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Chainsaw Sparks with spark arrestor

Post in 'The Gear' started by 04HemiRam2500, Oct 8, 2013.

  1. 04HemiRam2500

    04HemiRam2500 Feeling the Heat

    Joined:
    Jul 10, 2013
    Messages:
    415
    Loc:
    SW PA
    I got a 1970 Power Mac 6 runs great but when I bought it it was missing the spark arrestor screen. I took a screen that was large from an old craftsmen that I use for parts. I cut it to fit the shape of the Mac muffler. However, I wen to cut today and sparks were coming out. I did notice that sparks were coming when the saw was at full rpm with no load on it. When it had a load in the wood I looked multiple times and did not see a spark.

    Is my cut job not good enough I did my best to make it fit the size of the muffler. Will the screen need cleaned already. Also, is it possible that I may need to tune the high setting on the carb?

    Thanks all.

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  2. Jags

    Jags Moderate Moderator Staff Member

    Joined:
    Aug 2, 2006
    Messages:
    13,994
    Loc:
    Northern IL
    Hmmm...interesting. Is the screen glowing when it is spitting sparks? Could you be running hot (lean)? Is the current screen "peeling" in any way? Try a fine wire brush on the screen, that may help.
  3. 04HemiRam2500

    04HemiRam2500 Feeling the Heat

    Joined:
    Jul 10, 2013
    Messages:
    415
    Loc:
    SW PA
    Well, I did cut the spark arrestor screen myself so the edges are roughly cut and in spots there are threads being split. However, this is just on the ends and I made sure that the spark arrestor covers the entire muffler and it is a tight fit.

    I am thinking that the carb may be set to high hence when I run it at full rpm without load extra fuel and oil (most importantly) are getting into the muffler thus sparks. This would also explain that when a load is on it it stops sparking.

    Let me know what you think!
  4. Jags

    Jags Moderate Moderator Staff Member

    Joined:
    Aug 2, 2006
    Messages:
    13,994
    Loc:
    Northern IL
    It could be that at no load your RPM is just high enough to cause a lean condition and extra exhaust. How hard is it to pull the spark arrestor back out? You would be able to fine tune a "cause and effect" from that.

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