1998-2004 Yamaha WaveRunner XL700 XL760 XL1200 Factory Service Manual, Page 89Get this manual
'''''''''''''''''''''''''''''' '''''' SERVICE POINTS
Cylinder head inspection 1Eliminate: Carbon deposits Use rounded scraper CD
NOTE:Take care to avoid damaging the spark plug threadsDo not use sharp instrumentAvoid scratching the aluminum2Inspect: Cylinder head water jacket Mineral depositscorrosion Clean3Measure: Cylinder head warpage Out of specification Resurface