Tach moving slowly

[gumby191]

Just the other day my tachometer stopped workin correctly. It just climbs real slow and won't go past 4,000 rpms. I think I heard somewhere that sparkplugs will do this but I'm not sure because the bike is still running fine. Also I checked the cable and it looks fine. Thanks

[BuzZz]

Bad plugs or other electrical problems can mess with an electronic tach. Yours has a cable so it sounds like a mechanical drive. If so, it is probably your drive cable. take it off and pull out the inner drive spring, clean it well, as well as the inside of the outter cable, then either use a light grease or oil to lube it before re-installing it. Check both ends of the drive cable for wear or rounding off.