Yamaha DT100E 1978

Discussion in 'Vintage Bikes / Racing Forum' started by gtdragon980, Jul 22, 2007.



  1. gtdragon980

    gtdragon980 Rookie DRN Member

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    hey i have a dt100e and its just been sitting in my backyard for two years rusting and just slowly deteriorating so i decided to fix it up and get it working, but my problem is that the front brake is stuck from sitting there through winter and my front wheel just wont budge. i dont know how to get my front brake to release. the lines and rusted up so i sprayed some wd-40 in them and it still didnt do anything. ive tried some forums and havent gotten any respone so i hope someone can help me in this one. thanks!


  2. _JOE_

    _JOE_ Subscriber

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    The shoes are probly rusted to the drum.
  3. 2 strokes for life

    2 strokes for life Rookie DRN Member

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    gtdragon980, you have to take them old shoes out and replace them.
  4. gtdragon980

    gtdragon980 Rookie DRN Member

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    where would i be able to get the shoes from for this bike?
  5. _JOE_

    _JOE_ Subscriber

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    A motorcyle parts dealer.
  6. gtdragon980

    gtdragon980 Rookie DRN Member

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    alright well i fixed the brake problem but im having trouble starting it. i think the fuel isnt coming through or something but i tried to push start it and when i kick it in gear id give full throttle but nothing it would sound like its on but it wouldnt move and then when it stops rolling it would cut off. im going to take the carb out and check it but im not sure if something is wrong with my gas tank.
  7. 2 strokes for life

    2 strokes for life Rookie DRN Member

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  8. CRazy250

    CRazy250 Rookie DRN Member

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    with a bike that old you NEED to clean your carb and i can bet you need new piston and rings. thats JUST a start.
  9. gtdragon980

    gtdragon980 Rookie DRN Member

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    well i did what 2 strokes for life said and i cleaned every thing including the carb. but it still wont start, it only has like 211 miles on it so i doubt it should need too much work. i had started it like a year ago and it would idle but when it came to driving, id put it in gear and give some gas and it would try to go and then stall. so i dont know why it doesnt start now?
  10. Skookill

    Skookill Rookie DRN Member

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    Pull the carb and clean out the jets and every nook and cranny. The old gas has to have everything gummed up by now. Thats also why you could start it and idle, but not go with gas... clogged jets. Sounds like some major crud in the carb/jets.
  11. 2 strokes for life

    2 strokes for life Rookie DRN Member

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    Skookill, i am with you. Also, check and clean the airfilter, and put in a new spark plug and fresh gas and fresh pre mix oil in the oil injector tank.
  12. Skookill

    Skookill Rookie DRN Member

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    Take the new plug and touch it to the engine block, kick the bike over and see if you get spark at the tip of the plug. This way you'll know if its electrical or fuel related.
  13. flyingfuzzball

    flyingfuzzball Rookie DRN Member

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    is the spark weak?

    my friend had a similar prob and it was a weak spark. when bumping it it starts to start but it cant?
  14. DougRoost

    DougRoost Subscriber

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    Good point on spark (no pun intended). My first bike was a '76 DT100 and they still had breaker point ignitions (the 250 and 400 had CDI).
  15. gtdragon980

    gtdragon980 Rookie DRN Member

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    i think it might be electrical then because its not sparking.
  16. gtdragon980

    gtdragon980 Rookie DRN Member

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    the batt has nothing to do with it though right?
  17. gtdragon980

    gtdragon980 Rookie DRN Member

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  18. zoommx

    zoommx Subscriber

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    I'm almost certain the battery has no affect on spark. I used to have an old XL honda and the thing would run fine without a battery at all.
    If it still has points/condenser, the condenser is likely bad. Points may be cleanable and o.k. Points and condenser set should be pretty cheap....less than $25 I'm thinkin.
  19. gtdragon980

    gtdragon980 Rookie DRN Member

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    lol ok just to let you guys know, im a reallll newbie so i only know soo much, i dont know anything about electrical so about the points/condenser, where is that on the bike?
  20. zoommx

    zoommx Subscriber

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    ooops, just looked your bike parts up on yamaha-motor.com. It has an electronic ignition, no points/condenser. In the service data, page 1 it does have resistance values for the coils if you have a good multimeter.
    Check to make sure your shutoff isn't shorted either. Trace the wires from the switch to the coil and you should be able to simply unplug it/them there to test.



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