Chapter 5. Carburetion; Carburetor - Yamaha YFM250XL(C) Service Manual

CARBURETOR

1 Vacuum chamber cover
2 Spring
3 Jet needle set
4 Piston valve
5 Pilot air jet
6 Coasting enricher
diaphragm
7 Starter plunger
assembly
8 Pilot screw set
9 Pilot jet
0 Needle jet
CARBURETION
A Main jet
B Needle valve set
C Throttle stop screw
D Float pin
E Float
5 - 1
CARBURETOR
SPECIFICATIONS
ID MARK 4XE1 00
MAIN JET (M.J.) #95
PILOT JET (P.J.) #42.5
JET NEEDLE (J.N.) 5CE35
NEEDLE JET (N.J.) P-2 (823)
PILOT SCREW (P.S.) 2 turns out
FLOAT HEIGHT (F.H.) 12 ~ 14 mm
(0.47 ~ 0.55 in)
FUEL LEVEL Å (F.L.)
1.0 ~ 2.0 mm
(0.04 ~ 0.08 in)
Above the float chamber
mating surface
ENGINE IDLING SPEED 1,400 ~ 1,500 r/min
CARB
5