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Jerry/MT
02-28-2006 13:36:35
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Re: tea 2085 running rough in reply to Bruce in BC, 02-27-2006 21:40:48
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I always recommend that you begin troubleshooting poor running problems by assuring that you have a fat, bluish spark provided by the ignition system. If the spark is orangey r yellowish, find out why. (Bad coil, wrong point opening, corroded points,oil on points, loose or broken wire in primary circuit worn distributor shaft/bushing, etc)If you do have a good fat, bluis spark, move on to the fuel system, making sure that you first have adequate fuel delivery to the carburetor. If you have a drain plug on the carb fuel bowl, open the fuel valve at the tank, hold a can under the carb drain plug, remove the plug and observe the fuel flow. You should have a continuous gush of fuel out the drain for as long as it's open, but at least for 30 seconds. If you don't, you need to find out why. Some carbs have filter screens on the inlet elbow that clog up with debris, sometimes the outlet valve on the tank has a small screen or filter that clogged , etc..
Once have assured your self that you have a strong spark and adequate fuel flow, then begin to look for other problems. Are your plug wires connected in the proper sequence to match the engine firing order? Is the ignition timing correct? Check each item out systematically and write your results down.
You stated that the engine seems to run a little better with the bit of choke. That could indicate a lean condition but it can also be a symptom caused by a weak spark (richer mixtures are more easily ignited by a weak spark.)The backfire could be retarded ignition timing, incorrect firing order, or a burned or maladjuted valve.hope this helps.
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