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  1. #1
    Elite Member BobRip's Avatar
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    Powhatan Va.
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    2000 Power Trac 422

    Default Robin Subaru Engine Problems With Solutions

    We have had complaints about problems with the Robin Subaru engines.
    I would like this to be a thread that someone could use to quickly find a solution to an engine problem. Let's try to keep this to solutions that you are sure of and have personally tested. Here is the example format.

    Problem #: 1

    Problem: Engine runs on one cylinder, runs rough at all speeds and stalls when idled.

    Safety Concerns: The spark on the ignition coil can give you a nasty shock. Handle with care.

    Test: Run engine at medium speed. Pull one plug wire and see if engine stops. If it keeps running put that wire back and pull the other plug wire. If it stops there is a problem with the ignition on that side. Test for a spark by putting a screwdrive in the spark plug wire cap. Hold a portion of the screwdriver near a ground, crank the engine. If there is no spark then the ignition coil or wire is bad or the magnets are dirty. If there is a spark then check the spark plug.

    Solution: I found a bad ignition coil. It was originally erratic but then failed completely.
    Bob Rip
    Tell me and I will hear.
    Show me and I will see.
    Let me do and I will learn.
    Let me fail and I will understand.

  2. #2
    Elite Member BobRip's Avatar
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    Default Re: Robin Subaru Engine Problems With Solutions

    Problem #: 2

    Problem: Engine does not start when cold. It cranks normally.

    Safety Concerns: Normal care about rotating parts. Wear safety glasses.

    Test: Crank engine with choke on. If it does not start remove air cleaner and verify that the choke is closed. Manually try to close choke if needed at carburetor. (The choke is closed with a spring and may erratically stick open). If it starts then this is the problem.

    Solution: Try cleaning the choke assembly with carburetor cleaner. If this does not work do this.

    Close choke and remove the screws that hold the coke plate to the choke shaft. (Be very careful not to drop the screws in the carb. You might want to put a piece of tape on the choke plate hole) Observe how the choke spring is installed. Remove the choke plate and pull the choke shaft out. Clean the shaft, choke plate, and holes that the shaft when through and reassemble. This problem was erratic and once I manually closed the choke it would be OK for awhile. The next monring it would not close.
    Bob Rip
    Tell me and I will hear.
    Show me and I will see.
    Let me do and I will learn.
    Let me fail and I will understand.

  3. #3
    Elite Member BobRip's Avatar
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    2000 Power Trac 422

    Default Re: Robin Subaru Engine Problems With Solutions

    Quote Originally Posted by BobRip View Post
    We have had complaints about problems with the Robin Subaru engines.
    I would like this to be a thread that someone could use to quickly find a solution to an engine problem. Let's try to keep this to solutions that you are sure of and have personally tested. Here is the example format.

    Problem #: 1

    Problem: Engine runs on one cylinder, runs rough at all speeds and stalls when idled.

    Safety Concerns: The spark on the ignition coil can give you a nasty shock. Handle with care.

    Test: Run engine at medium speed. Pull one plug wire and see if engine stops. If it keeps running put that wire back and pull the other plug wire. If it stops there is a problem with the ignition on that side. Test for a spark by putting a screwdrive in the spark plug wire cap. Hold a portion of the screwdriver near a ground, crank the engine. If there is no spark then the ignition coil or wire is bad or the magnets are dirty. If there is a spark then check the spark plug.

    Solution: I found a bad ignition coil. It was originally erratic but then failed completely.

    I have an error in the above post. The corrected Test: section is below.

    Test: Run engine at medium speed. Pull one plug wire and see if engine stops. If it keeps running put that wire back and pull the other plug wire. If it runs there is a problem with the ignition on that side. Test for a spark by putting a screwdriver in the spark plug wire cap. Hold a portion of the screwdriver near a ground, crank the engine. If there is no spark then the ignition coil or wire is bad or the magnets are dirty. If there is a spark then check the spark plug.
    Bob Rip
    Tell me and I will hear.
    Show me and I will see.
    Let me do and I will learn.
    Let me fail and I will understand.

  4. #4
    Elite Member BobRip's Avatar
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    Default Re: Robin Subaru Engine Problems With Solutions

    I am hoping others will post issues here. If they think this is valuable. Maybe it's not.
    Bob Rip
    Tell me and I will hear.
    Show me and I will see.
    Let me do and I will learn.
    Let me fail and I will understand.

  5. #5
    Platinum Member westcliffe01's Avatar
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    May 2009
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    SE MI
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    Bobcat B200 TLB

    Default Re: Robin Subaru Engine Problems With Solutions

    If you pull a plug wire and it makes no difference, THAT is the defective side (it is not firing, hence pulling it makes no difference).

  6. #6
    Elite Member BobRip's Avatar
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    Default Re: Robin Subaru Engine Problems With Solutions

    Quote Originally Posted by westcliffe01 View Post
    If you pull a plug wire and it makes no difference, THAT is the defective side (it is not firing, hence pulling it makes no difference).
    That's right. Thanks for the clarification.
    Bob Rip
    Tell me and I will hear.
    Show me and I will see.
    Let me do and I will learn.
    Let me fail and I will understand.

  7. #7
    New Member JIMMY JAMES's Avatar
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    EASTON ,PA
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    KUBATO B7800

    Default Re: Robin Subaru Engine Problems With Solutions

    I have a robin subaru EX27 9 hp engine on a portable backhoe that can run from for the first 1hr to 45 mins and will just stop. I can get it started with one pull and it will run for another 5 mins to 30mins. It usaully doesn't happen for the first 45mins, but once it happens then it will keep happening the rest a of the day Any ideas on the problem.
    Last edited by JIMMY JAMES; 08-30-2010 at 04:44 PM. Reason: engine model
    KUBOTA B7800 FEL WITH REAR SNOWBLOWER
    HARBOR FREIGHT TOW BEHIND BACKHOE

  8. #8
    Elite Member woodlandfarms's Avatar
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    Jul 2006
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    Los Angeles / SW Washington
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    PowerTrac 1850

    Default Re: Robin Subaru Engine Problems With Solutions

    Vapor lock or gascap issue
    Power-Trac 1850, grapple, hoe, 90" mower, 72" box blade

  9. #9
    New Member JIMMY JAMES's Avatar
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    Sep 2009
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    Location
    EASTON ,PA
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    KUBATO B7800

    Default Re: Robin Subaru Engine Problems With Solutions

    Thanks for the reply. Definitly not gas cap had that problem on a generator once so I am on top of that issue. It still happens when the cap is loose and well vented. Is there any thing I can do for the vapor lock? I thought vapor lock only happen after you stop the engine
    KUBOTA B7800 FEL WITH REAR SNOWBLOWER
    HARBOR FREIGHT TOW BEHIND BACKHOE

  10. #10
    Platinum Member tmarks11's Avatar
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    May 2005
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    613
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    Port Orchard, WA
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    2005 Power Trac 422

    Default Re: Robin Subaru Engine Problems With Solutions

    The mechanical fuel pump is mounted on the cylinder head. Close proximity between it and the muffler can cause it to vapor lock. You can move the fuel pump anywhere you want (it is pulse driven off crankcase vacuum, not using a mechanical linkage).

    Also look at how the fuel hose is run. If you put some heat shielding around it (or just user thicker hose), it can partially solve tis problem.

    Big assumption here; I am describing the robin 22hp engine, not the 9 hp version.
    -----------------------------------------------------
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    2005 PT-422
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