot jet is too rich, your engine might run crummy and your spark plugs could get messed up. Now, why is the pilot jet important? Well, it’s basically responsible for making sure your engine runs smoothly and responds well when you hit the throttle at low speeds. It’s got a little hole in the middle that lets gas flow through, and the size of that hole determines how much fuel gets mixed with the air. You know when your engine is idling or just starting up? That’s when the pilot jet is doing its job. For example, if the drill bit measures 1.06mm then your new jet size will be a 106 jet.Ī Mikuni pilot jet is a small brass gizmo in your carburetor that helps control how much gas is mixed with air when your engine is running slow. Once you get a good plug reading you can use the table below to determine the exact new jet size. It’s of utmost importance that you do not skip a drill bit size when drilling out your main jet because once you have drilled it to big then there is no turning back to You should repeat this process until you get a good plug reading. Run the engine with the drilled-out jet and take a plug reading again. If the reading is on the lean side then you will need to drill out the jet with a drill bit the next size larger. With the main jet still intact, run your engine and take a plug reading. To start the process of drilling out your main jet you first need to take a plug reading. You can narrow down what’s the ideal jet size your carburetor needs by drilling out the original jet to the more fitting size. Why buy a bunch of different main jets if you never use them again? This can happen if you don’t know what size will be the best starting point for your desired combination or when you buy main jets based on a guess. It can be a really difficult task when you want to decide what’s the correct main jet to buy when you want to tune your carburetor. Tips for Drilling Out a Pilot Jet and Installing a New One.What is a Mikuni Pilot Jet and Why is it Important?.
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