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Stator problem?

J

Joel Kann

Just got it firing!
GT Contributor
Joined
Dec 24, 2019
Messages
9
Location
Apex, NC
Riding the other day. Started up OK and restarted a few stops. Then after a few restarts it refused to start. Cranked, but no fire. Towed the bike home and checked the battery. 12.4v. Charged overnight to 13.4v. Bike fired right up. Battery test good on load test with 220 cranking amps. Replaced anyway since it is the original 2018 V7iii battery. Could this be another problem? Stator or Voltage regulator? How do I test these? I don't even know where they are located. I do SOME wrenching (minor repairs and maintenance and the dealer is 300 miles away.
 
You haven't given us any info to help with here. What did it show for voltage while cranking? You need to bring a meter with to check that. If it was way down and cranking slowly it could be the stator. I'd pull the cam position sensor, clean it off with a rag and check the clearance. I'd also pull and replace the plugs. They can tell the story most of the time.
 
Measure the voltage at the battery terminals with an accurate meter. Measure voltage with bike turned off, at idle, and somewhat higher (maybe 2,500 or 3,000 rpm). Report your measurements here for “the experts” to comment. I have not been around Moto Guzzi’s long, but I think you should have over 13 volts with the engine running (certainly that much at engine speed above 2,500).
 
I put a digital meter on the dash after my stator failure. It shows 14.6 at 3500. That being said, when started turn on everything electrical it has. Grips, high beam, turn signal, brake light etc. It should hold the 14+. If not one of the stator coils could be shot.
 
I get about 14.4v reving (no tach). Trying to replicate what would have happened at inspection, engineering be off, turn signals on, brake light on, high beam on, honk horn. 12.4 v
 
Tested again. 12.5 v off. Up to 14.4v with rev up. Drops to 13.4v with rev up and high beam (led), turn signal, and brake lights on.
 
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