1977-2000 Suzuki DT5/6/8 Outboards Service Manual, Page 41Get this manual
40 ENGlNf fNGINf SERVICES
CYLINDER HEAD De-earbon the combustion Overheating tendency lack of output power is usually explained excessive formation the surfaces of these
Check the gasketed surface of the cylinder headCYLINDER is likely to accumulate in the haust port as shownSuch accumulations should removed with the flat tip of rod: plain screwdriver used for this purpose)
De-carboning Check the gasketed surface of cylinder head with straightedge and thickness gauge in the seven directions as shown, in order to limitLeakage of gases lack of output power is often due to excessively distorted cylinder headIf the clearance checked is 0.03 (0.0012 in) at part, correct the surface with #400 finer sandpaperThis accomplished the sandpaper surface plate the head against the sandpaperCAUTION: repairing the gasketed surface the above try to remove as little stock as possibIe, the piston crown might touch the cylinder head