niceoldgrady
Cadet
- Joined
- Oct 28, 2014
- Messages
- 6
I have a 1990 Yamaha 200ETXD which is only firing on the three right cylinders. The three left cylinders have no spark. I confirmed this using an old automotive timing light. Flashes on all three right plug wires and none of the left plug wires. I also removed all three plug wires of left side and engine still started and ran as it did before.
This 200 HP motor is on a 19' Grady White Tournament which I do not run hard. I noticed it running rougher than usual but I guess it has so much power in relation to the boat it is pushing it still motivated the boat along okay. I am amazed that this motor idles with three cylinders not firing.
1.) The ground between the cylinder head and block was cleaned and checks good.
2.) Checked for spark with motor in gear, no change. So must not be dropping three cylinders in neutral as a normal thing.
3.) All pulser coils have continuity and measure approximately 313 ohms
4.) One charge coil (Br and R) measures 736 ohms. The other charge coil (Bl / BkR) measures 73 ohms.
5.) All spark coils check good with an ohm meter.
6.) Compression 110 - 120 on all cylinders.
I am thinking that one of the charge coils is the issue given the difference in resistance. Interested in opinions or if anyone else has run into this. Could it be the CDI unit or charge coil? I notice there are two charge coils? Could it be that each is assigned to a bank of cylinders?
Any help / experience is appreciated.
This 200 HP motor is on a 19' Grady White Tournament which I do not run hard. I noticed it running rougher than usual but I guess it has so much power in relation to the boat it is pushing it still motivated the boat along okay. I am amazed that this motor idles with three cylinders not firing.
1.) The ground between the cylinder head and block was cleaned and checks good.
2.) Checked for spark with motor in gear, no change. So must not be dropping three cylinders in neutral as a normal thing.
3.) All pulser coils have continuity and measure approximately 313 ohms
4.) One charge coil (Br and R) measures 736 ohms. The other charge coil (Bl / BkR) measures 73 ohms.
5.) All spark coils check good with an ohm meter.
6.) Compression 110 - 120 on all cylinders.
I am thinking that one of the charge coils is the issue given the difference in resistance. Interested in opinions or if anyone else has run into this. Could it be the CDI unit or charge coil? I notice there are two charge coils? Could it be that each is assigned to a bank of cylinders?
Any help / experience is appreciated.