Yamaha XT500

Discussion in 'Thumpers' started by TimberlineAdventure, Mar 29, 2008.

  1. Old-Thumpa

    Old-Thumpa Gonna Duit!!

    Joined:
    Mar 13, 2009
    Oddometer:
    19
    Location:
    Harrogate, North Yorkshire/Adelaide SA
    Its a great thread you got going here guys, im interested in the upgrades you speak of, RM400N-T rear swing arm, YZ465 front end, seems like that combo would make for a pretty serious offroader, but the added length of the forks would only add to the problems with rake on the front end!!
  2. Bozola

    Bozola Complete Bastard

    Joined:
    Jul 9, 2006
    Oddometer:
    422
    Location:
    Waitsburg, Seattle and Biscuit Ridge
    [​IMG]

    It's a decent motor one you've replaced the stock rod with a Titanium Carrillo custom made $$$), upgraded the piston to an Arias, upped the compression to 13:1, and added a reinforced base plate between the cylinder and the case. The mounting bolts are a little susceptible to fatigue and cracking. Since they don't go all the way through the case, this can lead to embarrassing moments on the track.

    I guess the engineers put that red line there for a reason.
    [​IMG]

    After we modified the engine, tho', nothing we did fazed it.
  3. montesa_vr

    montesa_vr Legend in his own mind

    Joined:
    Mar 24, 2006
    Oddometer:
    1,911
    Great stuff, Bozola. The XT/TT engines were famous for grenading when piston speed exceeded 4,000 fpm. Glad to hear you discovered a way around it. Was there ever a retail source for the base plate or was that a one-off?
  4. Bozola

    Bozola Complete Bastard

    Joined:
    Jul 9, 2006
    Oddometer:
    422
    Location:
    Waitsburg, Seattle and Biscuit Ridge
    It was a one-off chunk of billet. I admit that was probably over kill as once you reduce the reciprocating mass and throw away the garbage stock rod the engine is pretty tough. All of the engines stopped detonating once we went with the Arias and Carrillos. The base plate stopped the case from fracturing. Good thing too...XT500 bottom-end are hard to find!

    Fun bike to race once you've gotten rid of the stock exhaust, carbs, wheels, rod, piston, seat, fenders, lights, battery, and centerstand. ;)
  5. Motorcycho

    Motorcycho Adventurer

    Joined:
    Oct 9, 2007
    Oddometer:
    99
    Location:
    Canaduh
    and it's street legal!

    [​IMG]
  6. grimmboy

    grimmboy Chris Grimm

    Joined:
    May 15, 2004
    Oddometer:
    886
    Location:
    Central Virginia
    My 77 with a few modifications...
    [​IMG]

    [​IMG]

    And my 81, I love these bikes, kick back and all...
    [​IMG]
  7. haydenslides

    haydenslides K Flotto-Myers

    Joined:
    Apr 16, 2006
    Oddometer:
    99
    Location:
    Port Angeles, Washington USA
    Thought i'd try to keep this thread going with some pix of my "rehabilitated xt"...
    [​IMG]
    [​IMG]
    [​IMG]

    My friend has a pic of the bike when i got it, i'll try to get it from him and upload it later. The xt was a basket case when i got it... replaced fork seals, gas tank, tires, handlebars, carb rebuild, new seat, new tt500 exhaust, chain, sprockets, case saver, rear fender, front fender, tail light, wiring issues, coil, and probably a few other things i can't recall!

    There's still more to be done, though. On cold start up, she smokes like a chimney, but after she warms up, no more smoking. I'm guessing i need to replace the valve guides... Any input from anyone on what all i should replace if i do it? valve guides, valve seals, maybe timing chain while i'm in there? Still got to fab a rear rack, get some handguards, fab a small windscreen, replacement forks w/ aluminum front wheel and disc brake...i'm sure i'll think of more!
    love this bike! torquey, simple, and fun...
  8. plugeye

    plugeye mc caregiver

    Joined:
    May 11, 2007
    Oddometer:
    4,539
    Location:
    Garland, Texas
    what sort of rear fender is that? plastic?
    does it shake like a vibrator? mines steel with rubber bushings, it shakes so violently cant keep taillights in 1 piece.
  9. haydenslides

    haydenslides K Flotto-Myers

    Joined:
    Apr 16, 2006
    Oddometer:
    99
    Location:
    Port Angeles, Washington USA
    yeah, it's an acerbis plastic fender. it definitely vibrates, but i haven't had any problems with it blowing bulbs out
  10. Richard_A

