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Old 02-04-2021, 02:19 PM   #8
NH.Solar
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My former business was a large lawn & garden dealership in Concord, and after selling that I went to work for six years as the NE rep for a large manufacturer. Without exaggeration I have sold well over a half a million snowblowers.
The most common problem by far is stale gas in the carb bowl and blocking of the fuel pickup ports, but it is also usually an easy fix. These instructions won't apply to all engine manufacturers but they will apply to most;
1. Turn off the gas under your tank. 2. Remove the nut at the bottom center of the bowl while holding the bowl up against the bottom of the carburetor. If the issue is just a little ice or dirt you may not need to drop the bowl and it will hang stuck under the o-ring between the bowl and carb. 3. The nut you removed will likely have a pencil lead hole at its base, close to the actually thin faced nut (most often 9/16 wrench). Directly above and at the opposite end of the threaded portion on the "nut" there should be a very small hole. Gas is drawn into the larger bottom hole and then metered to the carb through the upper hole. It is very common for a bit of dirt or varnish to block the upper metered hole and this could be the culprit. Do you see any green buildup at the upper portion of the nut where the threads end? If so you have likely found the problem. To fix it first soak it with some carb cleaner or lacquer thinner, and then poke a small diameter soft wire back and forth through the hole a few times. For most applications the wire for a manila tag is nearly perfect. 3. Put it back together, turn the gas back on and give it 20 seconds or so and hopefully the blower will start right up. If not ..drop it off at Mark Richter's, Wolfeboro Power, or Greenlands.
This instruction also applies to the older engines that has a screw in the nut to adjust the mixture rather than a fixed (and usually too lean) jet. There will still be a lower pickup hole and an upper metering hole. You just need to take the adjustment needle out before running a tag wire through the upper hole, otherwise the operation is the same. To adjust the mixture, warm up the engine for a couple of minutes and then set it at full throttle. Start with the adjustment needle 2.5 turns out and slowly turn it in until the engine is running at it maximum, and then back it out until you just begin to hear a bit of an rpm drop. This should give you you best power and response.
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