ok, i've noticed as of late that my bike tacho has been continually bouncing up and down while im riding and idling, sometimes bouncing up and down across a span of 3,000rpm. Now this is annoying as hell. As an example of how random it is, I pulled up at the lights, no throttle and clutch pulled in. engine sounded like it normally would (i'm guesing between 1500 to 2500rpm), but my tacho was bouncing between 10,000 to 12,000rpm. Any1 know what would cause this? I dont wan't to change anything yet till i know why its doing this. If it makes any difference, by bike battery is completely flat and I have to roll start it (as in it wont even attempt to crank and it doesn't even have enough power to release the latch on my boot unless the bike is running). I've been sourcing out batteries but all the places are out of stock till the new year. bike is a suzuki across. Cheers, Cam.