140 looper,idle bounce

[bitsnpieces]

Not shure if this is even a problem,runs great at mid to full throttle but seams to shake while navigating the "no wake zones".Have rebuilt the carbs ,set idle timing to spec,changed plugs (champions),changed thermostats,water pump,head gaskets,compression is 130 on all 4.Don't know what else to check.Thanks for any reply.

 

[rodbolt]

Re: 140 looper,idle bounce

has it always idled like that? shaky idle on the 120/140 loopers was normal. mine would shake at 650 RPM yet idle from kitty hawk to manns harbour and back without shutting down.
about 14 miles.
some I have to play with the idle air jetting to smooth the idle to a stable 700 or so.
on extreme cases you have to play with both idle and intermediate air jets. lucky its all easily accessable.