When blowing snow at full speed it seems to run ok. On full speed, there is no backfiring, but there is a slight amount of surging. Flames shoot out of the muffler and loud pops are heard. Now the backfiring at idle is much worse. It started running a little rough last winter, then a little sputtering on idle, then toward the end of winter some backfiring and surging at all speeds, but most noticeably on idle. I can't say, however, I use it specifically for a stabilizer and would withhold comments to that effect. Was it gradual or did it just start this winter? Is the backfiring through the carburetor or the exhaust? Except for the surging, does the engine perform satisfactorily or is there a loss of power throughout the throttle range?Īs far as Sea Foam, I've used it frequently and rely on it for cleaning on engine carburetors, fuel injected cars, and injectors on diesel engines. Also a compression check would help point toward a valve issue, if that is the problem. If not, use a motor flush and change the oil, adding the Sea Foam to the oil. Since we're talking about trying something before going to the dealer with a $400.00 price tag, first try using the choke while idling to see if that changes the backfiring any. The surging is characteristic of a carburetor problem, but for the backfiring at idle I would at least check out the possibility of a valve issue - either sticking, leaking or possibly a cam problem. If you have been using Sea Foam as regular maintenance, I would be surprised if it is a varnished up carburetor. I think I would look at a couple of other things as well as the carburetor. I have had limited success with it as a stabilizer. I personally think Seafoam receives too much hype and is overrated. Be sure to blow passages and everything else out after cleaning.
Follow up by blowing out with compressed air. Spray as much cleaner as possible into the fuel passages. Valucraft Carb Cleaner will melt and wash away varnish. The cleaner will damage rubber so remove rubber carburetor parts to prevent damage. Use a full-face shield for eye and face protection. WARNING - Do not get “Valucraft Carb Cleaner” in your eyes or on your skin. I have not had many carburetors I could not clean. I have been very successful in cleaning carburetors with this cleaner. This is sold by Auto Zone parts store for around $2.50 per can. To clean carburetors I use “Valucraft Carb Cleaner” Part Number: AZ-4. You can use strands of copper wire to clean passages. Follow it to clean your carburetor and clean every passage thoroughly. The link below is for a Honda Carburetor Check Sheet.
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