The XT350 thread

Discussion in 'Thumpers' started by Burtonridr, Sep 26, 2007.

  1. Bake

    Bake adventurer

    Joined:
    May 15, 2005
    Oddometer:
    10,605
    My 2000 XT. Just a decent little enduro bike. Light duty pretty much, but I rode mine all over Colorado a couple of summers, and just had to be careful I didn't bottom the soft rear shock. I did a few changes to mine. I highly reccommend changing the front brake hose out to a stainless braided hose. Those big long fat rubber brake hoses are robbing you of half the brake's power. After the first trip to the mountains, I regeared it with a 3 tooth larger rear sprocket. It has Kenda Trackmaster tires on it. Great for the dirt, a bit slippery on pavement if you're leaning it over a lot, but they are street legal. First thing I did was replace the mirror with an Acerbis, install the Maier handguards, and pull those huge turnsignals off and mount up the little mini's.
    I always thought the 2000 was a nice looking bike.

    [​IMG]


    13,000 ft near Monarch, Colorado. First trip out there with it. Geared too tall for this type of riding.

    [​IMG]
    #21
  2. FatboyXT

    FatboyXT Adventurer

    Joined:
    Feb 19, 2007
    Oddometer:
    15
    Jetting the XT can be a little tricky because of the dual carb setup.

    First off drill out the plug over the mixture screw.

    Then shim the needle up with a washer, one of the sites suggest getting the needle from a TT350 since it has the grooves and circlip to adjust it with.

    Then I purchased another pilot jet and with those tiny drill bits I drilled out the pilot jets one step at a time until the screw was at 1.5 to 2 turns out and it was running a little rich, then I went back to the last size(that is why you buy a second one).

    Be careful with the adjustment for the butterfly on the secondary carb. If you go to far the thing will run great in the mid to upper range but it will not idle.

    I have heard about people messing with the springs and airjet on the CV slides.

    It doesn't hurt to open the airbox a little and the exhaust too. I have a Cobra exhaust which really opens it up and saves a few pounds. Problem is that it is too loud. So right now I am running the stock exhaust with the screen out.

    It starts very easy when warm and takes only a couple of kicks when cold.
    #22
  3. kta

    kta Been here awhile

    Joined:
    Sep 10, 2007
    Oddometer:
    596
    Location:
    Antigua, Guatemala
    Do you guys know if the TT350 and XT350 share intake manifold boots? I just picked up an 86 TT350. As far as I know the motor and carbs are the same, I'm curious what the actually changes were from the TT to the XT (obviously the electrical system). I'm searching for a few used parts.
    #23
  4. Bake

    Bake adventurer

    Joined:
    May 15, 2005
    Oddometer:
    10,605
    On Tomichi Pass, Colorado.

    2000

    [​IMG]
    #24
  5. Burtonridr

    Burtonridr Wanderlost

    Joined:
    May 24, 2006
    Oddometer:
    3,861
    Location:
    Idaho
    What do you mean no air?

    You can actualy get an aftermarket rear spring for the xt350, check out the first few posts in the thread, one of the links I posted will get you to it.... I think it is the xt350 page that has some mods on it.
    #25
  6. TTKlaus

    TTKlaus Been here awhile

    Joined:
    Jul 7, 2006
    Oddometer:
    329
    Location:
    New Mexico
    The primary gearing is different between the TT and the XT, the oilpump has a nylon gear on the XT, metal on the TT. The airbox flows much better on the TT. I believe the intake valves and perhaps also the cam is different. And I thought the carb is slightly larger on the TT. All that gives you about 3 HP more on the TT.
    The trick with the carbs is to get the 2 carbs more balanced. On the TT the stock jetting is 122 primary/125 secondary. I run 118/120 on my TT. I also run a ported head and a K&N filter. I did go back to the stock exhaust many years ago beacause of noise, and also found out that the bike was actually easier to ride on singletrack in the woods. The powerband is much smoother and broader, and it's in stealth mode.

