Question about Craftsman 4 Cycle Blower/Vac

3 Answers

I have the same problem as gjmaag2, I removed the muffler and while there were some deposits on the exhaust port walls, nothing close to clogged. However, with the muffler, you can't see inside. All i can see is the inlet is clear, and the exhaust hole is clear. My compression is 105 PSI, good spark, fresh gas, wet plug, and clean air filter.

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  • john0132 Oct 03, 2010

    The advice I got from the first expert was to adjust my carb to increase air. I am not confident with this response since the carb has NEVER been adjusted or touched. I've seen carb screws back out from vibration, but never back in. In addition, the starting sequence calls for full throttle. How do you get MORE air into an engine?

    The blower experienced a blown head gasket while under warranty. That was repaired. Other than air filter and occassional spark plug cleaning, nothing has been done to the unit.

    Lately, it became harder to start. Now, it will start and run for a few seconds then die. This is after priming. After a few cycles of this, it won't start at all. I checked compression, 105 PSI. I checked spark with a gap tester. The spark easily jumped a 6 mm gap so that seems okay to me. The plug comes out wet so fuel would seem to be ruled out. As noted before, I pulled the muffler and saw nothing plugged, a few minor deposits was all. Also, I am on my second batch of fresh fuel, mixed 40:1 per the OEM's instructions.

    This thing should run????? Is 105 PSI too low? Could I have another blown head gasket? It's been a long time, but it seems like I had the same symptoms when the head gasket blew.

  • john0132 Oct 03, 2010

    His problem and mine were as follows; Units have compression, his 95 PSI, mine 105 PSI, strong spark (mine had a strong spark across a 6 mm gap), fresh gas (mine X 2 batches), wet plugs, and clean air filters.

    But it won't run. Mine will run for a second or two after priming. After five or six times of this, it won't even do that. Mine had a head gasket failure when it was about a year old, and was replaced under warranty. The first expert suggested that the carb. needs adjusting. My problem with that is that my carb has never been touched, so unless vibration backed something out, I can't see it. Further, the starting instructions call for wide open throttle, so again, I am having trouble with the lack of air theory.

    I am also wondering if the compression is within range? It also seems to me that the symptom I see now are the same as when the unit needed a new head gasket. However, the 105 PSI reading seems to prove otherwise?

  • john0132 Oct 03, 2010

    I didn't think you were right, but I'm big enough to admit that you were definitely on the right path. It turns out that there was supposed to be a plastic stop cap to limit the mixture adjustment. I could see where it HAD been. Guess the thing broke and fell off, leaving the mixture screw to do whatever it wanted.

    I readjusted the Idle (air?) screw to factory settings (4.5) turns, then took a shot in the dark and readjusted the mixture screw to three turns. Fired right up! Took closing the Idle one turn, and closing the mixture screw 1/2 turn to get it idling without stalling... Runs like a champ.

    Thanks

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Here is a link to a couple of my Tips:
www.fixya.com/support/r6081405-cleaning_small_engie_carburetor

The KEY to getting your machine running is the Den Tek Brush.

Jim

Posted on Oct 04, 2010

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Sorry i couldnt find the problem with gjmaag2. But based on your explanation i figure your unit does not accelerate as it should?
If this is the case: Mufflers usually are seen through and you think there is no blockage. But the inner walls which contain the actual filterings components might have been blocked. If it is affordable get a replacement for the muffler otherwise get an expert to open it up and do a service of the muffler.
Hope this solution has been helpful?

Posted on Oct 03, 2010

  • Rockme
    Rockme Oct 04, 2010

    Sorry i couldnt reply your comments earlier it was due to the time difference. Also i would love to say thank you for the continuos feed back.
    Please endeavour to rate the response provided.
    And please visit fixya again soon.

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If the plug is wet your fuel air mix is too rich. Increase the air in the mix and you should be fine. To increase the air adjust the screw on the side of the carb.

Posted on Oct 03, 2010

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  • Bob Korsu
    Bob Korsu Oct 04, 2010

    john0132,

    Two things to cosider, 1. yes engine vibration can cause the carb adjustment to be off,but while it's not highly probable that this is the cause, it is worth checking, and second, you mentioned that the head gasket needed replacement. This is not typical unless there is an underlying problem. I 45 years I needed to replace 1 head gasket and that was because a pooly milled head caused the gasket to fail. I removed the head, took it to an auto machinist and had the head milled to perfection. My total cost was about $100 and a couple of hours of my time.

  • Bob Korsu
    Bob Korsu Oct 04, 2010

    Another thought. If the plug is wet with water the problem is definately the Head.

  • Bob Korsu
    Bob Korsu Oct 16, 2010

    Have you resolved the issue?

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