1988 "CC" Colt / Junior thru 8 Models Service Manual, P/N 507659, Page 73Get this manual
Trouble Check Chart (Cont TROUBLE 3LOSS OF POWER (Providing Ignition OK) (Cont) POSS BLE CAUSE
EOVERHEATING POW ERHEADSee Section 4
Thermostats damaged Thermo cover or gaskets damaged Pressure control val ve damaged Exhaust cover gaskets Ieaki ng Head gaskets leaking (warped head) (water in cylinders) Water intakes obstructed Pump housing air bleed restricted Water passages obstructed Pump plate not seal ing (bottom) Pump mpell er damaged Motor too high on transom Pump housing distorted (overheating) Pump housing cover seal worn (driveshaft grooved) Water tube grommet damaged FGEARCASESee Section Propeller hub sl ipping Bent or worn propel Ier Bent gear housi ng or exhaust housi ng Incorrect propel er ASPARK PLUGSSee Section Cover or inner terminal damaged (terminal point out of Tlead Fau ty Ieads or crossed leads Loose spa rk plugs (low torque) Defective spark plugs (cracked insulatorIncorrect spark pi ugs BIGN ITIONSee Section Incorrect timing Loose wiring (connectors improperly joined) Coils damaged Arcing around ignition coils Loose connect ions to sensor coi Is, charge coils, ignition coils, or on power pa ck ground lead Leads grounding out on sensor coils, charge coi Is, igni tion coi Is, or key sw tch Sensor coi Is Charge coi ls Power packs Arcing in key switch CFUEL SYSTEMSee Sect ion Recirculation hose plugged or pinched Recirc ulation nipple plugged Recirculation check valve stuck open Recirculation hose not routed correctly causing restriction Mani fol check valve pi ugged or restri cted Carburetor idle system has foreign particles in passagesPri me va ve seat has forei gn parti Ies on seat and wi II not shut offCarburetor fI oodi ng Fuel pump diaphragm leaking into crankcase Primer bulb check valve not operating DSYNCHRO IZAT ION AN LINKAGE ADJ USTMENTSSee Section Throttle plate synchronization andor throttle cam pickup incorrectly set Engine idl speed set too low Check these items if engine stalls