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Thread: Hot engine

  1. #1
    Junior Member twran's Avatar
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    Hot engine

    How hot does everyones engine get?
    I just got mine back today from the shop.
    Just want to know if it's running to hot seams like it always has.
    2015 TW200
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  2. #2
    Senior Member Fred's Avatar
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    "Hot" is such a subjective term it is hard to respond.
    A lean carb can make your TW run lean. Changing the mixture screw from a stock lean setting to a richer position is very common here.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
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  3. #3
    Junior Member twran's Avatar
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    Is that with a jet kit?
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  5. #4
    Senior Member Fred's Avatar
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    Sorry, I should have explained. The mixture screw is a tapered needle that comes from the factory usually only about 1.75 revolutions out from fully seated. As the needle is unscrewed then more gas is added to the fuel mix throughout the RPM range. We typically have the mixture screw needle about 2.25 to 2.5 revolutions out from fully seated. This is a good first step for most bikes operated at sea level before any jetting changes are recommended .The mixture screw hides beneath a little plug on the underside of the carb on the intake side.

    Called the "PILOT MIXTURE SCREW" in the above video it appears at the 30 second mark.
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    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  6. #5
    Senior Member Fred's Avatar
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    That is a simple little cartoon good for demonstrating overal VC carb operation. You can see that the mixture screw adjusts how much of the fuel that goes through the pilot jet is allowed to be pulled by vacuum into the engine.
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    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  7. #6
    Senior Member RockyTFS's Avatar
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    Quote Originally Posted by twran View Post
    Is that with a jet kit?
    Undo the clamps on the carb fairly loose, rotate the carb clockwise until the throttle cables stop it. Then get a 1/16 inch drill and carefully (don't go in very far) make a hole in the pot metal plug for the pilot needle. Insert a drywall screw and pop the plug out. Now bottom out the mixture screw gently and count out 2.5 turns for sea level, 2 turns for 5,000 feet or higher.
    Turn the carb back and tighten the clamps. See if you notice it runs any cooler.

    Most sea level riders in hot climates change the main jet to a 128 or a 130. However, I've had my 2010 TW in Death Valley in temps up to 90 and haven't noticed that it got too hot. Climbing long steep hills in first at 90 or above is the hottest environment you can subject the bike too, also stop and go traffic at the same temps.....not enough airflow. I didn't do either of those in DV. YMMV
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    Rocky
    2018 TW200
    2014 BMW R1200GS LC

  8. #7
    Senior Member Badgerflorida's Avatar
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    +1 on the mixture screw adjustment. Mine was set at 2.5 turns when it checked it. But the process of turning it all the way in and then back out 2.5 turns must have dislodged some crud because my bike started and ran much better after.

    I’ve never gotten an accurate heat measurement from mine. I believe I saw on here someone installed an oil filler hole cap with a temp gauge built in.
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  9. #8
    Senior Member grewen's Avatar
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    i think, first of all, what makes you think it is too hot? pipe glowing red, motor slowing down??
    Greg

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