Yamaha SR400 2014, Service Manual

Page: 32 / 342

ENGINE SPECIFICATIONS
2-5
2nd ring
Ring type Taper
End gap (installed) 0.30–0.50 mm (0.0118–0.0197 in)
Limit 0.80 mm (0.0315 in)
Ring side clearance 0.030–0.070 mm (0.0012–0.0028 in)
Limit 0.150 mm (0.0059 in)
Oil ring
End gap (installed) 0.20–0.90 mm (0.0079–0.0354 in)
Crankshaft
Crank assembly width 74.95–75.00 mm (2.951–2.953 in)
Runout limit 0.030 mm (0.0012 in)
Big end side clearance 0.350–0.650 mm (0.0138–0.0256 in)
Clutch
Clutch type Wet, multiple-disc
Clutch release method Inner push, cam push
Clutch lever free play 5.0–10.0 mm (0.20–0.39 in)
Friction plate thickness 2.74–2.86 mm (0.108–0.113 in)
Wear limit 2.50 mm (0.098 in)
Plate quantity 8 pcs
Clutch plate thickness 1.10–1.30 mm (0.043–0.051 in)
Plate quantity 7 pcs
Warpage limit 0.05 mm (0.002 in)
Clutch spring free length 34.90 mm (1.37 in)
Limit 33.16 mm (1.31 in)
Spring quantity 6 pcs
Push rod bending limit 0.20 mm (0.008 in)
Transmission
Transmission type Constant mesh 5-speed
Primary reduction ratio 2.567 (77/30)
Secondary reduction ratio 2.947 (56/19)
Final drive Chain
Operation Left foot operation
Gear ratio
1st 2.357 (33/14)
2nd 1.556 (28/18)
3rd 1.190 (25/21)
4th 0.917 (22/24)
5th 0.778 (21/27)
Main axle runout limit 0.08 mm (0.0032 in)
Drive axle runout limit 0.08 mm (0.0032 in)
Shifting mechanism
Shift mechanism type Shift drum and guide bar
Shift fork thickness 4.76–4.89 mm (0.1874–0.1925 in)
Kickstarter
Kickstarter type Ratchet
Decompression device
Device type Manual
Air filter
Air filter element Oil-coated paper element