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  1. #1
    Member
    Join Date
    Sep 2019
    Location
    Farmington/NY
    Posts
    10

    Suzuki DT115 issues

    I've got an older dt115. I believe it's a 1981. The motor seams to run good cold. When it warms up, I think I'm losing a cylinder. Compression on all 4 are decent. When I pulled the plugs one of them had a brown deposit on the insulator. These are new plugs with less than an hour on them. Other than that, none were wet or oily. Any ideas? Motor sounds good, it just acts like I'm pulling back on the throttle.

  2. Member
    Join Date
    Aug 2012
    Location
    London UK
    Posts
    883
    #2
    Swap the brown plug with one of the other plugs and give it a run, just to see whether it's the plug or the supply going to it. Then check the ignition system back if the plugs prove OK.

  3. Member
    Join Date
    Apr 2012
    Location
    Insomnia, near Seaford Delaware
    Posts
    35,513
    #3
    Not too familiar with that motor, but if you have 4 carburetors I'd take that one off and clean it. If you only have 2 carbs, that probably isn't the issue.
    You might find the reed plates for that cylinder and check them.