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Bike getting too cold on extremely long downhills? 2020 300 EXC

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  • Bike getting too cold on extremely long downhills? 2020 300 EXC

    Hi guys,

    Has anyone had issues with long downhills and the bike running cold? I have a 2020 300 exc and did a trip yesterday to the Vic high country. I let the bike warm up to 60*C before taking off but there were several long downhills where once I got to the bottom, the bike ran like it was cold. My radiator fan temp gauge read 25-35*C on these occasions so I sat at the bottom of the hill and warmed the bike up again. Ambient temp was 8-14*C.

    My main concern is cold seizing it. My Yz250 used to get a bit cold at the bottom of long hills but never had a temp gauge to compare it.

    Once warm again, the bike ran superb and had no issues with altitude changes.

    Thanks for any input.

  • #2
    Maybe try some throttle blips on the way down? I do that on my carb'd 300 to keep it cleaned up as I'm doing longer decents. For your TPI it might help keep some heat in the coolant. Also I'm guessing once the bike is fully heat soaked it probably won't have such an issue. Doing a long decent close to taking off your engine case and components are still probably pulling heat away from the cylinder and now you're rolling down a long hill without throttle.. everything is drawing the heat out of the coolant a once.
    '17 KTM 300 XC-W- Current
    '09 KTM 300 XC-W - Sold
    '14 KTM 350 EXC-F - Sold
    '05 KTM 525 EXC - Sold

    >> My YouTube Channel <<

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    • #3
      Thanks for the post/thread NineLives.
      Thermostat's aid-in warming-engines.
      They don't/can't stop any overheating.
      I'd check &/or replace the Thermostat.
      The More I Learn... The Less I Know.
      That Which Doesn't Change... Stays The Same.
      Those That Don't Fall... Just Aren't Trying Hard Enough.
      Genius or Idiot... Sadly it's Defined by the Mediocre Masses... With their Hindsight.
      Dicklaimer... The Text above is to be Evaluated by a Responsible Person... Prior to Any Action Being Taken.

      *George Carlin*What We Do*No Bravery*Tell the Truth*911*Genetic Armageddon*Carbon Tax*Interplanetary Climate Change*Fracking*Shock Doctrine*Extinction Protocol*

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      • #4
        Thanks for the responses guys. Coming off a Yz250, I didn't realise these bikes run thermostats!! That would explain half of my problem.. The temp sensor for the fan digital readout is a copper insert into the radiator fins so I'm reading the temp after the thermostat. I'll check the thermostat and make sure it's working correctly/hasnt been removed by the previous owner.

        Ktmjono, I do occasionally blip the throttle as an old habit from running the carbs to spray some oil in the cylinder. I think you're right. Once the bike is heatsoaked as long as the thermostat is operating correctly, I should be right.

        As to why it runs like it's cold.. I'm thinking maybe the ambient air pressure sensor is crook? It could be an altitude thing, but it would make sense that the bike would run leaner at the bottom of the hill and not feel like it's rich!/cold. Nevertheless, I'll start with checking the thermostat.

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        • #5
          Yes they have a thermostat, even the carbed KTM's do. Very rare for them to fail, but some ppl do remove them in an attempt to make them run cooler, while claiming to have removed a failure point.. I'm not so sold on that theory myself. If your sensor is on the rads that would be giving you a false reading in this situation for sure. Just speculating, but if it cools enough to close the thermostat, I wonder if the F.I does go into rich fuelling to compensate? Not too sure.
          '17 KTM 300 XC-W- Current
          '09 KTM 300 XC-W - Sold
          '14 KTM 350 EXC-F - Sold
          '05 KTM 525 EXC - Sold

          >> My YouTube Channel <<

          Comment


          • #6
            If you have a look/fiddle; you may see if it's stuck open. Be sure to avoid air-locks in the hoses: A hint; air rises.
            The More I Learn... The Less I Know.
            That Which Doesn't Change... Stays The Same.
            Those That Don't Fall... Just Aren't Trying Hard Enough.
            Genius or Idiot... Sadly it's Defined by the Mediocre Masses... With their Hindsight.
            Dicklaimer... The Text above is to be Evaluated by a Responsible Person... Prior to Any Action Being Taken.

            *George Carlin*What We Do*No Bravery*Tell the Truth*911*Genetic Armageddon*Carbon Tax*Interplanetary Climate Change*Fracking*Shock Doctrine*Extinction Protocol*

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            • #7
              Sounds possibly like the 3ngine management isn't handling the altitude change. Did you try turning off the engine at the bottom and back on again. Kind of like a reset switch. This had to be done on the '19 model in some cases.

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              • #8
                Originally posted by KtmJono_777 View Post
                Just speculating, but if it cools enough to close the thermostat, I wonder if the F.I does go into rich fuelling to compensate? Not too sure.
                Yes I think it's definitely possible. The bike feels the same as when i try to take off when not warmed up correctly. There's a lot of talk about cold seizures on these bikes and emphasense is placed on proper warm up procedure hence I would like to get on top of this.

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                • #9
                  Originally posted by Pete40 View Post
                  Sounds possibly like the 3ngine management isn't handling the altitude change. Did you try turning off the engine at the bottom and back on again. Kind of like a reset switch. This had to be done on the '19 model in some cases.
                  Yeah the bike died a few times at the bottom of the hill due to poor idle and upon restart the cold running condition was still there. It wasn't until I warmed it up that it ran perfectly again. I'm not sure if the 20/21's rely solely on the ambient air pressure sensor or look at the crank case pressure sensor (when the engine is off) aswell to get the atmospheric pressure. It would be a good diagnostic tool to compare both sensors while the bike is off to check for discrepancy.

                  I've got a few things to try now, so will have a play over the next few weeks and report back. Still very new to ktm and TPI but absolutely loving it. I'll never get rid of the Yz250 but the Kato has become my main weapon!
                  ​​​

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