Re: Intake woes! Leak or lean carb.?
The exhaust glowing obviously is excess fuel burning in the
headder and cat. Lean misfire can cause that, or too much
Sounds too rich - but those numbers aren't showing it, possibly
because the cat's doing a great job burning off the excess.
The sniffer test is behind the cat, so the engine can be
really dirty and the cat can compensate for it.
Kinda like running behind the horse with a shovel.
I'd bet if you disabled the cat you'd see it's really rich.
If it was too lean, the heat is developed in the engine, not
the exhaust, so your temp gauge should show it more, and
you'd notice poor performance too.
If it was one cylinder misfiring causing excess fuel in the
exhaust, you'd be complaining of the misfire as well.
Follow procedures for rich condition.
And - try the Mexican tune-up - could be a spider or bug
took up residence in the carb - air bleed or emulsion tubes.
Rev to 2500-3000, choke the carb off completely with your
hand until it dies. Restart, do it again.
The high vacuum created by choking it like that can suck
that spider out and any other trash or water that may have
It's not a cure-all, but sometimes it works, fast, cheap,
and it's a good trail fix.
Let us know how it turns out.