GS550 L not sparking

[Andyl]

Hi I've got a problem with my newly purchased GS550 L, there is no spark at the plug. There is a live to the coils and everything else seem to work, anyone got any ideas as to what it might be? I unfortunately have no workshop manual or wiring diagram. Thanks

[Toasty]

Bad plug wires? Is it only one cylinder or all four?

[Andyl]

Hi Toasty, its on all 4 that there is no spark. I have tried some different coils and still no joy.

[Toasty]

Hmm... Are the coil grounds in place and clean?

[Andyl]

Yes redone all the grounds, cleaned all connectors. I'm beginning to wonder if its the signal generator or something more serious

[JEEPRUSTY]

Just in passing what is the year of the bike.

[Andyl]

its 1979/80 it has the transistor type ignition.

[tom203]

Did you buy it in this condition, or did it fail later?

http://members.dslextreme.com/users/storagecliff/images/electrical_odd-n-ends.html#A17

Basscliff has pretty similiar wiring diagrams to offer clues

http://members.dslextreme.com/users/bikecliff/

[Andyl]

Hi Tom thanks for the links I bought it as a non runner, I've cleaned a lot of it up and ultrasonically cleaned the carbs, had hoped to just put some fuel in it and then fire it up...didn't work out like that though

[tom203]

Hi Tom thanks for the links I bought it as a non runner, ....

It might be something simple-like a connection- or worst case, the ignitor is no good. Do some testing. Lots of these critters get abandoned for simple stuff.

[sparki]

if there is power to each coil and you're sure that each coil is good then i'd put my money on a bad ignition box. see if someone will lend you one to test.... or better still, send yours to someone on here to test on a known good bike...

[tom203]

Here's a simple to follow 550 wiring diagram off Basscliffs

http://www.mtsac.edu/~cliff/storage/gs/550_Schematic.pdf