Yamaha YTZ250S 1986 Service Manual page 134

Item
el
YTZ250S
Clutch:
Friction Plate Thickness / Quantity
3.0 mm (0.12 in) x 7
Wear Limit <2.7 mm (0.11 in)
>
Clutch Plate Thickness / Quantity 1.6 mm (0.063 in) x 6
Warp Limit
<0.05 mm (0 .002 in»
Clutch Spring Free Length/Quantity <34.9 mm (1.374 in» x6
Clutch Spring Minimum Length
<33.9 mm (1 .335 in»
Clutch Housing Thrust Clearance
0.17 - 0.23 mm (0.0067 - 0.0090 in)
Clutch Housing Radial Clearance 0.03 - 0.55 mm (0.0012 - 0.0217 in)
Clutch Release Method Inner push, cam push
Push Rod Bending Limit
< 0.2 mm (O .OOS in)
>
Transmission :
Main Axle Deflection Limit <0.01 mm (0.0004 in)
>
Drive Axle Deflection Limit <0.01 mm (0.0004 in)
>
Shifter:
Shifting Type Guide bar
Guide Bar Bending Limit <0.05 mm (0.0020 in)
>
Kick Starter Type:
Kick and mesh type
Kick Clip Friction Force P
=
0.S-1.2 kg (1 .76-2.65 Ib)
tJ-'
Air Filter Oil Grade (Oiled Filter) Foam-air-filter oil or SAE10W30SE
Carburetor:
Type / Manufacturer
VM32SS / MIKUNI
J.D. Mark
lRX
Main Jet
(M.J .)
#320
Main Air Jet
(M.A.J.)
02.0
Jet Needle-clip Position
(J .N.)
6FS-4
Needle Jet
(N.J .)
P-4
Cutaway
(C.A.)
3.0
Pilot Jet (P .J.)
#35
Pilot Air Screw (P.A.S.)
2.0 turn out
Valve Seat Size
(V.S .)
01.5
Starter Jet
(G.S .)
#120
Float Height
(F .H.)
31.3±1.0 mm (1.23±0.04 in)
Engine Idle Speed
1500±50 rpm
Reed Valve:
Thickness*
(5
0
0.42 mm (0.0165 in)
Valve Stopper Height 9.4±0.2 mm (O.370±0.00S in)
Valve Bending Limit
*
0.6 mm (0 .022 in)
Fuel Pump:
Type / Manufacturer Mechanical Type/MIKUNI
Model DF52-75
6-10