2003 GG 280 TXT

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

  1. Greebe

    Greebe Been here awhile

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    @laser17 Thanks for the nice description. I had hoped to get the carb pulled tonight, but had other obligations, plus another bike on the stand. Got the shock finished and installed on that bike though. When I get it pulled I will post up the pilot size. I am at 1200ft if that makes any difference. I just got home, but maybe I can still get out there tonight and work on it.
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  2. Greebe

    Greebe Been here awhile

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    I got the carb removed. The main jet is a 118 and the pilot jet is a 35. The carb looks pretty clean on the inside. The jets all look good. The only problem I see is that the o ring on the choke jet is a little torn. More or less it just has a little thin section that appears to be sheared off and hanging. What do you guys think? Should I change anything? Try to find a 38 pilot jet? If so can I just pick up any pilot jet from a dealer and it will work? Thanks.
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  3. lineaway

    lineaway Long timer

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    A 36 or 38 will work. The 35 is lean. Get a new o ring. It has to be a correct jet.
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  4. laser17

    laser17 Long timer

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    38 pilot jet. If you use a 35, you "should" end up with the fuel screw being out past 4 turns = No good. The 38 should put you right around 3 1/2 turns +/- 1/2 turn. (assuming you don't have other issues)

    I usually look up the part number for Dellorto parts here: http://www.dellorto.co.uk/product-c...burettors-parts/carburettor-parts/phbl-parts/

    and order them here: http://www.herdan.com/

    If you run into a min order at Herdan, I would add the entire gasket set - has all the orings inside the carb and maybe throw in a new fuel needle valve - the rubber tips wear out/get nicked and leak fuel into float bowl.

    Also, be very careful to make sure the air box boot is properly sealed around the back side (can't see it very easy) of the carb inlet manifold. I usually just feel around back there to verify there is proper alignment/sealed. It's not as prone to problems as the GG Pro's but it can occasionally happen on TXT's. Whenever working on carbs, make sure you can hear the slide snap to the bottom and isn't cable bound open. (don't ask me why I tell you to watch out for this)
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  5. Greebe

    Greebe Been here awhile

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    Getting my order together for the 38 pilot, float needle, and gasket kit. Should I order a different main jet or keep the 118? Anything else I should order for the carb while I am at it? Thanks.
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  6. Greebe

    Greebe Been here awhile

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    I went ahead and ordered a gasket kit, banjo fuel filter, 38 and 40 pilot jets. Float needle was good. Hopefully the 118 main and 36 needle is fine.
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  7. motobene

    motobene Motoing for 46 years

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    Like I've written about over and over, the main jets run rich. 115 is a safe bet.
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  8. Greebe

    Greebe Been here awhile

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    Thanks. However the order has already been placed, so I guess the 118 will stay for now. Before I ordered, I looked at your thread, "The Crying Shame of Jetting", where you had said, "For Dell'Orto On 250s to 300s I like a 118 main right on sea level and a 110 main at 8,000 to 11,000 feet. Proportion in between". So I was thinking that the 118 might be fine for around 1200ft, but maybe not eh?

    Based on the above I would think the following would apply?

    • 118 @ 0 ft
    • 117 @ 1000 ft
    • 116 @ 2000 ft
    • 115 @ 3000 ft
    • 114 @ 4000 ft
    • 113 @ 5000 ft
    • 112 @ 6000 ft
    • 111 @ 7000 ft
    • 110 @ 8000-11,000 ft
    Just to clarify, I am not arguing about jetting as I know nothing about these bikes yet, and I value your advice, but I am just curious to the working of these engines and jetting. The more I learn the better off I will be diagnosing, tuning , and maintaining this bike.

