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Join Date: Nov 2007
Location: Chandler, Arizona
If the bike sat for 2 months with no attention, both the battery is bad, and the carbs are probably gummed up. I also have a Battery Tender, and a fairly new MF AGM battery, the Battery Tender will show charged (green light), but after starting it up, and letting it idle for a few minutes, and shutting it off, the Battery Tender will show red for over 1/2 hour, which indicates that starting it and letting it idle for a bit actually slightly drained the battery.
The whole purpose of a Battery Tender is to protect the battery when it is just sitting there. It is not a charger, just a charge maintainer. If I understand you correctly, you did not have the Battery Tender connected to it the whole 2 months it was sitting there. If that is the case, you definitely need a new battery. Make sure you get a MF AGM battery. I use WestCo, but there are several brands available. Then I would drain out the gas from the carbs, remove the fuel lines from the petcock, and fill the carbs full of Seafoam through the fuel lines. Let it soak 24 hours, drain it out, reconnect the fuel lines, and use 2 oz Seafoam per gallon for the next few tankfulls of gas to finish cleaning the carbs out. Sitting is not good for a bike, especially the battery and the carbs. Jerry.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike