Yamaha BWS CW50L Service Manual Page 15

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MAINTENANCE SPECIFICATIONS IsPECIA-161 MAINTENANCE SPECIFICATIONS
Model CW50 CHASSIS
Crankshaft: Model CW50
B__:J Steering system:
Steeringbearingtype Ballbearing
E- No/Size of steel balls:
Upper 22 pcs (3/16 in)
Crank width "A" 37.90 - 37.95 mm (1.492 - 1.494 in) Lower 22 pcs (3/16 in)
Runout limit "C" 0.03 mm (0.0012 in) Front suspension:
Connecting rod big end side clearance "D" 0.2 - 0.5 mm (0.008 - 0.020 in) Front fork travel 70 mm (2.75 in)
i Automatic centrifugal clutch: Spring Rate (K1) 10.8 N/ram (1.08 kg/mm, 60.46 Ib/in)
Shoe thickness 4.0 mm (0.16 in) Stroke (K1) 0 ~ 40 mm (0 ~ 1.57 in)
<Wear limit> <2.5 mm (0.10 in)> Spring Rate (K2) 14.4 N/ram (1.44 kg/mm, 80.61 Ib/mm)
Clutch shoe spring free length 26.2 mm (1.03 in) Stroke (K2) 40 ~ 77 mm (1.57 in ~ 3.03 in)
Clutch-in revolution 3.200 ~ 3.600 r.p.m. Optional spring No
Clutch-stall revolution 6.300 - 6.900 r.p.m. Rear suspension:
V-belt: Shock absorber travel 60 mm (2.36 in)
Width 15 mm (0.59 in) Spring free length 202 mm (7.95 in)
<Wearlimit> <13.5mm(0.53in)> Springfittinglength 187.5mm(7.38in)
Transmission: Spring Rate 32.5 N/ram (3.25 kg/mm, 181.93 Ib/mm)
Main axle runout limit 0.08 mm (0.003 in) Stroke 0 ~ 44 mm (0 ~ 1.73 in)
Driveaxlerunoutlimit 0.08mm(0.003in) Optionalspring No
Kick starter: Wheels:
Type Ratchet type Front wheel type Cast wheel
Kick clip tension 150 ~ 250 g (5.3 - 8.8 oz) Rear wheel type Cast wheel
Carburetor: Front wheel size MT 3.50 xl0
I.D. mark PHBN12HS Material Aluminium
Main jet (M.J.) # 93 Front wheel size MT 3.50 xl0
Main air jet (M.A.J.) 2.0 Material Aluminium
Jet needle (J.N.) A21-3/5 Rim runout limit:
Needle jet (N.J.) 2.110 Front 2.0 mm (0.08 in)
Cutaway (C.A.) 4.0 Rear 2.0 mm (0.08 in)
Pilot jet (P.J.) # 36 Front disk brake:
Bypass (B.P.1) 0.8 Type Single disk
Pilot air screw (A.S.) 1-5/8 _+114out Diameter & thickness 155 x 3.5 mm (6.102 x 0.137 in)
Valve seat size (V.S.) 1.2 Pad thickness 3.25 mm (0.127 in)
Starter jet (G.S.1) # 40 <Wear limit> <0.8 mm (0.03 in)>
Float height (F.H.) 15 - 17 mm (0.59 ~ 0.67 in) Master cylinder inside diameter 11 mm (0.43 in)
Fuel height (F.L.) 20.5 ~ 22.5 mm (0.80 ~ 0.88 in) Caliper cylinder inside diameter 30 mm (1.18 in)
(Center of float chamber / Fuel height) Brake fluid type DOT #3 or DOT #4
Engineidlespeed 1800_+200rpm Reardrumbrake:
Reedvalve: Type Leading,trailing
Valve stopper height 4.0 ~ 4.4 mm (0.157 ~ 0.173 in) Drum inside diameter 110 mm (4.33 in)
Reed valve clearance 0.2 mm (0.008 in) <Wear limit> <110.5 mm (4.35 in)>
Lubrication system: Autolube pump Lining thickness 4.0 mm (0.16 in)
Stroke 2.62 mm (0.10 in) <Wear limit> <2.0 mm (0.08 in)>
Bore 0.5 mm (0.02 in) Spring free length 54 mm (2.125 in)
Front brake lever freeplay: 10~ 20 mm (0.4 ~ 0.8 in)
Rear brake lever freeplay: 10 ~ 20 mm (0.4 - 0.8 in)
2-5 2-6
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