just got a 34mm carb. it is oging on my blaster which is ported milled have a pipe k&n and thats about it. it came with a 150 main and a 50 pilot. what jets should i get? just need a range so im not shooting in the dark. thanks a lot
jetting. where to start?
- Thread starter 2kuik4muharemovic
- Start date
What brand of carb. did you get? Keihin and Mikuni are jetted using the same methods, but they use different systems for numbering the respective jet sizes. Anyways, regardless of which brand of carb. you have, these numbers sound just about right for a Blaster with the mods you are describing.
Check this link out. It is geared more towards Banshees, but the principles apply to any quad carburetor. You will learn a lot and I think it will help you find that starting point. Banshee Jetting FAQ
My advice: Jet 1-2 sizes richer than you think you'll need at first, and lean it out from there. Get the pilot jet and air screw set first, so that the engine idles smoothly and acclerates cleanly. After that, worry about setting the needle height and dailing in the main. If you have to go more than 2.5 turns out on the air screw, you need a larger pilot. Also, the engine must "4-stroke" noticably when the enrichener (some refer to it as the choke) is pulled out. If the engine runs better with the enrichener out (open) than in (closed), you need to jet richer. Good Luck!
Check this link out. It is geared more towards Banshees, but the principles apply to any quad carburetor. You will learn a lot and I think it will help you find that starting point. Banshee Jetting FAQ
My advice: Jet 1-2 sizes richer than you think you'll need at first, and lean it out from there. Get the pilot jet and air screw set first, so that the engine idles smoothly and acclerates cleanly. After that, worry about setting the needle height and dailing in the main. If you have to go more than 2.5 turns out on the air screw, you need a larger pilot. Also, the engine must "4-stroke" noticably when the enrichener (some refer to it as the choke) is pulled out. If the engine runs better with the enrichener out (open) than in (closed), you need to jet richer. Good Luck!
