Searched all Weber related posts but my issue not directly addressed.
Just finishing up and driving daily now a multi year frame off restoration : 1966 FJ45 ( BC truck for its whole history) / freshly rebuilt F engine/ tranny/transfer case/ all running gear/ ADDED: front GM Monte Carlo discs ( JTO) and rebuilt rear drum systems and added mid 70’s AISIN dual circuit 7/8” master and booster ( much angst getting the brake system tuned and working...different post); electronic ignition (HEI...works well; power steering ; redone interior; body off paint job.......in short, THE WORKS
ALSO CONVERTED to WEBER 32/36 ( Man A Fre I think?....supposed jetted for F/2F engine). Followed WEBER initial set up instructions WRT mixture screw ( 2 turns out initially and ear tune from there...
Also timing set and checked twice ( timing light / per FSM 7 BTDC). Also ...no vacuum leaks...all new vacuum , fuel lines.
THE ISSUE: truck runs great on primary Weber circuit but falters, occasional backfire with pedal to the metal ( ie secondary fuel circuit kicked in. Difficult to get over 60 mph ( not that that’s where I want to cruise but need to get carb issues sorted out so that I could....).
THE QUESTION: appears truck floods when secondary fuel circuit kicks in. There appears to be no WEBER 32/36 adjustment for secondary circuit except changing jets ( smaller in this case?). Other avenues to pursue or should I be re-jetting smaller?
Just finishing up and driving daily now a multi year frame off restoration : 1966 FJ45 ( BC truck for its whole history) / freshly rebuilt F engine/ tranny/transfer case/ all running gear/ ADDED: front GM Monte Carlo discs ( JTO) and rebuilt rear drum systems and added mid 70’s AISIN dual circuit 7/8” master and booster ( much angst getting the brake system tuned and working...different post); electronic ignition (HEI...works well; power steering ; redone interior; body off paint job.......in short, THE WORKS
ALSO CONVERTED to WEBER 32/36 ( Man A Fre I think?....supposed jetted for F/2F engine). Followed WEBER initial set up instructions WRT mixture screw ( 2 turns out initially and ear tune from there...
Also timing set and checked twice ( timing light / per FSM 7 BTDC). Also ...no vacuum leaks...all new vacuum , fuel lines.
THE ISSUE: truck runs great on primary Weber circuit but falters, occasional backfire with pedal to the metal ( ie secondary fuel circuit kicked in. Difficult to get over 60 mph ( not that that’s where I want to cruise but need to get carb issues sorted out so that I could....).
THE QUESTION: appears truck floods when secondary fuel circuit kicks in. There appears to be no WEBER 32/36 adjustment for secondary circuit except changing jets ( smaller in this case?). Other avenues to pursue or should I be re-jetting smaller?