1985 GS1150 No Start, Battery Okay

[Mulkaccino]

I have a multimeter. I'm fairly mechanically inclined but not so much electronically (learning as I go; watching videos). What should I check for?

 

[posplayr]

I have a multimeter. I'm fairly mechanically inclined but not so much electronically (learning as I go; watching videos). What should I check for?

same as before

Realize these bikes have a clutch safety feature that requires you to pull the clutch in. You can disable it by shorting the two wires that go to the clutch perch. Other than that basic troubleshooting:

1.) With Ignition key on, Kill Switch on, you should have 12V nominal to the Coil (+) both coils. It it is too low (<11V) you have dirty contacts in Ignition switch and fuse box. Get some Deoxit and naval jelly to do chemical cleaning.

2.) The engine should now crank when you push the start button. If not, make sure there is 12V on the Yellow/Green wire at the solenoid (this could be blocked by the clutch safety feature above)when you push the start button and make sure there is a Black/White wire to one of the solenoid bolts (ground). You can jumper the two big poles also to just see if the starter will crank without using teh start button).

3.) If you measure the negative side of the coils, you should see them move between about 1V to 12V and continue to cycle as the engine cranks over. Each tome the voltage goes from 1V ==> 12V is when you get a spark (stick a screw driver into the high tension wire from one of the spark plugs and hold it near the head (metal) so it can arch. Should be able to jump a 1/8" gap but a blue spark. If the coil voltage is at say 10.5V you can have a hard start situation. Again cleaning contacts or going to the Coil Relay mod are typical solutions especially for the big bikes.

Get through this with some results and check back in.

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