1998 B90TLRW Electrical Help (Coil packs/CDI)

[castires]

I just rebuilt this motor and it idles well on the muffs. I went to take it out today to break it in and found that it has no power once it is put into forward or reverse. I took it home and put it back on the muffs, I started the motor and the pulled the plug off of the #3 cylinder. The engine didn't flinch, so I left it unplugged and pulled the #2 plug off and again, it didn't have any affect, though this one gave me a little shock. Then I pulled the #1 plug and the motor died. So I believe the motor was only running on the single cylinder.

Can someone please help me trouble shoot this? I am not very good with the electrical aspect of the motor.

What I did try was the following:

1. Kept everything the same except swapped the wires on the #1 and #2 cylinders. The result was it wouldn't fire. If I swapped them back, it fired right back up.
2. I unplugged the #2 coil pack and plugged it into the #1 wire from the CDI and put it's cable on the #1 cylinder and it fired right up. If I took it and placed it on the #2 cylinder, the engine wouldn't fire up.

I'm wondering if the CDI unit is only putting out current to one lead of the three coming from it? I don't know how to safely check that. Also, I read that on some motors the #2 coil doesn't fire until a certain RPM, so maybe that is why it had no affect when disconnecting it. But I would assume disconnecting the #3 would have...

Any help would be greatly appreciated.

Thanks

 

[lmuss53]

Swapping the 1 and 2 wires and then it not running suggests a bad plug. You didn't bang them up when the heads were off did you? I would ask a mod to move this to the appropriate brand engine page and you'll get a much better response.

You should also get a spark tester that will let you test each plug wire, you want to see a hot sharp blue spark across a minimum 3/8 inch gap.

 

[Bondo]

Swapping the 1 and 2 wires and then it not running suggests a bad plug. You didn't bang them up when the heads were off did you? I would ask a mod to move this to the appropriate brand engine page and you'll get a much better response.

You should also get a spark tester that will let you test each plug wire, you want to see a hot sharp blue spark across a minimum 3/8 inch gap.

Ayuh,.... I would, but what's a "B90TLRW",..??..??

 

[castires]

Lol, sorry, it's a Yamaha.

 

[castires]

Also, the plugs are all 3 brand new.

Does it matter which coils are plugged into which of the three wires coming from the CDI unit?

I didn't notice anyway to tell from looking at both them and the coils themselves. If it does matter, how do I determine which goes where?