spark plugs

I have a v twin 750 86 intruder; I noticed there is a small arc jumping from the spark plug to the head I was wondering wtf is going on!!! Bad ground? As well the battery is brand new and not barley holding 14v. It barley starts after sitting for a day. Just trying to take advantage of the few...

Alright im fairly new at working on bikes but im also mechanicly inclined. I have an 81 Suzuki GS550T. I removed the carbs and airbox cleaned the carbs and ditched the box it was beat-up pretty bad. Put it all back together, replacing my 95.5 main jets with 100's to com. for the new filters...

Hey, I'm new to the forum and I have an 1980 GS550. I've had multiple problems with this bike the most recent one is as follows: I can't tell if the fuel valve is on or off. My bike was running ok but I knew it needed new plugs. So I put a new set in yesterday, fired up, go to take off and it...