Suzuki outboard motors 1988 2003 repair manual., Page 245Get this manual
POWERHEAD 7-33 compare the readings and determine if pressures are within the 15 psi criterion8If compression readings are lower than normal for any cylinders, try "wet" compression test, which will temporarily seal the piston rings and determine if they are the cause of the low reading9Using can of fogging oil, fog the cylinder with circular motion to distribute oil spray all around the perimeter of the pistonRetest the cylinderaIf the compression rises noticeably, the piston rings are stickingYou may be able to cure the problem by decarboning the powerheadbIf the dry compression was really low and no change is evident during the wet test, the cylinder is deadThe piston andor are worn beyond specification and powerhead overhaul or replacement is necessary10If two adjacent cylinders on multi-cylinder engine give similarly low reading then the problem may be faulty head gasketThis should be suspected if there was evidence of water or rust on the spark plugs from these cylindersrebuilding is largely subjective matter and one of personal worthIs the powerhead popular one, or is it an obsolete model? Are parts available? Is the outboard it's being put into worth keeping? Would it be less expensive to buy new powerhead, have your powerhead rebuilt by pro, rebuild it yourself or buy used powerhead? Or would it be simpler and less expensive to buy another outboard? If you have considered all these matters and more and have still decided to rebuild the powerhead, then it is time to decide how you will rebuild it The editors at Seloc" feel that most powerhead machining should be performed by professional machine shopDon't think of it as wasting money, rather, as insurance that the job has been done right the first timeThere are many expensive and specialized tools required to perform such tasks as boring and honing powerheadEven inspecting the parts requires expensive micrometers and gauges to properly measure wear and clearancesAlso, machine shop can deliver to you clean and ready to assemble parts, saving you time and aggravationYour maximum savings will come from performing the removal, disassembly, assembly and installation of the powerhead and purchasing or renting only the tools required to perform the above tasksDepending on the particular circumstances, you may save 40 to 60 percent of the cost doing these yourself� See Figures 14 and 15