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'77 GS750. Spark, no spark.

  • Thread starter Thread starter capnjim
  • Start date Start date
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capnjim

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My poor bike. I didn't ride it once this summer. I did add fuel stabilizer and octane boost last fall. I did start it once or twice this summer and it fired up. Now that I actually hauled it out of the shed, it fired up for 10 seconds. Now, zero spark. Can a bad voltage regulator cause this intermittent problem? Last year, even when the bike was running I never got more than 12V at the battery. The bike ran fine 0-5k RPM but very rough after 5k. Could this be a symptom of a bad regulator?
Any quick things to look at?
Thanks
 
Charge battery and check points. In other words, basic maintenance.
 
I know...basic stuff. But I did a ton of stuff last summer. I bascially read and followed Cliff's site to the T. Carbs dipped, sealed, new O-rings all new intake rubber. New coils, wires plugs. I suppose I should start with a regulator change. I was just hoping someone else might have had a similar intermittent problem. Points are clean and gapped. I never set the timing, but, if it was bad it wouldn't be intermittent. Can a bad regulator cause this??
 
We found on my buddies 850 that there was corrosion on in the kill switch on the handle bar.
 
A bad regulator will cause the battery to run down. Typically though if there is enough juice to spin the engine via the starter, there should be plenty to throw spark.
 
I vote for clean the connections first. I had an 80 750T that had no charging voltage at all and the stator was throwing 70 at all 3 legs. Ceaned the regulator connections and had 13.9 at the battery instantly.

So a cold damp storage environment could have corroded some things and they need some cleaning and dielectric grease applied.
 
Thanks..I guess thats my next step. I will clean all the connections.
The bike is super clean, 40,000km (25k miles) and I have yet to have it running properly.
It was stored in a cold damp shed. Just kind of strange that it started several times in the last few weeks, then as soon as I haul it out of the shed, it starts instantly, idles at 3k for 5 seconds....then dies. No spark.
 
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