As long as you are checking things, what is the compression (psi) on one hole?
As long as you are checking things, what is the compression (psi) on one hole?
Not getting enough fuel, those insulators on the plugs are too white.
Lean situation = poping
Want them looking more like this for a good running engine.
View attachment 1715997372
I remember having lean backfires on my afb that a regular carb cleaning didn't fix. There are a few tiny air bleeds on the primary venturi that had to be poked clear with a thin wire I borrowed from a stainless bristle brush. Carb was actually usable after that.
These had plugged after sitting for a few years
I mentioned in an earlier post to swap out the vac adv canister . I had the same troubles 273 commando .. new can solved the issue. ..
I mentioned in an earlier post to swap out the vac adv canister . I had the same troubles 273 commando .. new can solved the issue. ..
defective part
You have it hooked up to ported vaccuum right Steve? like we talked on the phone about it should not move at idle at all.
OK it sounds like the ported has Vacuum at idle does it? It is not supposed to.
Steve you said at idle it went up with ported vac connected to the VA?. if there is any vac at all at idle out of the ported vac you have to take care of it first. Also you mighty vac'd the VA you said it was good. It is adjustable for rate only not total, look into that all first like we talked about. Ohm out he pick up it is probably fine do it hot and cold. From what I am reading it sounds like when the VA is hooked up it advances and stumbled which makes sense am I right? If so double check you have zero vac on the poted vac port and if there is adjust the throttle blades.
Awesome, glad you found the issue. Do you think it was a combination of both?