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1985 9.8 sail power timing adjustment

# A144113 9.8 SAIL POWER 8P PROP 120 COMPRESSION BOTH CYL. MAX RPM @ WOT 4400...ON LOWE 1467 WT THINKING OF TRYING 7P PROP...maybe expecting too much out of this little motor...boat rated for 30hp.
 
Boat should be able to plane with one person.-----Is the motor running on both cylinders ?----What speed are you getting now?
 
racerone said:
Boat should be able to plane with one person.-----Is the motor running on both cylinders ?----What speed are you getting now?
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last lake test 7 mph... seems like plowing water at back end need to bring bow down...going to move two 45 lb batteries forward to mid boat and bring my 91 lb dog in the bow area and will let you know the outcome...had Vance Mfg manual adjustable jack plate with 6 in set back...cavitation plate was set at 1" above bottom of boat. motor is running on both cylinders with no misfires and plugs set at .035. even bought 7 p. Michigan prop never tried it yet. where should cavitation plate be adjusted to with 6 in. setback. starting to wonder if hub is possibly slipping even though it doesn't feel like it. forgot to mention also have new 8P Mercury prop. never tried it yet. Sorry i know i'm all over the board with this 9.8 with parts and thoughts and it's really getting very frustrating. any help will be greatly appreciated...will be retesting again in a week. thinking rpm's not at spec.
 
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