    TTKlaus
    #26
  7. Burtonridr

    Burtonridr Wanderlost

    Joined:
    May 24, 2006
    Oddometer:
    3,861
    Location:
    Idaho
    So can you swap the carb and air box off the tt and put it on an xt?
    #27
  8. TTKlaus

    TTKlaus Been here awhile

    Joined:
    Jul 7, 2006
    Oddometer:
    329
    Location:
    New Mexico
    I'll check my manual later and tell you what size my carbs are, I think they are 2mm larger than the XT carbs, the intake valves are 1mm larger. Swapping the airbox would not be an easy task, the TT box uses the entire triangle space behind the shock, up to the seat and from left to right. You would have to make mounting brackets and find a different place for the battery. I think you'd be better off getting a K&N filter and jet it right, definetely more bang for your buck, and take off the airbox snorkels.

    TTKlaus
    #28
  9. VegasRider

    VegasRider Ya, I'm a n00b.

    Joined:
    Nov 6, 2007
    Oddometer:
    297
    Location:
    NV, Henderson
    That dang TW200 thread prompted me to take a look on CraigsList. No luck. nothing at all.

    Then I found this cute little XT350 here: http://lasvegas.craigslist.org/mcy/606615891.html Does that look like a good deal? It's by where I work so I called & will probably go take a look next week.

    So, stupid question... Are these kick-start only?
    #29
  10. StuckXJ

    StuckXJ Adventurer

    Joined:
    Feb 10, 2006
    Oddometer:
    61
    Yea, its a kick start only bike. It does have a decompression release and mine always starts on the first or second kick, usally first. Looks like a nice bike, did you get a chance to check it out?
    -Steve
    #30
  11. nails1

    nails1 nails1

    Joined:
    Feb 21, 2008
    Oddometer:
    187
    Location:
    New Mexico
    I rode MX in late 70's and only street since, so I'm not the best of judges. Got a 99 XT 350 last month (1400 miles, $2K, not the best of care). I don't really understand why folks are so apologetic about it, like DR having more power (both are 27hp at 7600-8K). Not sure about that "17hp restriction" (mine is apparently after that). Seems to run great.
    Right now, I'm waiting on carb parts mostly to replace bad rubber (definitely fuel leaks, suspect air leaks). I'm also fussing with jetting -- I live at 7500 ft elevation, so the Webistan jetting info doesn't work for me ;( Moose mini bars and handguards installed.
    Everybody says to do the 428 to 520 chain swap.
    From what I've found, the only significant and easy power mod appears to be Supertrapp and jetting. This "XT350 power" thread as various info http://www.thumpertalk.com/forum/showthread.php?t=361620&highlight=XT350+power Seem to be mixed reviews about White Bros powerup kit (if even still available).
    I've heard of progressive spring replacement for forks, as well as fork swaps (seem to lead to a lot of other fussing). This site http://www.xt350.de/viewtopic.php?t=2061 lists the original front spring specs.
    - Frontspring : K1 = 3,4 N/mm (19,6 lb/in)
    - length new : 580 mm (22,835 in)
    - lenght bad : 575 mm (22,638 in)
    Seems like something might swap-in off the shelf -- anybody know of a way to sort that out? This site has more info http://www.thumpertalk.com/forum/archive/index.php/t-437922.html
    I understand rear progressive swaps are available for some $500.
    I've given up on using an oil cooler for various reasons, including messing with that oil line to the head seems like a bad idea after all. Has anyone had luck with an oil temp gage on this sump system?
    http://www.advrider.com/forums/showthread.php?t=263871 has specs for a roll-your-own battery eliminator.
    #31
  12. TTKlaus

    TTKlaus Been here awhile

    Joined:
    Jul 7, 2006
    Oddometer:
    329
    Location:
    New Mexico
    I have an oilcooler on my 350. Also, I used to run a Supertrapp, but now I'm convinced that the noise/power tradeoff is not worth it. For your elevation I would think that a 116-118 primary main and a 120 secondary main is in the ballpark. I also live in NM near 6500 ft.

    TTKlaus
    #32
  13. nails1

    nails1 nails1

    Joined:
    Feb 21, 2008
    Oddometer:
    187
    Location:
    New Mexico
    Thanks. I think XT and TT got way different stock jetting. I just ordered 104/124, which I believe is one (small) step lean from stock (my plugs are a black kind of tan). How did you fit the cooler? Maybe PM a photo? I'm near Pecos. Carb parts probably won't make it this weekend tho. :cry
    #33
  14. TTKlaus

    TTKlaus Been here awhile

    Joined:
    Jul 7, 2006
    Oddometer:
    329
    Location:
    New Mexico
    Nails,

    I'm just down the road in Lamy. I've found that the closer together you can get the 2 carbs in jet sizes the better they work, they are a pain in the ass until you get them right. I will try to get a pic posted about my cooler, it hooks into the oilfilter cover (custom made), that way all of the oil gets cooled, not just the oil that goes up into the head.