    Richard_A Adventurer

    Joined:
    Jun 4, 2008
    Oddometer:
    54
    Location:
    Salem Oregon
    put some leds on it
  11. plugeye

    plugeye mc caregiver

    Joined:
    May 11, 2007
    Oddometer:
    4,539
    Location:
    Garland, Texas
    been runnin the same LED for the last 2 years, thats stayin together... the cheap lens & wires arent holding up to the steel-fender 10+ richter magnitudes
  12. plugeye

    plugeye mc caregiver

    Joined:
    May 11, 2007
    Oddometer:
    4,539
    Location:
    Garland, Texas
    do you have a part number or model #?
    direct bolt-on or make-it-fit?
    thanks
  13. haydenslides

    haydenslides K Flotto-Myers

    Joined:
    Apr 16, 2006
    Oddometer:
    99
    Location:
    Port Angeles, Washington USA
    it's an acerbis "classic?" or something like that. they used to sell them out of chapparall motorsports, but i don't see them anymore. it was a universal model and took some trimming and drilling to get to fit...
  14. E-Jay

    E-Jay Adventurer

    Joined:
    Jul 22, 2009
    Oddometer:
    39
    Location:
    Utrecht, Netherlands
    [​IMG]

    [​IMG]

    This is a XT engine in a '78 Maico GS frame. Rides like crap due to very bad suspension; lot of work to do.

    I'm new here. My other rides are a BMW R100GS [​IMG]

    and a KTM 450 EXC (the KTM is for sale, now that a bought this beauty) I rode the Alto Turia Ride in Spain on both of them.
  15. BIG ED XT FAN

    BIG ED XT FAN Long timer

    Joined:
    Feb 18, 2006
    Oddometer:
    1,261
    Location:
    Finger Lakes Western New York
    I have a husk frame thats going to get the 500 motor!! Nice work!!:evil Welcome TOO!!
  16. motomotard

    motomotard Adventurer

    Joined:
    Jun 23, 2009
    Oddometer:
    90
    this is gorgeous, damn i want one

  17. SLIM JIMMY

    SLIM JIMMY Adventurer

    Joined:
    Jun 30, 2009
    Oddometer:
    64
    Location:
    MOOI RIVER KZN SOUTH AFRICA
    HEY DUDES

    ANY PICS OF THE XT 600 3AJ OUT THERE?:eek1
    CHEERS
    SUNNY SOUTH AFRICA
  18. Peke

    Peke Kloothommel

    Joined:
    Sep 14, 2007
    Oddometer:
    129
    Location:
    The Netherlands
    It dont belong here since this is a XT500 thread but what the heck. :evil
    [​IMG]

    Was mine, still miss it sometimes.
  19. SLIM JIMMY

    SLIM JIMMY Adventurer

    Joined:
    Jun 30, 2009
    Oddometer:
    64
    Location:
    MOOI RIVER KZN SOUTH AFRICA
    Hey Peke Dude

    Looks A Gem Shot , We Bussy Building One Out Here , Thanx For The Pic [sorry 500 Gods For The Interuptoin]

    Cheers All
  20. stteve

    stteve Been here awhile

    Joined:
    Mar 18, 2005
    Oddometer:
    382
    Location:
    Below sealevel
    I am a member of the Dutch XT&SR500 Club, and we did a little tour round Utrecht last sunday. About half of the group were on different brands and models (a few BMW's, 2 enormous Triumph Cruisers), some trailered their XT and some had a different kind of Yamaha, like my little TT350 but who cares.

    These XT's were participating
    [​IMG]

    [​IMG]

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    My little TT
    [​IMG]