Yamaha XT550J Service Manual page 15

2. Valve guide reamer
PIN.
YM-01227
This must be used when replacing the valve guide.
3. Valve seat cutter
PIN.
YM-91043
This tool is needed to resurface the valve seat.
4. Valve guide remover
PIN.
Y.M-01225
This must be used to remove the valve guides .
1-10
5. Valve guide installer
PIN.
YM-04017
This tool is needed for proper installation of the valve guides.
6. Valve spring compressor
PIN. YM-04019
This tool must be used for removing and installing the valve
assemblies.
7. Slide hammer set
PIN.
YU-01083
These tools are used when removing the rocker arm shaft .
1. Bolt PIN. YU-01083-1
2. Weight PIN. YU-01083-3