Yamaha F400A 2022 - Page 569

A-6
Model F450A/XF450 FL450A/XF450 F400A/XF400 FL400A/XF400
Timing belt
Installation height (bot-
tom of drive sprocket
[crankshaft] to bottom
of timing belt)
3.25 mm (0.1280 in)
Installation height (top
of driven sprocket to top
of timing belt)
0.75 mm (0.0295 in)
Installation height (top
of belt tensioner to top
of timing belt)
6.75 mm (0.2657 in)
Cylinder head assembly
Cylinder head
Warpage limit 0.10 mm (0.0039 in)
Journal inside diameter 25.000–25.021 mm (0.9843–0.9851 in)
Camshaft journal oil
clearance
0.020–0.061 mm (0.0008–0.0024 in)
Limit 0.080 mm (0.0032 in)
Cam chain
Chain length 114.33–114.58 mm (4.5012–4.5110 in)
Limit 114.85 mm (4.5216 in)
Cam chain tensioner
Maximum wear depth 1.00 mm (0.0394 in)
Camshaft
Cam lobe height IN 47.311–47.411 mm (1.8626–1.8666 in)
Limit 47.261 mm (1.8607 in)
Cam lobe height EX 46.600–46.700 mm (1.8346–1.8386 in)
Limit 46.550 mm (1.8327 in)
Journal diameter 24.960–24.980 mm (0.9827–0.9835 in)
Runout 0.030 mm (0.0012 in)
Fuel pump cam width
across corner (DI pump)
49.350–49.450 mm (1.9429–1.9468 in)
Valve clearance
Valve clearance IN (cold
engine)
0.17–0.24 mm (0.0067–0.0094 in)
Valve clearance EX (cold
engine)
0.37–0.44 mm (0.0146–0.0173 in)
Model F450A/XF450 FL450A/XF450 F400A/XF400 FL400A/XF400
Valve
Margin thickness IN 0.50–0.90 mm (0.0197–0.0354 in)
Margin thickness EX 0.90–1.30 mm (0.0354–0.0512 in)
Seat contact width IN 1.10–1.40 mm (0.0433–0.0551 in)
Limit 1.850 mm (0.0728 in)
Seat contact width EX 1.40–1.70 mm (0.0551–0.0669 in)
Limit 2.150 mm (0.0846 in)
Valve lifter
Outside diameter 30.964–30.980 mm (1.2191–1.2197 in)
Clearance IN (reference
data)
0.020–0.061 mm (0.0008–0.0024 in)
Clearance EX (refer-
ence data)
0.020–0.061 mm (0.0008–0.0024 in)
Valve stem
Diameter IN 5.477–5.492 mm (0.2156–0.2162 in)
Limit 5.447 mm (0.2144 in)
Diameter EX 5.464–5.479 mm (0.2151–0.2157 in)
Limit 5.434 mm (0.2139 in)
Runout limit IN 0.01 mm (0.0004 in)
Runout limit EX 0.01 mm (0.0004 in)
Valve guide
Inside diameter IN 5.504–5.522 mm (0.2167–0.2174 in)
Clearance IN 0.012–0.045 mm (0.0005–0.0018 in)
Limit 0.070 mm (0.0028 in)
Inside diameter EX 5.504–5.522 mm (0.2167–0.2174 in)
Clearance EX 0.025–0.058 mm (0.0010–0.0023 in)
Limit 0.080 mm (0.0032 in)
Installation height 11.30–11.70 mm (0.4449–0.4606 in)
Valve spring
Free length IN 48.08 mm (1.89 in)
Limit 45.68 mm (1.80 in)
Tilt limit IN 1.7 mm (0.07 in)
Free length EX 48.08 mm (1.89 in)
Limit 45.68 mm (1.80 in)
Tilt limit EX 1.7 mm (0.07 in)