Air cooled engine - shut off/ start up

Discussion in 'the CleAn Room' started by carpetcleaner, Jul 21, 2017.

By carpetcleaner on Jul 21, 2017 at 4:10 PM
  1. carpetcleaner
    carpetcleaner

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    I was talking to another cleaner today as I was finishing at a house today. He told me that I was starting up and shutting off my machine wrong.

    I start up without the vacuum hose connected, with the machine at low idle. I throttle up and connect the vacuum hose to the waste tank.

    I shut down in reverse of start up and bring the machine down to low idle for a bit before turning the engine off.

    He said that I should leave my machine at full throttle at all times. Start up and shut off without the vacuum hose connected, but never lower the throttle.

    Is one way better? Why?

Comments

Discussion in 'the CleAn Room' started by carpetcleaner, Jul 21, 2017.

    1. Nate The Great
      Nate The Great

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      I've always started up my machine on low idle with the hoses connected.. Let it warm up for a minute or 2, then full throttle it.. Shutting down is where I bring the idle down for about 4-5 minutes, disconnecting the hoses and wrapping up before turning it off..

      Whether it's right or wrong, fook if I know.. From the videos I'm seen, that's how I came to the conclusion..

      I did hear other guys say you shouldn't run an AirCooled motor at half throttle.. Either idle or full throttle.. Something to do about torque curve, strain on the engine and the cooling of the engine..
    2. Onfire_02_01
      Onfire_02_01

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      Never heard of doing that. If that were the case why have a throttle at all?
      SamIam likes this.
    3. carpetcleaner
      carpetcleaner

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      That's what I asked him. He didn't know.
    4. Desk Jockey
      Desk Jockey

      Pony Boy Curtis

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      On my mower has a big Kohler air cooled on it I start in on high and shut down after lowering the speed down to idle for a second.
      ronbeatty likes this.
    5. clean image
      clean image

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      My KOHLER has Factory sticker that say to shut down at mid throttle.

      According to KOHLER reps, suppose to run air cool full rpm for proper cooling
      sOOper hero and Desk Jockey like this.
    6. sOOper hero
      sOOper hero

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      start up at 1/2 throttle (1500-1800 rpm) with NO LOAD (meaning no vac hoses)

      start up at mid RPM gets the oil pumping/circulating faster is why it's better than low idle

      shut down;
      Pull hoses and idle down to 1500 or so ..run for a minute or two then shut down .
      I forget what the reason for the minute or two no load run time before shut down is for, but recall there is a valid reason for it

      air cooled motors shouldn't be run under load at low/mid RPM due to lack of cooling.
      They should be run at 80% to max RPM for most efficiency. cooling and longevity


      ..L.T.A.
      Jimmy L and Lee Stockwell like this.
    7. Andy
      Andy

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      Start at mid throttle with no load to make it easier on the starter. Does not matter after that when you hook the hoses up.
      When shutting down, slow to mid throttle, remove vac hose to prevent back spin on the motor and to prevent blowing a head gasket, throttle to idle for a minute shut off.
    8. Jim Williams
      Jim Williams

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      I never run my Kohler at full throttle My last engine lasted well over 10,000 hours.

      The Kohler reps just want you to run them hard so you'll have to buy a new engine every 3000 hours. And if you blow an engine under warranty, good luck getting them to replace it. They screwed me out of a lawn mower engine that was under warranty.
      ronbeatty likes this.
      Last edited: Jul 21, 2017
    9. Onfire_02_01
      Onfire_02_01

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      Warentys are only worth the paper they are printed on. No matter how closely they are followed you have always done something to void it.
      ronbeatty likes this.
    10. hogjowl
      hogjowl

      @

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      Never listen to anything a local cleaner tells you.
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    11. sOOper hero
      sOOper hero

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      10K with no major repairs??

      I had an old cast iron Kohler that went 6000 hours
      Had a Command Pro that went 4200 before sucking a valve

      never heard of any air cooled going 10K without rebuild though

      ..L.T.A.
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    12. Jim Williams
      Jim Williams

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      Yep. That baby fired up every day for 9 years. It probably should have been replaced about 2 years sooner because of a blown head gasket but she kept running.

      I should probably have the water pump rebuilt. It's been running 13 years with no rebuild. I have to be sure and put the water line from the tank on top of the engine when I shut it down or it will lose prime and it's a pain to get it primed again.
      jcooper likes this.
    13. jcooper
      jcooper

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      Darn, seems like he's making up for the rest of us!

      4200? I'll take it! That will get me another 2 years on my command pro, leaks a little oil, but I let that stop bothering me after finding out the cost of a new installed engine!
    14. Goomer
      Goomer

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      I can't think of one valid reason why any engine should be cold started on full throttle.
      Matt Wood, roro and Able 1 like this.
    15. Swani
      Swani

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      My mechanic at Interlink told me the same thing, but I can't bring myself to run a cold engine at full throttle.
      Matt Wood likes this.
    16. Matt Wood
      Matt Wood

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      My friend has a big pressure washer on a trailer with a briggs 2cylinder engine on it. It doesn't have a throttle control. He cranks it up and turns it off at full throttle. It's about 10years old and he's been non stop in his pressure washing business. He's actually had to rebuild the water pump twice on the same engine
    17. Larry Cobb
      Larry Cobb

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      Cold engine means cold oil.

      Enough said.
      Swani likes this.
    18. carpetcleaner
      carpetcleaner

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      I googled it. It is an on going debate in any industry that uses air cooled engines.

      Most of the engine manufacturers seem to recommend starting at 1/3 throttle with choke on. Turn choke off and slowly bring up to speed. For shutting down, remove load, slow to idle, turn off.

      As long as the engine is properly maintained, it most likely doesn't matter how it is started or stopped. There seem to be long lasting engines either way.
      Matt Wood likes this.
    19. GreenTechAgain
      GreenTechAgain

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      What I do (was told by mechanic where I bought machine).

      Start up.
      Low throttle, idle for a few minutes before any load.
      I pre-spray with engine at idle.
      Full throttle.
      Lube blower with vac inlet completely shut off. (First job)
      Attach vac hose.
      Full throttle during operation - engine has governer.

      Shut down.
      Disconnect vac hose.
      Run full throttle, no load for at least 5 minutes to dry blower.
      Lube blower with vac inlet completely shut off. (Last job)
      Idle for a minute or two and shut down.

      Yes, there is no such thing as a Kohler warranty. The new 27hp that I bought is still not installed on my Judson. Back at Kohler after rep asked, "was this hit by lightning"? Started having problems after about 2 hours of operation. Been over 2 months.

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