Yamaha MM700A Manual page 141

FUEL AND EXHAUST SYSTEMS
CAUTION
The jets must be scrupulously clean and
shiny. Any burring, roughness or abrasion
a
could cause lean mixture that could result
in major engine damage.
8. Check the movement of the float arm on the pivot pin.
It must move freely without binding.
9. O-ring seals tend to become hardened after prolonged
use and heat and therefore lose their ability to seal prop-
erly. Inspect all O-rings and replace if necessary.
10. Check the float for fuel saturation, deterioration or
excessive wear where it contacts the float arm. Replace as
required. If the float is in good condition, check it for leak-
age as follows. Fill the float bowl with water and push the
floats down. There should be no signs ofbubbles. Replace
the float if necessary.
11. Inspect the throttle shaft bearing and seal in the carbu-
retor body (Figure 34) for excessive wear or damage. If
the bearing or seal is excessively worn or damaged, re-
place the carburetor body.
Assembly
Refer to Figure 22.
1. Clean and inspect the carburetor assembly as de-
scribed in this chapter.
2. Install the pilot jet (Figure 32) and sleeve.
NOTE
Make sure the groove
needle jet fits around the pin
the
3. Install the needle jet through the top of the carburetor
so it protrudes through the bottom of the carburetor as
shown in Figure 29.
4. Install the O-ring (Figure 37) onto the fuel inlet valve
seat and install the valve seat into the carburetor body. In-
stall the valve seat retaining screw (Figure 31).
5. Suspend the fuel inlet valve by the clip from the float
tang (Figure 381, then install the float and inlet valve.
6. Install the float pin (A, Figure 30).
7. Install the main jet (Figure 28) and ring.
8. Check and, if necessary, adjust the float height as de-
scribed in this chapter.
9. Install the float bowl (Figure 27) and gasket.
135
(Figure 35) in the
(Figure 36) in