I have a pair of 2005 225 Optimax’s owned since new. All coils were good but I was not reaching my normal max rpm’s at WOT. While I have changed out the plugs several times, I had never changed the spark plug wires. Upon changing the cables, problem solved with full expected max rpm’s at WOT (in my case 5400 rpm’s) and a noticeable increase in power across the rpm range.
Good video. I have a Mercury 250 xs that has never gotten up to wide open RPMs which should be about 5600. I’ve had the fuel injectors sent out to be cleaned and flowed. That didn’t help much still low RPMs. Compression is good on all cylinders. I did a drop test on each coil and they were ok. Is the drop test a reliable test for the coils or should I use the resistance test too?
A resistance test is more thorough, but takes a lot longer to test. A resistance test will undoubtedly find an intermittent coil, whereas a drop test will only test for a potential voltage drop. Thanks for watching!
Can you post the ohm resistance specifications for the driver dual coil which has a 4 prong and 2 prong connection then the coil itself which has the 3 prong connection
I have a 2004 efi motor with coils that have 5 pins and are identical looking to yours, if they’re all the same, all of my coils fail the pin D test. Do you think they are the same coils and all of mine are actually bad or do you think my coils are different? As far as I know all the two strokes used the same coils
I have a pair of 2005 225 Optimax’s owned since new. All coils were good but I was not reaching my normal max rpm’s at WOT. While I have changed out the plugs several times, I had never changed the spark plug wires. Upon changing the cables, problem solved with full expected max rpm’s at WOT (in my case 5400 rpm’s) and a noticeable increase in power across the rpm range.
That's awesome! Those spark plug wires are just as important as the coils! Thanks for watching!
Thanks, good info
You're welcome. Thanks for watching! 👍
Good video. I have a Mercury 250 xs that has never gotten up to wide open RPMs which should be about 5600. I’ve had the fuel injectors sent out to be cleaned and flowed. That didn’t help much still low RPMs. Compression is good on all cylinders. I did a drop test on each coil and they were ok. Is the drop test a reliable test for the coils or should I use the resistance test too?
A resistance test is more thorough, but takes a lot longer to test. A resistance test will undoubtedly find an intermittent coil, whereas a drop test will only test for a potential voltage drop. Thanks for watching!
Can you post the ohm resistance specifications for the driver dual coil which has a 4 prong and 2 prong connection then the coil itself which has the 3 prong connection
I have an 2004 optimax 200hp with the other style of coil.
Did you ever resolve the slight missing issue?
Yes, the slight miss is gone. The new plugs and coil solved the issue. Thanks for watching!! 👍
I have a 2004 efi motor with coils that have 5 pins and are identical looking to yours, if they’re all the same, all of my coils fail the pin D test. Do you think they are the same coils and all of mine are actually bad or do you think my coils are different? As far as I know all the two strokes used the same coils
Are we talking about a Mercury motor? If ALL of your coils fail the pin D test, then I don't see how your motor would run at all. Does the motor run?