Yamaha F225A Service Manual page 93

15. Tighten the synchronizing screw 0 of
cylinder #4, and stop tightening when the
throttle plate starts to move. Similarly,
tighten and adjust the synchronizing
screw A of cylinder #6.
16. Tighten the port throttle stop screw 8
until it contacts the throttle body lever 9,
and then turn it one additional turn.
17. Start the engine and warm it up for 5 min-
utes.
18. Remove the plugs E of cylinders #1, #3,
and #5, and then attach the special ser-
vice tool and adapters to the intake mani-
fold as shown.
69J3D11
É
Vacuum gauge: 90890-03159
NOTE:
For best results, use a vacuum gauge (com-
mercially obtainable), like F or G shown in
the illustration, that has four adapters.
Throttle control
#1
#3
#5
S69J4310
4-18
1
2
3
4
5
6
7
8
9