    Thanks again,
    Greebe
    #48
  9. Greebe

    Greebe Been here awhile

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  10. laser17

    laser17 Long timer

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    The 115 may be good, but the 118 should be OK for 1200 ft. Once you get the bike running off the pilot and needle super clean (clip in 2nd from the top - one setting leaner than stock), then you can worry about the 115. Your plug should tell you all you need to know if you really want to sort it. The TXT has such a tractor style of an engine, it's not as if your gonna get the instant snap like a pro has IMO. Maybe next time your getting some carb parts, throw in a 115 for comparison. It will probably clean it up a bit, but will also be risky if you do any sustained high-speed riding. The only problems Ive ever seen with those motors are usually piston related. (and those were flat worn out from MXing the bike)

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  11. Greebe

    Greebe Been here awhile

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    @laser17 thanks for the help. I will run with the 38 and 118 for now and see how it goes, plus put the clip 2nd from the top like you say.

    I also need to find some of the orings for the silencer. The engine was covered in a heavy layer of burnt 2 stroke oil from the exhaust leaking all over. Took over an hour too clean off a good 1/16" to 1/8" of gooey and crusted oil. The engine looks really nice now. Hoping to try to find the orings local, but not sure of the size. From my measurements I would guess that they are a Viton 28mm x 4mm, maybe? is sthere something I can use temporarily until I find something?

    One other thing I noticed is that there are two sets of wires that were just clipped off and left hanging out. One set of white and yellow going don to the brake pedal, which must have been for the brake like that is not present, and one set of red, white, blue, that maybe went to the front light or display, which is also not present. Any thoughts? I was thinking of using heat shrink tubing to seal them up. Do they need to be connected to anything?

    Thanks again.
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  12. laser17

    laser17 Long timer

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    I'd get the oring, but then again I thought it had a crush washer like the pro...... You could try using a SMALL amount of high temp sealant on the oring, but that can make a huge mess and a real PITA to clean up if more than just a whiff is used. I'd rather deal with a leak!

    Back then, the bikes came with turn signals and lights (mine did). People usually just cut them off. That was my 1st trials bike and I remember my Dad cutting the wires. I was like - WTF are you doing? Without looking up he just said, nobody keeps that shit. .... He was right.




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  13. motobene

    motobene Motoing for 46 years

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    Righto on quoting me on the 118 at sea level. Lots of variables, however.

    I just rejetted a 2,000 GasGas 321. It had 112 (which surprised me) and the usual 36. It was way rich on top (has a spark arrestor). I fit a 108 and it is still a touch on the rich side of optimal at 1,600 feet.

    Swapped a 38 for the 36. This bike wasn't grossly lean on bottom, just a little lean.

    Anyway, every bike is an individual, so a 118 in one bike might be peachy, and in another will cause some 4 stroking.
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  14. laser17

    laser17 Long timer

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    You guys have a lot more altitude experience than I do, so I'm sure it can go leaner. I also (upon further reflection) seem to remember that I mainly kept the 118 in my bike to keep things safe on the 3 mile road ride I did to get to my local trailhead. More recently (2008) I ran a 114 in my 250 pro with a PHBL26 and it could handle a 112 mid summer. (but that was cutting it close and NO road runs)

    Greebe - PM your address and I'll send you some jets for your carb. I think I have a few leaner mains kicking around somewhere.
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  15. Greebe

    Greebe Been here awhile

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  16. laser17

    laser17 Long timer

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    Jets are on a jet!

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  17. Greebe

    Greebe Been here awhile

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    Haha, clever!:lol3

    Thanks, it is much appreciated.
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  18. ADVCoop

    ADVCoop Long timer

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    Lazer is a good dude. He gave me the tip about my Beta before it even hit the market so I could be first in line to buy it because he knew it was the bike I wanted.
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  19. Greebe

    Greebe Been here awhile

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    Here is the before and after clean up pictures.

    Before
    dirty1.jpg

    After

    clean.jpg
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  20. 2whlrcr

    2whlrcr gooligan

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    Usually the glamour shots are soft focus, not the other way around.:D
    #60
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