Gs550t

[Guest]

Hi everybody,

I just finished rewiring my T with a M-Unit and Mbutton. Its a killer system, but, now it is not starting, it is backfiring both ways, into the airbox, and out of the exhaust. The only thing that has changed is the wiring. It ran previously, but the starter button circuit had some issues, it kept blowing the fuse after running for a minute,so I shelled out and rewired the whole bike. I have been searching threads, and have a few clues, but seem to have a unique situation. (Don't we all...)

Some details:
Doesn't have stock pipes, but it ran ok with these pipes previously.
As I mentioned i seem to have good spark. I cleaned the plugs and gave it clean fuel.
Charged the battery.
Drained the bowls but haven't cleaned the carb yet. However, that was done fairly recently.
I haven't double checked the advance....

I know this could be Fuel/Air, valve timing, or electrical.

I feel like I have the wiring right, my only concern is the 12volt to the CDI and the coils. Basically I have a 3 way connection from aux on the m-unit, two legs run to the orange/whites for the coils and one runs to 'the cdi orange and white. As I mentioned I have spark, I just dont know if it is right.

I guess I wouldnt be so confused if I didnt have spark, or if it hadn't roared to a start just a few months ago before the rewire. I was pretty confident that it was gonna run.

UGGGG!

Any help would be appreciated, especially if someone could send a pic or drawing of how 12volt should run to the cdi and coils, assuming i dont have a kill switch (which with the m-unit I don't).

Thanks,
Chris

[tkent02]

I'm sorry I can't find my ten foot pole.

[Clockeman]

I'm sorry I can't find my ten foot pole.

Do you think a ten foot pole would help?
Actually I think I have it, looks like I swapped the coil leads. Its starting, but needs a little tweaking. Thanks for the suggestion!

[cowboyup3371]

What's a M-unit and Mbutton? These bikes don't have CDIs but use an ignitor, completely different. You can get a wiring diagram for the bike as well as the service manual and other instructions for various repairs at http://members.dslextreme.com/users/bikecliff

[Clockeman]

What's a M-unit and Mbutton? These bikes don't have CDIs but use an ignitor, completely different. You can get a wiring diagram for the bike as well as the service manual and other instructions for various repairs at http://members.dslextreme.com/users/bikecliff

You can see the M-unit here. Its is pretty cool, and makes wiring pretty straight forward...with some exceptions..of which I seem to have found all of them.

http://motogadget.com/en/electrics/electronic-control-box-m-unit/m-unit.html

I have been going over the manuals and wiring diagrams for a while, and I am pretty familiar with the works as i replaced my coils and signal generator a year ago. Anyway, that's what was so confusing, it seems I had it basically done right, but I must have swapped the white and yellow/black leads from the ignitor (sorry about the confusion there) so I was firing in the wrong order. Haven't had time to look further, in desperation I swapped the plug wires and it is starting now, just needs a tune up. Just a case of a simple mistake causing me to question the whole thing.
Thanks for the help.