2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 136Get this manual
Power unit
Camshaft oil clearanceCamshaft cap inside diameter Camshaft journal diameter c: 0.020.06 mm (0.00080.0023 in)
3Measure the camshaft runoutReplace if out of specification
Checking the timing chain tensioner
1Measure the plunger extended length aReplace if out of specification
Camshaft runout limit: 0.1 mm (0.004 in) 4Measure the camshaft journal diameter and cylinder head journal inside diameter dReplace the camshaft and cylinder head if out of specificationNOTE: Check the timing chain tensioner every 400 hours of operationTiming chain tensioner wear limit a: 1.0 mm (0.04 in) from standard