POWERHEAD
90-826883R2 JUNE 1998 Page 4-23
57103
a
a - Decompression Ports
Exhaust Manifold and Exhaust Cover
1. Remove all carbon deposits and gasket material from exhaust manifold and cover.
2. Inspect for grooves, cracks or distortion that could cause leakage. Replace parts as
required.
Cylinder Bore
CHROME BORE -- ALL MODELS S/N OG202749 AND BELOW
Cylinder bores which are chrome cannot be bored orefficiently honed.Honing a chrome
cylinderboreisnotnecessarynorisitrecommended.Donotmistakecylinderboreporos-
ity (pitting) for cylinder damage. Porosity in a chrome lined cylinder is normal and is not
detrimental to engine operation or performance.
1. If chrome surface is flaking, or if a groove or any other mark penetrates the chrome
surfacing to the aluminum portion of the cylinder wall, the cylinder block must be re-
placed.
2. Todetermineifagrooveormarkonthecylinderwallpenetratesthechromesurfacing
to the aluminum cylinder wall, apply a small amount of diluted muriatic acid (TIDY
BOWL CLEANER) to the groove or mark. If the groove or mark begins to “fizz”, the
aluminum wall is exposed and the cylinder block and crankcase cover must be re-
placed.
3. Ifapistonisscoredandtransferredaluminumtothecylinderwalls,removethealumi-
num from the wall as follows:
a. Remove all loose aluminum deposits from cylinder walls with a stiff bristle brush.
b. Applyasmallamountofdilutedmuriaticacid(TIDYBOWLCLEANER)ontoalumi-
num deposits. A“fizzing” action will appear indicating that aluminum is being dis-
solved.
c. Leavetheacidsolutiononthealuminumdepositfor1to2minutes,thenwashcyl-
inder thoroughly with hot water and detergent.
d. Steps“b” and“c”mayrequirerepeatingseveraltimesbeforeallaluminumdepos-
its are gone.
e. Aftercleaningaluminum depositsfrom cylinderbores, applylight oilto eachcylin-
der bore with a clean cloth.
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