View Full Version : 1986 350 x back fire &slite black smoke ,motor fresh

12-22-2009, 02:33 PM
1986 350x with fresh motor but it backfires ,& has slite black smoke.friend say valave adjust is in order it has DG Xccel. muffler on it

12-22-2009, 04:29 PM
backfire through the exhaust or carb ?

Checking valves is easy enough , wouldn't hurt to do that