i bought a toomey b1 exhaust and it says you can adjust some sort of needle on the carb, and i amjust wondering what exactly that does?
Carb needle?
- Thread starter 05blasterkid
- Start date
The needle in carb is connected to carb slide. If you take filter off and look in carb intake youll see a needle sticking down when you apply full throttle. That needle usually has a clip that you can move to change the needle height. The needle controls the bottom end of engine, low rpms, 1/4 throttle I think. To change pull top of carb off and pull cable and slide out. Needle is connected to slide, remove it. Moving needle down leans it out rising needle up richens it up. Remimber to move needle down you must move clip up, there will be several grooves on needle for clip movement. Needle controls some fuel flow.
Blaner
Your Friendly South African Ambassador
it controls your mid range, your pilot jet does the bottom end. its from 1/4 to 3/4 throttle, probably the most important part of your carb as you use it most, main jet only controls max throttle! very nb to get it right. Rasie the clip and hence lower the needle will lean out the mixture, and vice versa it may be the other way around, very confusing but it definately controls your mid range
With a toomey you'll most likely want to richen the needle cause you're gonna have much more flow than probably the stock exhaust that you've got. I would start with one below the middle, get a bigger main jet depending on your air filter setup and how much that's flowing, and go from there. A bigger pilot maybe too but you can fine tune it with the air screw so it depends.
