Fuel starvation?

Thinking main jet problems I've had the carb to pieces (twice) - washed/cleaned and blown it all out. No improvement. When reconnecting - there seems to be a decent enough gas flow through the drain plug.

At the begining of the season I redid all the electrics - plugs,wires,coil,points. Worked great after that. Also redid all 3 fuel filters. I've checked the points today - gap is fine. Checked the plugs - just a light brown color - no signs of oil or mixture problems.

As I say - it idles fine - but really doesn't react the screwing in/out on the idle jet adjustment - it'll even idle with the jet seated. And to get up past 1000 RPM I need the choke - and then its not really reacting to the main jet adjustment - and it seems to run best about 4 or 5 turns out from seated.

I'm not sure what to do next? Any advice ?
Thanks in advance.

Angus

1st I found the LT connection on the coil was loose. (well, OK, flapping in the breeze if you must know) ... so feeling somewhat foolish, I snugged that up and fired her up ... and ... uhuh... no difference!!

So I checked all the wiring ...nothing obvious, but finally, in deperation, thinking that maybe it was the contacts in the new ignition switch I'd put in in the spring - I jambed a screwdriver across the terminals ... fired her up and yipee, problem solved !!

... and then ...just to prove it - I removed the screwdriver - and it still ran OK ... so now I'm thinking wiring around the terminal block area.

But at least the good news is - the carb is all cleaned out and she's running better than before!

Many thanks for all your suggestions & advice.

One: The breather hole in the tank is plugged, and a vacuum builds up in the tank. Easy to check - when it's running bad, reach over and remove the fuel cap. If it improves, the vent is plugged. You can remove the tank and unplug the vent, or get a vented cap or drill a small hole in the cap.

Two: One or more of the 3 screens in the line is almost completely plugged. You say a good stream runs out of the carb when the plug is removed, but how long did you let it run? My guess is that the amount of gas that runs out of a carb is almost meaningless until you have let most of a gallon run out (and caught it, of course). Any less, and you haven't given the crud on the screen(s) time enough to strangle the flow.

Hope this helps!!

normally 3 good causes..

1, fuel obstruction

2. vacume leak

3, weak sparks.

In your case i'm really laying my money on fuel onstruction.

soundguy