1987 Banshee
 

Hello all, thanks for being here. I have an 1987 Banshee that actually sits more than it is ridden. Not for lack of love, but for health. My motor was custom built about 50 hours since 2009. It has a cool head, FMF pipes, 36 mm Keihan Carbs, KN filters, Boyeson Pro Flow Reeds, stock crank, 110 lbs compression, with no bleed down after ten hours, new OEM coil, yet I continue to foul my plugs, NGK BR8ES. Why?

Fouled plugs usually mean the engine is running too rich. You may need to lean your jetting down or find out why it's running rich.