Re: At wits end trying to start 8n

Posted by Richard Scott on May 07, 2006 at 15:09:41 from (64.233.106.107):

In Reply to: At wits end trying to start 8n posted by monomechanical on May 06, 2006 at 20:42:47:

All that fuel running out, etc. you mention sure sounds like carb problems. Many of the ignition related suggestions, although they might cause your trouble, probably don't apply in your case since you are pretty well describing a carb problem.

Here's a simple test if you can shut off fuel flow to the carb: Make sure it is not still flooded. Crank with throttle & choke wide open & no fuel flow to clear the flooded carb. Then spray WD-40 into the carb while someone cranks it. If ignition is good, it should fire (WD-40 is a good substitute for starter fluid). If it fires, it ain't electrical.
And if it fires, it will probably run for a couple seconds, further confirmation it isn't an electrical problem.

However, note that if it does not fire, that does NOT necessarily mean that it IS an ignition problem. Could be valves, compression, etc.

No one has addressed your "gulping sound", but that does not sound like an ignition problem either. Considering the poor air draw & this gulping sound, if the WD-40 doesn't make it fire, I would do a compression check for step 2.

What has changed since last week when it last ran? Has it been left out in the rain? If so, maybe it is ignition after all--check distributor cap for any hard to see lines like little, tiny hard to see cracks or tracks indicating cross firing. If the cap is damp on the inside, the current will follow the path of least resistance and a plug in a cylinder under compression has more resistance than one which is not. This would explain your backfiring, but it doesn't explain the flooding.

Good luck & keep us posted. I spent 2 days out in the field last week trying to bleed my Yanmar's non-standard fuel system so I understand your frustration.

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