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Thread: Loss of power

  1. #1
    Member RTCarroll84's Avatar
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    Just picked up a 1987 TW200 and it has a big issue with loss of power. When i start up it might take a minute to 5 minutes but it will begin to idle oddly. I can make it happen if i open the throttle past 1/2 to 3/4 open. it will sputter and will not respond to the throttle. It's more like a high idle that keeps getting grounded out. the head light will go from bright to dim and back again as well. I have cleaned the carb 2 times now, inspected the pilot and main jets, cleaned every hole through out it. i don't think it would be an electrical issue since it is so intermittent but who knows at this point. When it losses power, it really goes dead... it's quicker to walk it around than engage the clutch. Sometimes it will regain power if i let it sit it seems or if i push through it on WOT for 15 mins. Another issue that may and or not be related (goes back to electrical) is the fact that when i turn the key to on the only lights that turn on are the tail light and neutral light (the headlight and speedo light don't come on till i start the bike, which is odd since it's a new battery) If any one has any ideas... i'm all ears. PLEASE PLEASE PLEASE help me out! Thanks!

  2. #2
    Senior Member Rainman's Avatar
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    Can't help you with your problem, but I can tell you that when you turn your key on, only the tail light and neutral light should come on. Thats normal for a 1987. If you had a newer bike, all the lights would come on.
    If you can't find it, grind it

    1990 TW200

  3. #3
    Member RTCarroll84's Avatar
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    just tried to adjust the air fuel ratio w no such luck. this is really killing me. i've never seen anything like this after 2 complete through carb cleanings. spark plug looks good, engine sometimes runs perfectly, and then nothing. i can't believe this. i'm seriously trying to search my head for solutions. ANY ideas are very appreciated as i'm at the end of my rope.

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  5. #4
    Member RTCarroll84's Avatar
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    Thank you for the fast reply. and i wasn't sure about the lights since the wiring diagrams indicated they should be on. but i'm glad thats at least ok.

  6. #5
    Senior Member uktw125's Avatar
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    Sounds fuel starvation to me. Have you got a good, steady flow of fuel out of the petrol tap. It maybe partially blocked.

    Check your float height also.

    And your tank breather in the cap, maybe creating a vacuum in the tank as fuel is used.

  7. #6
    Member RTCarroll84's Avatar
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    tried running without the cap before, still the same. i actually checked that fuel was flowing in the carb, in the line, wired each jet, took the petcock apart... it all seems to flow fine. i am just giving in and bringing it to a friend who owns a shop. he only does older bikes (mostly dirt bikes) from the 70's and 80's... so i'll let everyone on here know what in the world it was hopefully. i haven't taken a bike to the shop in years.... and i'll probably kick myself when i get it back.

  8. #7
    Senior Member uktw125's Avatar
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    OK, let us know the reason when you have it fixed. It helps everyone with problems in the future.

  9. #8
    Junior Member jfnugent's Avatar
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    yes please do post back. I have the same symptoms at the end of the season. Never dies just looses power goes to about half power. symptoms were were the same as you described. Thanks Jim

  10. #9
    Member RTCarroll84's Avatar
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    Well as of right now, my friend thats looking at in his shop is still leaning towards carb. We threw some ideas back and forth yesterday and we're going to play with the needle some. It seems very lean so he's going to move the e-clip down to the bottom and see how it runs. if it runs well, we're trying a new needle. If not he's swapping a carb from an XT 225 on to see if the problem persists. if it does then he's thinking the CDI.

  11. #10
    Banned qwerty's Avatar
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    Intermittant problems as you describe are usually electrical, unless there are chunks of crud floating around the fuel system.




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