The battery on my 72 commando vented acid from the breather pipe.I didnt notice till too lateresulting in a nightmare of corrosion at the alloy rear wheel, chain guard, brake linkage etc.
I checked the voltage at the battery and found it to be around 17vat about 4500rpm. I thought this could only be a faulty zener diode so I changed it. There is now about 13.5v at the battery at 4500rpm. I went for a ride and stopped after less than 10 miles to check for signs of the dreaded acid shower and found that it had happened again!! I cleaned the acid off best as I could and headed back home with the headlight on. On arrival there was again spots of acid at the rear end. Again I checked the voltage at the battery and it didnt rise much over 13.5v even if I revved the tripe out of it. Before all this happened the battery was recently new. Could it be damaged in some way. I founda firm selling batterys for motorcycles on the internet. They have a sealed gel type battery of 12ah that is about the correct physical dimensions to fit the commando. Would it be a good idea to fit one of these? I really dont want my bike getting anymore acid showers!!
Barry.
Hi Barry, I'm no expert,…
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Hi Barry, The obvious one…
Hi Barry,
The obvious one here is has the battery been over filled?
Level should be just to cover the separators; level should be indicated on case somewhere.
Check the voltage of the battery with the engine off, a fully charged 12v batt would read about 12.8 volts. May be you have a dud cell.
Ron C.
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Hi Barry,I'm no expert, but even when the battery is over charging it should not vent out acid, just gas. So it must be a faulty battery unless you have it unsecured and its jumping up and down. I run a small gel type battery on my 750 Commando, it works perfectly even holding full charge after the bike was not used for 3 months during last winter and its been fitted for over 5 years now.RegardsAlan.