    TTKlaus
    #34
  15. StuckXJ

    StuckXJ Adventurer

    Joined:
    Feb 10, 2006
    Oddometer:
    61
    I'm lost as to what to try next so I was hoping one of you guys could help. When I put the bike away for the winter it was running well. I change the oild tear apart the carb, and fresh gas... Now it starts like it used to, one kick but, it revs high but besides that runns great for about 1 min or just far enough, usually down a hill, away from my tools and a safe place to wrench. (far and few between on a college campus) So then i try and kick start it for a few and it usually starts with only a little more trouble than usual. But now it revs high and has no power, shifting into gear is enough to kick it. Adjusted the clutch, I first thought that to be my problem, but no... I can fiddle the choke, as i had to last year, to get it to idel right but still no power. If I give it gas it will hesitate then rev but still once i try to get it rolling it just bogs and dies unless i grab the clutch. I was thinking maybe the petcock, its old and needs to be replaced but up until now has been working ok. I was thinking that the bowl was draining out of gas and not filling up fast enough to keep going? Once it sits for a while, 20 min or so, and I start it it will then act like it did in the beginning, runs great for a min or so. Only 2 weeks left untill summer break and i'll tear it down at home and paint it up nice replacing all the old warn parts, but for now its just taunting me sitting outside the dorm window. Thanks for any help!
    -Steve:huh
    #35
  16. Ziggy

    Ziggy n00b

    Joined:
    Dec 7, 2003
    Oddometer:
    3
    Location:
    Ontario
    I just got a 2000 XT350 it seems to be backfiring through the carb. It
    starts good but when it gets warmed up it misses and backfires through
    the carb. I changed the spark plug and looked for air leaks. Changed
    the secondary carb inlet which the rubber had separated from the
    mount. The air filter is clean I even left the cover off but no
    difference. I checked the gas flow from the petcock and it's full
    stream. I'm stumped! Also do these bikes always run hot?
    #36
  17. SkidMarx

    SkidMarx Long timer

    Joined:
    Mar 27, 2006
    Oddometer:
    3,095
    Location:
    Ortonville, MI
    I can't believe I missed this thread.

    My '90 XT350 Post rebuild.
    Stripped it down to the frame.
    Cleaned repainted, and/or polished everything. in process pix here
    Put new fork seals in with 15wt oil (thats how it all started)
    Added seal savers.
    Moved the clip on the rear shock down one spot.
    The fenders are from a YZ 125. Front one is shimmed a little so it fits.
    The rear is the back 1/3rd cut down and heated a little so it would fit better.
    Cut the stock plate holder cut down and rolled up further into the fender.
    Added a LED brake/tail light.
    Relocated the case vent.
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    see a few more pix here

    Other mods already done.
    Uni air filter
    Home made PowerNow inserts
    Rejetted
    Heavy duty valve springs w/Ti retainers
    Repositioned horn for better airflow in left scoop
    Ground the weld off of the inside of the header pipe. (not sure if it helped any)
    H4 Headlight bulb.
    #37
  18. The Full Monty

    The Full Monty Adventurer

    Joined:
    Jun 25, 2008
    Oddometer:
    97
    Location:
    Clear Lake Shores, TX
    Hey does anyone know where the turn signal flasher is located? I think it is under the tank, but it would be nice to know before I get started.

    Also, do I have to get a specific Yamaha flasher or will any do?

    Thanks!
    #38
  19. The Full Monty

    The Full Monty Adventurer

    Joined:
    Jun 25, 2008
    Oddometer:
    97
    Location:
    Clear Lake Shores, TX
    SkidMarx, Great job on the '90 XT! Hope mine looks that good one day!
    #39
  20. SkidMarx

    SkidMarx Long timer

    Joined:
    Mar 27, 2006
    Oddometer:
    3,095
    Location:
    Ortonville, MI
    Thank, and btw, I'm pretty sure the the flasher is under the tank.
    #40