My Bj8 started popping and backfiring coming down hills. I balanced the carbs and adjusted the mixture with colourtune plugs but it still didn't go away so I tried again. I was poking around for the third time when I noticed that the rubber brake vacuum pipe to the inlet manifold was cracked. New pipe solved the problem. I still haven't satisfactorily balanced the carbs though. I have an instrument to measure the flow and get it nicely set up at 800rpm but when I put the air filters back on it jumps up to 1500rpm and I haven't figured that out yet. I manually adjust it with the pointers in the damper holes at the moment and that seems to work.
Just thought I'd pass my experience along.
AJ
Just thought I'd pass my experience along.
AJ