arcing

Well i was syncing my carbs at dusk and noticed the sparkplug boots(where they attach to the sparkplug) on my #3 and #4 cylinders were randomly arcing against the head! damn:ummm:, that might explain some tuning issues im having, so whats the best route to go? i figure i might as well get all...

So yesterday I finally got my carbs back together, and refitted them to the bike. Got it started, warmed up, idle set, carbs synced again. By then it was dark, and as I took a good look at the running motor to make sure of no leaks and everything A-ok, I noticed, on my rear left cylinder...

When my bikes warms up I can hear a snapping coming from mainly the left rear plug and some from the right rear but not quite as much.If I touch them of course i get shocked and i noticed if i touch the frame and boot at the same time the motor dies,Can those hard plastic boots go bad?,the...