Coosa River
Seaman
- Joined
- Nov 5, 2009
- Messages
- 52
I'm gonna attempt to give basic info first.
This is a 1971 20hp (200) twin cylinder merc in the 299.... ser# model.
The motor cranks/runs at idle, and at high idle, but starts cutting out and bogging when trying to accelerate . Realizing that these stators on this make has split of low rpm, and high rpm sides to it.....I assumed the the high side of my stator was going/gone bad. While attempting to do resistance checks on the stator with a volt/ohm meter, I just happen to throw my meter leads across the coil terminals....between + & - . I got about 800 ohms resistance on one coil, and can't find any resistance on the other (in otherwords completely open).
Here's what's got me puzzled.....I pulled both spark plugs out, and turn the crank by hand....seen a good spark at both plugs.....so I assumed both coils were working at least to some degree, so I started thinking stator trouble. Is it possible that this 0 resistance coil is working at low rpm, and then quitting at high rpm. The 0 resistance thing has got me puzzled as to why it's throwing a spark at all.
The difference between replacing a coil and replacing the stator is about $250. I haven't been able to rule out a bad stator either....but sure don't want to buy one if I don't have to.
The stator wires are all molded into the unit on this model (so you can't disconnect wires for the recommended book checks) .....about all I can do is check voltage going to the points from the stator....but with the thing not getting up rpm's , there is really no way to see if I have increased voltage as the motor speeds up.
Got any idea's about this weird coil reading resistance on one, and why would it even work (spark) at all....even at low speed.
Been scratching my head with this thing for a few days now.......got any advice on what I should do next....or what to try to check next. For the money, I'm thinking about just replacing both of these coils so I can eliminate the question mark with them......and then go from there. I just hate buying parts that I don't need.
Thanks for any replies/comments/advice,
Coosa River
This is a 1971 20hp (200) twin cylinder merc in the 299.... ser# model.
The motor cranks/runs at idle, and at high idle, but starts cutting out and bogging when trying to accelerate . Realizing that these stators on this make has split of low rpm, and high rpm sides to it.....I assumed the the high side of my stator was going/gone bad. While attempting to do resistance checks on the stator with a volt/ohm meter, I just happen to throw my meter leads across the coil terminals....between + & - . I got about 800 ohms resistance on one coil, and can't find any resistance on the other (in otherwords completely open).
Here's what's got me puzzled.....I pulled both spark plugs out, and turn the crank by hand....seen a good spark at both plugs.....so I assumed both coils were working at least to some degree, so I started thinking stator trouble. Is it possible that this 0 resistance coil is working at low rpm, and then quitting at high rpm. The 0 resistance thing has got me puzzled as to why it's throwing a spark at all.
The difference between replacing a coil and replacing the stator is about $250. I haven't been able to rule out a bad stator either....but sure don't want to buy one if I don't have to.
The stator wires are all molded into the unit on this model (so you can't disconnect wires for the recommended book checks) .....about all I can do is check voltage going to the points from the stator....but with the thing not getting up rpm's , there is really no way to see if I have increased voltage as the motor speeds up.
Got any idea's about this weird coil reading resistance on one, and why would it even work (spark) at all....even at low speed.
Been scratching my head with this thing for a few days now.......got any advice on what I should do next....or what to try to check next. For the money, I'm thinking about just replacing both of these coils so I can eliminate the question mark with them......and then go from there. I just hate buying parts that I don't need.
Thanks for any replies/comments/advice,
Coosa River
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