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Idle speed carb vacuum issues

Posted: Fri Aug 09, 2013 7:15 am
by Gintoff
Hello friends. I took some time and took off and cleaned cylinder head , cleaned and tapped valves, changed pin on oil pomp's sprocket but when i assembled everything back I faced one issue: when engine runs at idle speed I cant sync carbs because vacuum meter goes wild, arrow jumps from positive pressure to negative, but when I hit throttle and in about 2500rpm, it goes almost steady in vacuum pressure. What's causing it?? :shrug: And how can I fox it, because I really want to sync my carbs and enjoy my reborn XJ :thumbsup: Thanks for your help riders!