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View Full Version : Yamaha 50HP Model D Tune up



Nick Vorster
12-17-2005, 03:03 PM
Need detailed tune tune up instructions

jacobnorthwest
01-24-2006, 01:03 AM
"1)SPARK PLUGS NGK B8HS-10 OR BR8HS-10
2)GAP 1.0MM
3)IGNITION TIMMING@IDLE-5 ("")
4)CARB P/U-1
5)W.O.T TIMMING 25 UNDER LOAD
6)CARB IDLE JETS 1 3/4
7)IDLE SPEED NUETRAL 800RPM
8)IDLE IN GEAR 600RPM
GEAR OIL CAP 140Z
TACH POLE SETTING 6POLE
FULL THROTTLE RPM RANGE 4500-5500RPM
THERMOSTAT OPENING @118-126 F
OVERHEAT SENSOR ON 199F
IT IS RECOMMENDED FOR OPTIMUM PERFORMANCE AND ENGINE LIFE TO ADJUST THE WOT ENGINE SPEED TO TOP END OF THE RECOMENDED RANGE"

Mark Stevens
07-23-2006, 06:06 PM
I need the timing specs and if possible procedure on timing a 1993 Yamaha 70hp outboard. According to one person it's suppose to be 7 degree ATDC but can not it even close and am not sure this info is correct Thank you all for any help.