Posted by JRSutton on August 02, 2011 at 06:41:36 from (75.130.109.233):
In Reply to: F20 help please posted by elroysdad on August 02, 2011 at 05:50:11:
So frustrating, isn't it?
Just keep going back to the basics. Air-gas-spark. Sounds like you've got the spark covered. If all plugs spark, and you're SURE they're firing at the right moment - that leaves gas and air.
Make sure you're getting air - that's an easy one. But also make sure your choke is operating, don't assume it is.
Then your left with gas - which is where the problem almost always lies.
Have you tried starter fluid (carb cleaner works too)? That's a good way to isolate the carb as the problem - just don't go crazy with the stuff. Spray some in while cranking. You only need to hear then engine run for a second.
If it does that, you can then assume your ignition system is at least ok, and that you're not getting gas through the carb.
First start with basic carb adjustments.
It doesn't take much at all to block the carb - you have to be meticulous when cleaning and reassembling. But even then, hooking up a gas line can introduce a little chip of rust or something that will undo all your good efforts.
Point being - don't assume just because the carb has been rebuilt that it's working. There's a good chance some crap got into it.
Other than that, I'd also adjust the valve lash. Old valve seats wear, if the valve lash isn't adjusted to compensate for that wear, they can get to a point where one or more of them won't be able to close tightly. But your compression test would show that - if you did it on all cylinders - either way, it should be adjusted anyway since it's easy to do.
Of course, make sure you're using fresh, clean gas. Completely drain the old stuff - don't just add new to old.
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