speedbuggy67
Cadet
- Joined
- Jul 28, 2011
- Messages
- 7
I have a 1990 proline 250 walkaround with twin 200 mercury offshore 2.5ltr motors. ONe powerhead is a 1993 one a 1990 the problem engine is a 1993 that ran fine at one point. For the last year i've had a problem that im unable to solve. I've read and searched this sight over and over finally i decided to post. THe story is i came home from a boating trip and after coming through a no wake zone Port motor seemed down on power after traveling roughly 17 miles. I have two spare merc 200 offshore powerheads purchased for parts both have a bad cyl. and i've been swapping parts to try to solve....
The issue i have can best be described as one motor feels like a 150 and other a 200. When trying to get on plane one tach races up far faster then the other. I have done a compression check, about 130 on all six cyl, i swapped all 6 coil packs with one of the parts motors, switched out switchboxes, even swapped the ONE stator i have as spare (did ohm test on both seemed within spec don't have a dva meter) The other spare and other motor have different stator/regulator setup so i can't try it. 2yrs ago when i got this rebuilt powerhead fresh i put on 2 new voltage regulators since the tach wasn't working. I do all my own work on the motors and hate to throw unnecessary money at them. I have also swapped fuel lines from p to S motor and no change The fuel filter/water separator have also been changed as well as the little thumb filter on the motor. I put my hand in front of all six throats of the carbs so i didn't feel a reed valve was bad since i got good suction and no spitting. The only thing i can think of is either i'm throwing a defective part after another defective part or maybe its a carb issue. With 10 micron filter (if i recall correctly) the carbs should be fine i thought. Any help or suggestions would be extremely helpful! THanks in advance. My mechanic was out of idea as well and he's sharp. His only recommendation was the stator...
The issue i have can best be described as one motor feels like a 150 and other a 200. When trying to get on plane one tach races up far faster then the other. I have done a compression check, about 130 on all six cyl, i swapped all 6 coil packs with one of the parts motors, switched out switchboxes, even swapped the ONE stator i have as spare (did ohm test on both seemed within spec don't have a dva meter) The other spare and other motor have different stator/regulator setup so i can't try it. 2yrs ago when i got this rebuilt powerhead fresh i put on 2 new voltage regulators since the tach wasn't working. I do all my own work on the motors and hate to throw unnecessary money at them. I have also swapped fuel lines from p to S motor and no change The fuel filter/water separator have also been changed as well as the little thumb filter on the motor. I put my hand in front of all six throats of the carbs so i didn't feel a reed valve was bad since i got good suction and no spitting. The only thing i can think of is either i'm throwing a defective part after another defective part or maybe its a carb issue. With 10 micron filter (if i recall correctly) the carbs should be fine i thought. Any help or suggestions would be extremely helpful! THanks in advance. My mechanic was out of idea as well and he's sharp. His only recommendation was the stator...