2003 GG 280 TXT

Discussion in 'Trials' started by Greebe, Apr 29, 2017.

  1. Greebe

    Greebe Been here awhile

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    Well, guys I just wanted to thank everyone for their help finding a bike so I could get started in trials. I have looked at a lot and almost bought a newer bike, but found this 2003 Gas Gas 280 TXT that is in pretty decent condition.

    My plan is to ride this bike and learn on it and then maybe buy a new bike at the end of the year. I figured if I get an older bike I will be less worried about dinging it up learning to ride trials and push myself harder then I might with a new bike that I would be worried about knocking off the new. :-)

    I am going to go though it pretty well. Change the oil, remove the carb and clean everything and rejet if needed, rebuilt the forks and maybe shock, change the spark plug, and anything else you guys might think would be good. I already changed the air filter, drained the old gas. Probably should look at changing the oil in the brakes and clutch as well.

    If you guys have any advice on things I should do or adjust I would appreciate the advice. In the mean time I am planning on things to set up for my own trials course on my farm. Yippee, I have a bike!

    GG280TXT-sm.jpg
    #1
  2. ADVCoop

    ADVCoop Long timer

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    I think I saw that posted on the trials bikes for sale on Facebook. Was it in Minneapolis? Congrats btw!
    #2
  3. laser17

    laser17 Long timer

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    Very solid bikes. Changing the fluids is a good idea. One thing about the bike is that the filter gets dirty fast. Keep it clean and it will run and run.
    #3
  4. Huzband

    Huzband Team Dirt

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    Congrats! Looks mighty good, but then I might be a little biased.
    #4
  5. Greebe

    Greebe Been here awhile

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    Thanks everyone. I replaced the gas and messed around with it a little. The clutch, despite being adjusted in more, seems like it does not want to fully disengage which makes shifting a little hard. Do I need to add oil to the hydro clutch somehow or make some other adjustment?

    Also I noticed after riding for about 20 minutes that a sound developed which was coming from the engine that almost sounds like a squeaky loose chain. Kind of concerns me. Two stroke bikes are new to me, do not even know if they have a cam chain. Is this thing messed up?Bearing? Ahhhh!!!!

    Also I am not sure if it is running right. Again I am used to four strokes and have never even been on a 2 stroke, so it might be fine and I am just not used to it. It has plenty of power, but when it idles it kind of putts and kind of sounds like it is missing. when you give it a little throttle it comes alive, but at the higher RPM's kind of sputters a little.

    Feeling a little disturbed, hope I didn't buy a bucket of junk.:fpalm
    #5
  6. lineaway

    lineaway Long timer

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    Remember when ordering parts it is better to say you have a 2001 txt since that is what it was based on. Too much confision otherwise.
    #6
  7. lineaway

    lineaway Long timer

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    Pull the clutch plates out. I bet the friction plates are coming apart.
    #7
  8. BEEF706

    BEEF706 King of the dumb dab

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    More and smarter guys than I will chime in but first don't worry about shifting, because mostly you won't. They are designed to be out of the way in a section which you will almost always do in a single gear, especially at first. There is no cam chain, there might be some main bearing noise, but you wont rev it very high most of the time, most trials bikes I have ridden are kind of poppy at idle, happiest in the low to mid range, and will sputter a bit at the top of the range. She Motobene's excellent jetting thread for descriptions and advise, noob to noob just ride it and get some peg time in, your face will be sore from smiling. Our club has a lot of bikes from that era (including mine) that are still going strong. PS Linaway knows of which he speaks I try to heed his advice
    #8
  9. Greebe

    Greebe Been here awhile

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    Thanks, I listened to some other 280 TXT on youtube and they sound more or less like mine the way the engine runs.

    Just went out to test it more, and it definitely sounds like a noisy bearing. Sounds like the ball bearings are just rolling around in the track loose. Gerrrr...... I wonder if I should not ride it, and fix the bearing. I hate to trash something else if the bearing fails. What do you guys think?
    #9
  10. 2whlrcr

    2whlrcr gooligan

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    Pull everthing apart on the chassis and wheels that have bearings and clean and regrease.
    #10
  11. 2whlrcr

    2whlrcr gooligan

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    It's probably fine and just a normal two stroke. But pretty hard to tell without hearing it. I can't remember if the clutch on those rattle as bad as the Pros. Pull the clutch lever in at idle...any quieter?
    #11
  12. heffergm

    heffergm Long timer

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    Two strokes have no cam, so you're pretty safe on the non existent cam chain. It's probably just clutch rattle, which is normal.
    #12
  13. Huzband

    Huzband Team Dirt

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    I'm betting the rattly sound is just the fan. It's not unusual for them to be a bit noisy, & the location of it can fool you into thinking it's the motor. Let it cool a bit, then start it and let it idle while you watch for the fan to come on. If the noise coincides, voila. But if the noise appears first, listen closely and try to narrow down the area of suspicion.

    2 stroke trials motors are unique in their characteristics. Loads of bottom end, good but short mid range, and absolutely zero top end. Matter of fact they fall on their face very quickly as you pass through the mid range. Don't try to wind it out, won't happen. It won't take you long to adapt to it though
    #13
  14. lineaway

    lineaway Long timer

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    Huzband, I thought you just bought a 2003 Pro. You obviously have not rev`d it yet.
    #14
  15. Greebe

    Greebe Been here awhile

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    Thanks guys. So the rattling was there even with the clutch pulled in. I went ahead and changed the oil though and it looked like chocolate milk. I changed it with some Maxima 75 Ultra thin, and the noise went away. Wonder if things were not getting lubed properly. Also the engine seems to be clearing up the more I ride it with fresh gas. I put about 2 hours on it this afternoon.

    This is really a fun bike. Seems like I am getting it squared away. Still might pull the clutch cover and check the condition of the clutch. I am also glad I did not get anything smaller. The power seems perfect to me and really controllable. Wheelies easy, and I can launch the front tire and hit the spot I want pretty easily on some steep dirt mounts I have set up.

    One other question. The front brake rotor seems like it floats. Is it suppose to be this way. It moves back and forth about an eight of an inch.

    Do you guys know if there is a Clymer style shop manual for this bike? And where should I try to find parts?

    Thanks again for the input.
    #15
  16. Huzband

    Huzband Team Dirt

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    Apparently not enough.
    #16
  17. laser17

    laser17 Long timer

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    FWIW: Manual is wrong - tranny takes 550cc, not 650cc.
    Floating front brake rotor

    Sounds silly, but make sure the tank bolt is tight - will cause you to think you have all sorts of motor issues if loose. Also, the tank vents on them had all sorts of extra plastic flashing and restricted the tank bleed. If it ever dies at full throttle, could be it. Was on mine.
    #17
  18. 2whlrcr

    2whlrcr gooligan

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    Theilman trials is May 20/21st.
    #18
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  19. Greebe

    Greebe Been here awhile

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    Wish I could go, but already have another trip planned that weekend. Will not be able to make one until July which is a bummer, but that is the way it goes.
    #19
  20. motobene

    motobene Motoing for 46 years

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    Chocolate milk for oil. Water pump seal needs replacing and check the shaft for a groove.

    These old bikes have a lot of entropy in them. Time and labor and especially knowledge can bring them back. You are in the right place for the latter.
    #20