Learn how to install and tune a Lectron carburetor on a 2 stroke engine.
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Idle Screw
Turning it to the left lowers your slide height and your idle. Turning it to the right raises the slide height and your idle. If you adjust your idle too far down and the screw locks up, reach inside your carb, raise your slide up, and turn your idle screw clockwise until it catches again. If you lean out your rod, you will have to turn your idle down, and if you richen your rod, you will have to turn your idle up. Wait until your bike is warmed up and clears out before adjusting your idle.
Metering Rod
The metering rod is used in combination with the vacuum from the motor pull fuel from the float bowl. The flat side must always be facing the motor to do this. Don’t adjust it without running it first. It comes preset from the factory, and tuning it on the stand will not accurately represent conditions when the motor is operating under load at the track or on the trail.
To tune the rod, remove the slide and hold the slide to where the rod is pointing towards you. Turning it to the right will richen it. Turning it to the left will lean it. What you are doing is either threading it in and shortening the length of it (.006” per ¼ turn), or threading it out and adding length to it. Then, push the rod in towards the slide to collapse the spring and turn it back to where it is facing the motor to save your setting. You can use a set of calipers to measure the length of the rod and get back to the starting point (on your invoice).
Power Jet
The power jet is used to fine tune your top end and works like a faucet. If you turn it to the left, it opens the valve and richens it. If you turn it to the right, it closes the valve and leans it out. Tuning this has nothing to do with your idle or low to mid-range throttle response. NEVER ride with a closed power jet. If you are riding dunes, deep sand, outdoor motocross, or snow where you are wide open for extended periods, we recommend going ¼ turn richer to keep your motor cool. The fuel level in the line will be even with the level in your float bowl until the power jet is activated.
Cracking the throttle open is not enough to activate the power jet. The motor must be pulling a sufficient vacuum with the slide height over the bottom of the jet nozzle for about a second. Trying to activate it on a stand will usually not work because it is not under enough load to pull enough of a vacuum before revving out.
Most two stroke dirt bikes running pump gas will come with the power jet open between 3/4 of a turn and 1 1/4 of a turn from bottomed out.
Still need help? Check out our 2 Stroke Tuning Guide: bit.ly/3NcZH1M
3 июн 2014
