2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 151Get this manual
Power Unit Mechanical: Valve guide replacement CAUTION Be careful not to damage cylinder head when replacing valve guide1) Using valve guide remover, drive valve guide out from combustion chamber side towards valve spring sideNOTE Do not reuse valve guide once it has been removedAlways use new valve guide (oversize) when assemblingSpecial tool (A): 0991644310 (Valve guide remover)
3) Install valve guide to cylinder head Heat cylinder head to temperature of 80 100 (176 212 F)Apply heat uniformly so that head will not be distorted Use special tools to drive new valve guide into holeDrive in new valve guide until special tool (valve guide installer attachment) contacts cylinder head After installing, check valve guide protrusion "a"Special tool (D): 0991658210 (Valve guide installer handle) (E): 0991787010 (Valve guide installer attachment) Valve guide protrusion "a" Standard (IN EX: 10.8 11.6 mm (0.43 0.46 in