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  1. #1
    Veteran Member Jay4200's Avatar
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    Hudson/Weare, NH
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    L4200GST w/ LA680 & BX2200D w/ LA211

    Default Shower of sparks from exhaust

    I was clearing snow Friday night in the dark, and was pushing my kubota L4200 pretty good. There was about 10" of heavy stuff, I was WFO at PTO speed or slightly better, probably a gear higher than I should've been, and going uphill. As I finished my ~400' hill, I noticed sparks coming out of my exhaust. Not like a couple here and there, but a crapload - like somebody was running a grinder in the engine compartment. I stopped working and slowed the engine down - after a minute or so the sparks stopped coming out. The engine sounded fine the whole time, and everything else seemed OK, so I continued on, although I took it a little easier. No more sparks came out after that. I'm hoping I was just burning carbon out of the exhaust can.

    Does any of this sound unusual? I've never really run at night before, so maybe sparks come out frequently and I just never saw it before?

    JayC

  2. #2
    Veteran Member
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    Ontario
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    CT235

    Default Re: Shower of sparks from exhaust

    You may have ignited some of the packing in the muffler.
    Tim.

  3. #3
    Veteran Member vtsnowedin's Avatar
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    Default Re: Shower of sparks from exhaust

    I've seen that before at night when working the bejesus out of a tractor. All the carbon that built up on the exhaust valves and in the exhaust manifold when it was idling or doing half throttle work falls off when the metal it is stuck on gets red hot at full load. As long as your oil pressure and coolant temps are in line I don't think you have much to worry about and it may even run better after a good cleaning out.

  4. #4
    Elite Member Don87's Avatar
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    May 2010
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    4,226
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    SW Pa.
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    Massey Ferguson GC2400

    Default Re: Shower of sparks from exhaust

    My dealer claims it's carbon buid-up in the muffler from running at too low of rpm's for too long of a time. He said to be sure to go to WOT occasionally to keep it clear(like what you experienced).

    When I was having issues with mine, that was the first thing he checked, but mine was clean.
    Don

    MF GC2400, FEL, 60in.MMM, 5ft. Cultivator, Single Bottom Plow, Bush Hog RTC48 tiller, MF 2360 front mount snowblower, 5ft backblade. BXpanded Piranha toothbar.

  5. #5
    Silver Member
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    Jan 2012
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    153
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    Cub 7274

    Default Re: Shower of sparks from exhaust

    Some of the old GM locomotives we used to use would light up the sky at night with exhaust showers even causing the odd grass fire along the right of way in the dryness of the summer and it was because of carbon build up.
    You didnt want to be anywhere but in the cab when it was real bad as you would be covered in soot

  6. #6
    Veteran Member Jay4200's Avatar
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    Hudson/Weare, NH
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    L4200GST w/ LA680 & BX2200D w/ LA211

    Default Re: Shower of sparks from exhaust

    Thanks all. Oddly, I pretty much always run at WFO - at least in the winter while running my snowblower. I guess that creampuff engine I have is still loafing when I'm thinking I'm working it. I guess I need to beat on it even harder...I can't wait.

  7. #7
    Super Member Gary Fowler's Avatar
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    Bismarck Arkansas
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    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: Shower of sparks from exhaust

    I have ran big farm tractors (100+ HP) at night pulling heavy loads and the muffler will be glowing red with sparks blowing out occasionally. Nothing to worry about. Engine loafing around builds up carbon and normally muffler doesn't run that hot till you load the engine and then it heats up and will burn out the carbon build up. Even running WOT (wide open throttle) without a load doesn't heat up the exhaust, it has to be loaded also.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  8. #8
    Super Member Gary Fowler's Avatar
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    Bismarck Arkansas
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    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: Shower of sparks from exhaust

    Quote Originally Posted by Jay4200 View Post
    Thanks all. Oddly, I pretty much always run at WFO - at least in the winter while running my snowblower. I guess that creampuff engine I have is still loafing when I'm thinking I'm working it. I guess I need to beat on it even harder...I can't wait.
    I have been trying to think what WFO stands for and cant. Please enlighten me
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  9. #9
    Super Star Member
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    Northern Fingerlakes region of NY, USA
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    Kubota L3830GST, B7500HST, BX2660

    Default Re: Shower of sparks from exhaust

    Quote Originally Posted by Gary Fowler View Post
    I have been trying to think what WFO stands for and cant. Please enlighten me
    Wide _____ Open

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

  10. #10
    Platinum Member saracenas's Avatar
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    Present: 2003 Kubota M9000 DTF. Sold: 1985 Kubota L2202

    Default Re: Shower of sparks from exhaust

    In my opinion it's not only the carbon from exhaust system which could produce a spark stream. I mean carbon should be ignited by something to make that effect. And that "something" could be fuel. Because at high RPMs and loads here comes a huge enrichment of air/fuel mixture so that not all fuel is being burnt in the cylinders. Part of fuel gets out still burning but inside the exhaust system components and outside. It also ignites internal carbon and its particles. That's why sometimes we may see sparks coming out of exhaust.
    Once at the beginning of '80s when I was driving trucks I've got even a fire running out of 10 tons dump truck platform which was heated by exhaust gases. A fire stopped immediately after deceleration. The double bottom of a platform was full of unburnt diesel fuel.

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