Originally Posted by
Charles Godwin
Sounds like it MIGHT be rich on the LSN.
thats where I was going next, to rich on the bottom or carb venterical is to far open, RB engines like to just have a crack for an openning looking down the carb WITHOUT the restrictor in it for an idle setting, I would say 75% of the engines I see have the idle to high, pull the restrictor set the gap at 1mm, install the restrictor and re tune.