Oh, a little rich and a leak at the intake or exhaust manifold can also
make a backfire.

Mike

Mike Romain wrote:
>
> I first think engine run on from a carbon build up in the cylinders.
> Did it have run on with the old carb? You can get top end spray that
> you shoot the whole can in the intake while keeping the throttle
> manually up so it doesn't stall. This can do wonders for that or a cup
> of water can be sucked in to a vacuum line on the manifold seeing as you
> can't slowly pour it in like with an updraft carb.
>
> The carb should have a 'button' on the bottom that raises the internal
> piston. When you push up on this, the rpm will raise if it's too lean,
> bog if it's too rich or raise a little then mellow back if the mix is
> just right.
>
> The piston pot has to have oil in the center under the screw cap. Up to
> the ridge I think it is. We used to use sewing machine oil, but that
> spits out fast, I think 10W30 was called for.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> (More Off Road album links at bottom of the view page)
>
> wrote:
> >
> > engine idling - i'm experimenting with air/fuel mixture,throttle idle
> > screw etc. backfires when i shut off engine. What does this backfiring
> > indicate? Thanks.