Firstfives.org

Idle, rev it to 1500 - 2500, I can hear off throttle popping, (backfiring?) in the cat. Rrrrrevvv, poppity pop. RRRrrrevvv, poppity pop pop.

Now what did I do? I know it's timed right, valves adjusted ten thousands, twice, correctly.

It's unburnt fuel most likely, like someone adjusted your throttle switch to not engage at idle.

Indeed. My logic list rolled my eyes up to look between my eyebrows, with the tin woodsman's index finger ( if I only had a brain ) gesture to my temple. "Whats did I do'd that's not right ? "

Maybe try adjusting the idle cutoff switch again, as reading the L jet FAQ seemed to make it more important than tonsils.

I always like when doctors take stuff out ( tonsils, appendix, etc. ) and say you don't need it. Right. God being the original engineer.

So I did, adjust the idle switch. No more crackling of throttle.

Thanks.