2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 148Get this manual
CAMSHAFTS
4Measure: camshaft-journal-to-camshaft-cap clearance Out of specification Measure the camshaft journal diameterCamshaft-journal-to-camshaft-cap clearance 0.0200.054 mm (0.00080.0021 in) Limit: 0.080 mm (0.0032 in)
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aInstall the camshaft into the cylinder head (without the camshaft caps)bPosition strip of Plastigauge onto the camshaft journal as showncInstall the circlip and camshaft capsNOTE: Tighten the camshaft cap bolts in stages and in crisscross pattern, working from the inner caps out Do not turn the camshaft when measuring the camshaft-journal-to-camshaft-cap clearance with the Plastigauge