Google translator Friends. I have MH 4T 125 Motorhispania at home. Yamaha XT 125 engine. I started to unscrew it to clean the carburetor. After removing the tank, I see that instead of a tap there is something (what is it ??? on the photo at the top metal round) with 2 rubber tubes and 1 wire. The hose is for the fuel gauge, 1 carburetor tube and 2 rubber tubing at the cylinder. What is she for? Is it possible to assemble a regular tap with 1 pipe and do not do this to the rubber between the carburetor and the cylinder? Sorry, maybe these are stupid questions. But I only know old constructions.
It is a vacuum operated fuel tap. When the engine starts, the suction of the intake opens the fuel valve to let fuel into the carburettor.
If you can find a normal tap to fit the tank, you can. Then block the pipe on the inlet duct.
One more question. There is a Mikuni Ucal carburetor in this MH 125. How to set idle speed? This is a simple carburetor and there is no screw to raise the throttle as in our TTR.
If you pull the slide out and look down the hole, I think you will see the end of a screw which slots into a tapered groove on the slide. To raise the speed, twist the throttle open and turn the screw clockwise then release the throttle. The slide will sit a bit higher.
To lower the idle speed, turn the screw anticlockwise. This lets the slide drop further.
Unfortunately, there is no free spins. The screw was fully threaded, the throttle slightly rose and the engine went out. High turnover is. Carburetor clean. I don't understand what these spells are.
