frank m

does anyone know if a cdi box from an 83 venture will work on an 85? have a chance to buy one to get my 85 running but dont want to get it if its not going to work.

85 venture has no spark on front cylinders at idle. rev to 2000rpm and spark is good.also tach drops to 0 when it happens. new plugs, plug caps,wires. checked tci for moisture. bike has been sitting for three years.any help would be appreciated.