On the carbs. get out fuel tank, then get out air filter with air reserve, and then you will see two whit nuts.
If it's an EFI engine you do not adjust the mixture screw. The mixture is computer controlled.
Set idle speed to proper r.p.m, by adjusting the IDLE SPEED SCREW. Turn the IDLE MIXTURE SCREW or the AIR SCREW to for correct procedure, achieve highest speed and best response. The IDLE MIXTURE SCREW (FCR) controls fuel delivery to the idle port and the SCREW is located on the engine side of the carburetor slide. Turning the IDLE MIXTURE SCREW out will make idle and off-idle richer. Turning IDLE MIXTURE SCREW (CR, PWK, PJ, PE) controls the amount of air to the IDLE and SLOW CIRCUIT. This SCREW is located on the air cleaner side of the throttle slide and turning the SCREW out will lean the mixture and turning the SCREW in (clockwise) will richen the mixture.
30psi in the front 35psi in the rear
Turn the idle mixture screw in to lean the mixture, out to richen the mixture.
To lean the carburetor, you should turn the mixture screw in (clockwise). This reduces the amount of fuel entering the mixture, resulting in a leaner fuel-to-air ratio. Conversely, turning the screw out (counterclockwise) will enrich the mixture by allowing more fuel to flow. Always make adjustments gradually and monitor engine performance.
If it has a carby there is a sealed mixture screw on the right side looking from the front. Drill out the the plug and the screw is behind it be careful not to damage carb
The mixture screw is typically located on the carburetor of a small engine, such as those found in lawnmowers, motorcycles, or chainsaws. It is used to adjust the air-fuel mixture for optimal combustion, and its exact position can vary depending on the engine design. In many cases, the mixture screw can be found on the side of the carburetor, sometimes labeled as "Mixture" or "Fuel." Proper adjustment can improve engine performance and efficiency.
To adjust the idle mixture screw on a Honda XR 70R, first ensure the engine is warm and running. Locate the idle mixture screw, typically found on the carburetor. Turn the screw slowly clockwise to lean the mixture or counterclockwise to enrich it, adjusting until the engine runs smoothly at idle. Make small adjustments and listen for changes in engine RPMs to find the optimal setting.
Try 1.5 turns out on the mixture screw for an initial setting.
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