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    Fresh Rebuild - Black Grit in oil

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    • liquid-snake
      liquid-snake last edited by

      Greetings all,

      I've just competed the first startup on my freshly (full) rebuilt engine (DT125R '02). A major oil leak was noted by the sprocket drive so I drained the oil and replaced the seal. When the oil was drained I noticed a pretty substantial amount of fine black grit. The oil used was castrol and is pink/red in colour (definitely 4T oil) so these flecks of black stand out quite clearly.

      I've inspected some of the larger pieces which are still quite fine, they are hard and some a little sharp. Its almost like paint flecks? Sorry its difficult to describe. Certainly nothing that looks like metal so far or at least nothing silver in colour has appeared. I will try and get a photo for this.

      I very much hope this wont be cause for another teardown, here's some additional detail about this engine:

      2003 unit, supposedly 16k on it. Total rebuild top and bottom. Bike was run with no filter on the carb and no coolant. Engine started on 2nd kick and stayed running on full choke for approx 2 mins

      declan 1 Reply Last reply Reply Quote 0
      • declan
        declan @liquid-snake last edited by

        @liquid-snake how thoroughly did you clean the inside of the cases

        liquid-snake 1 Reply Last reply Reply Quote 0
        • O
          oldman last edited by

          definitely 4T oil?
          Do you mean 2 stroke oil?

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          • liquid-snake
            liquid-snake @declan last edited by

            @declan I'd like to think pretty good, but you've cast doubt in mind! I think and hope you're onto something there. Fingers crossed with a few flushes we'll be clear

            @oldman 750mls of 4T 10/30 for transmission. I picked up castrol for 2T also which is the usual crimson red but I was surprised to see this 10/300 stuff as pinkish-red too. First time I've seen anything besides the usual golden brown (texture like sun...) engine oil

            declan 1 Reply Last reply Reply Quote 0
            • declan
              declan @liquid-snake last edited by

              @liquid-snake just saying because ive had simmilar things come out of the inside of engines

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              • Calum
                Calum last edited by

                What sort of castrol? It could be messing with the clutch plates breaking them down. Could be clutch you are seeing.

                Always Originate, Never Pirate!

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                • S
                  SpookDog last edited by

                  What sealant did you use on the cases?
                  Also how well were they cleaned, the gears, clutch, bearings, ect, ect...
                  Could of been some old crud washed out by the new oil...

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                  • S
                    SpookDog last edited by

                    Isn’t 4T 4stroke ‘racing’ oil? Just cause it sez 10w/30 doesn’t mean that it’s gear oil. Engine oil is different.
                    Gear oil used to be EP90 in my day, it’s so fekin confusing now...

                    Calum 1 Reply Last reply Reply Quote 0
                    • Calum
                      Calum @SpookDog last edited by

                      @SpookDog I have only ever ran 4T engine oil in my DTR.

                      Always Originate, Never Pirate!

                      declan 1 Reply Last reply Reply Quote 0
                      • declan
                        declan @Calum last edited by declan

                        @Calum same I've always had 4 strokes so I just have one oil for all

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                        • Calum
                          Calum last edited by

                          I should clarify, 4T oil in the transmission fluid.

                          Gear oil in the Aprilia though 😃

                          Always Originate, Never Pirate!

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