Turning in clockwise, will richen the pilot mixture. Look through the jets once they’re out and make sure you can see through them. Fuel is metered through the main by the jet needle at different throttle positions. Symptoms of Lean and Rich. A generator will generally stall with the choke turned off if either there too little fuel relative to the amount of air, or too much air relative to the amount of fuel. The pilot jet is a 30. Air cleaner clogged, poorly sealed, or missing. Incorrect jet sizes. A leaky needle / seat will. It is usually located near the back or air box side of the carb. Piston ring/land clearance excessive Choke; Your motorcycle carburetor pilot circuit has two adjustable parts, pilot air or fuel screw, and the pilot jet. Clogged jets are the number one reason a carburetor doesn’t work right. 2 Stroke Carb Jet Cleaning 04-24-2016, 05:56 PM. 50:50 100 octane and pump premium with Maxima 927 at 50:1 BTW, two stroke oil choice is like chain cleaning. Needle jet/jet needle - Mid range circuit. If the jet is still clogged, pass a small, stiff wire through the jet and soak the jet for another 10 minutes. If it is more than 2.5 turns from closed, you need a smaller pilot jet. When the carburetor is out of adjustment, it means the air/fuel screw and the balance between two or more carburetors need to be adjusted. I just got a range of main jets 330,320,310, 220-140 in increments of 5, and 100 but i don't have any other size pilot jets. These are easily clogged especially when ethanol gas is used. S. But like I mentioned, the carbs need a total clean and kit installed. 1998 S115TLRW I experienced power loss as rpms approach 3300. ... more throttle it wasnt there. Incorrect adjustment can produce any of the previously noted symptoms. Jet needle and needle jet. The pilot jet meters fuel to the “bottom end circuits” 2) Air screw – Meters air to pilot jet. Reinstall the jet into the carburetor and repeat as necessary. On multicylinder machines, with separate carburetors for each cylinder, the following symptoms are typical of an adjustment problem: Just use what you like. Reply. Raced sunday and about 2/3 of the way, bike lost all its power. The fuel mixture can be made lean or rich by operating the screw controlling the flow of air or gasoline. Main jet. I thought another fouled plug, changed plug and that did not help. Sooo, I need to clean out the pipe(s). We run it on our favorite 50:50:50 mix. Cold starting and warm up. The emphasis here is to find a pilot jet that will run crisp without bog and without the main jet. Turning out, counter clockwise, will lean out the pilot mixture. If your air screw is less than 1 turn from closed, you need a larger pilot jet. Throttle slide with a cutaway. I swapped the 330 jet that I had in originally for a 155 and the bike does the same thing. Main Jet - Wide open. BTW our 144 runs stock pilot and main jets with the needle lowered one clip (leaner) and hasn't fouled a plug since I re-did the bottom end when we got it. Cylinder, piston or rings worn or broken. Incorrect fuel level. There’s usually at least two in there; one is a primary jet and the other is a secondary jet. Choke circuit - Initiated by a valve or butterfly that increases the vacuum and opens the circuit up. Low compression: Spark plug loose or damaged threads. ... Clogged jets won't make it flood. Cylinder head nuts not torqued properly. Starter jet clogged or restricted. Save Share. Pilot circuit. The air screw position determines this for you, making it very simple. Slow jet or air passage clogged or restricted. Average setting for most 2 strokes is 1 to 2 1/2 turns out. Noticed silencer full of goop on the end.. not typical 2t poop, but the grate was completely clogged and no smoke or exhaust coming out. 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