Unforcefull Force
Petty Officer 2nd Class
- Joined
- Jul 9, 2010
- Messages
- 128
1989 Force 125 Bored .30 over NOT RUNNING RIGHT! Please Help!!
Okay guys. I have been reading on here for weeks and I found nothing pertaining to the problems I am having with my boat/motor. I really hope someone will be able to help me. I will list everything that was done to the motor then tell you what exactly it is doing?
1989 Maxum Cuddy Cabin 19.5??
1989 Force 125
Bored .30 over
All new seals and gaskets
Carburetors were taken apart soaked overnight and rebuilt
New reed valves
New thermostat
All new hardware (grade 8 bolts)
Motor was put back together with anaerobic sealant
New starter
New fuel pump
All new fuel lines & ball
I am getting excellent compression across all 4 cylinders
Great spark across all four coils
TDC is right on point
Okay, after setting everything to the manufactures specifications as per the shop manual, the motor will not run properly:
The link for the carburetors is set properly and they are in sync.
Timing is set for the prestolite magneto system.
The two hash marks on the throttle adjustment are in the center of the roller.
One full turn out for the air mixture screw, then I found the sweet spot on each
The motor will fire right up, idle perfectly, run perfectly, throttle up perfectly BUT I max out at:
20-25 MPH 4000-4400 RPM
MOTOR WILL RUN 5000-5100 RPM 30-32 MPH WHEN I DO THE FOLLOWING: (but after throttling down I get severe engine chatter & idle stays 1500-2000 RPM for about 60 seconds, than slowly comes down).
Advance the timing 3/8?? further than the last timing mark on the flywheel. (the mark on the right)
Bring Idle adjustment down a little bit
Same Air adjustment
The previous owner said the boat used to go 40MPH @ 5500RPM (before rebuild, boat was not running properly when I bought the boat so we overhauled it).
I was thinking since I bored it, it should do somewhere around 40-45 @ 5500-6000RPM ?
-Thank you in advance!
Okay guys. I have been reading on here for weeks and I found nothing pertaining to the problems I am having with my boat/motor. I really hope someone will be able to help me. I will list everything that was done to the motor then tell you what exactly it is doing?
1989 Maxum Cuddy Cabin 19.5??
1989 Force 125
Bored .30 over
All new seals and gaskets
Carburetors were taken apart soaked overnight and rebuilt
New reed valves
New thermostat
All new hardware (grade 8 bolts)
Motor was put back together with anaerobic sealant
New starter
New fuel pump
All new fuel lines & ball
I am getting excellent compression across all 4 cylinders
Great spark across all four coils
TDC is right on point
Okay, after setting everything to the manufactures specifications as per the shop manual, the motor will not run properly:
The link for the carburetors is set properly and they are in sync.
Timing is set for the prestolite magneto system.
The two hash marks on the throttle adjustment are in the center of the roller.
One full turn out for the air mixture screw, then I found the sweet spot on each
The motor will fire right up, idle perfectly, run perfectly, throttle up perfectly BUT I max out at:
20-25 MPH 4000-4400 RPM
MOTOR WILL RUN 5000-5100 RPM 30-32 MPH WHEN I DO THE FOLLOWING: (but after throttling down I get severe engine chatter & idle stays 1500-2000 RPM for about 60 seconds, than slowly comes down).
Advance the timing 3/8?? further than the last timing mark on the flywheel. (the mark on the right)
Bring Idle adjustment down a little bit
Same Air adjustment
The previous owner said the boat used to go 40MPH @ 5500RPM (before rebuild, boat was not running properly when I bought the boat so we overhauled it).
I was thinking since I bored it, it should do somewhere around 40-45 @ 5500-6000RPM ?
-Thank you in advance!
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