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High idle hunting and back firing on FrankenDeere snowblower

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  • High idle hunting and back firing on FrankenDeere snowblower

    Years ago I replaced the Tecumseh 5 hp Sno King engine on my snowblower with an 8 hp Tecumseh. It took some work to get the governor and linkage to maintain power and high idle under load.

    Problem is when I'm at no-load high idle the engine starts to hunt and surge, backfiring between surges.

    Any suggestions to maintain a constant high idle speed?
    '96 Larson 174 SEI BR. 4.3LX 4 bbl Weber s/n 0F786604. Alpha One Gen II s/n 0F709315


  • #2
    Just went through the same exact issue.On the side of the carb there should be a air jet needle that you can screw out and clean.I said the heck with that and ordered a new carb from amazon for less than 20 dollars cnd.Problem solved .For approx. 13 or so American dollars why even fool around with an old carb?Mine was a 2005 8hp Tecumseh.Carb is iztor carb .Get your model number for the motor and go from there.

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    • #3
      ^^^ agreed. Hunting is usually a fuel related problem and the quickest fix may be a new carb.

      FWIW - I had an Ariens with the 8 hp flathead Tecumseh engine (318cc) with similar issues and a carb replacement ( adjustable style carb ) fixed it for the most part, but the engine would still hunt a bit at high idle, especially when cold.

      It was OK since the normal operation is either at/near full throttle or at low idle - both of which were fine.
      Best regards, Ted . . . . Cape Cod, MA

      Current Boats: Formula 330 Sun Sport, O'Day Mariner Sail #3224, Sunfish
      Past Boats: Catalina 22 Sail #10531, Formula 242 Sun Sport
      Twin Mercruiser 7.4 LX MPI (0F802036, 039), Bravo 3's (0F806198, 199), Mercury 7.5 HP (1969), Johnson 4.5 HP (1980)

      My Boating Web Pages: http://www.tpenfield.com

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      • #4
        The air jet in my snow blower is a plastic non adjustable, unfortunately it is not the right size for the altitude I live at, I have read that a bunch of guys with the same blower I have, have had to drill the plastic air jet to get them to stop surging. When I am blowing snow it runs smooth, but at idle it hunts and has since the day I purchased it 5 years ago.

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        • #5
          update?

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          • #6
            Dirty carb (running lean)
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

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            • #7
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              Originally posted by 82rude View Post
              update?
              I've got your Iztor info penciled down. I switched over to R&R the starter in my 20 yr old Durango. And that's been a barrel of laughs. Had to grind off two rusted cross member bolts to gain access. Now can't budge the top starter retaining cap screw.

              I'll either turn it over to a shop, assuming I can click the solenoid enough for one last start. If not, I'll have to add a tow to the tab. My 600 ft/lb air impact gun won't touch the bolt. For $200 min shop charge + a possible tow, I'm shopping for a beefier impact gun that will squeeze over the frame for <= $200. MAP gas on a propane torch didn't help. I've got a mini map/oxy torch that gets plenty hot. Pretty sure the shop will use a oxy/acetylene rosebud.
              '96 Larson 174 SEI BR. 4.3LX 4 bbl Weber s/n 0F786604. Alpha One Gen II s/n 0F709315

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