Skip to content
View in the app

A better way to browse. Learn more.

Trials Central

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.
  1. Started by Robty250,

    Hi all, looking for some advice on a reputable supply of a seat for a C model onwards , was thinking of the yambits seat , does anyone have any experience / preference on what's out there . Cheers Rob .

    • 2 replies
    • 1.9k views
  2. Started by twinshocker,

    I have a 1974 yamaha ty250 . Does anyone know of anything to make it more snappy and powerful..It's on it's 2 nd overbore. I already has boysen reeds and a reed spacer .I also added a Sammy Miller silencer.It is already pretty good ,But i rode a ty at a trials and was amazed.in the difference in mine and the other one.The owner said he bought it that way. Anything will help Thanks

      • Like
    • 5 replies
    • 7.3k views
  3. Started by Sectioned,

    Made some crude footrest hangers and mounted by the usual method, drill and tap upper hole and welded a nut inside frame on bottom rather than a threaded rod right through. These are temporary to experiment with position before I commit to weld on mounts. Yes I've put them well back and that may attract some critisism but I am tall and heavy with chicken legs so if I lean forward the front end won't be light. Footrests are from an enduro bike.

      • Like
    • 8 replies
    • 3.8k views
  4. Hi there I have rebuilt the carb etc cleaned out gum but the bike won’t cold start.if you give it some help with easy start she does straight away .As soon as warm no problems any ideas out there please .Thanks John new to your site .

    • 13 replies
    • 4.9k views
  5. Started by bondy,

    Hello has any 1 had the TY 80 spokes from central wheels?if so do they fit?

    • 1 reply
    • 1.5k views
  6. I have a 74 model 250A serial number 434-011251 and I need the shop manual for it. That's the downside. Now the good side is that I also have a 1975 B model shop manual if anybody needs one.? Maybe we can trade? I have been using the info from the B model shop manual to do all a the tune up and work on the ignition (Magneto and Points/condenser) up to a point. I checked out the schematic for the B model and it seems to have a couple of things different about it that I can't find or explain on my A model. #1 There is NO DIODE in my wiring harness now. ( at least I can't find one) I don't know if it has been removed, or it never had one? Norm…

      • Thanks
      • Haha
      • Like
    • 18 replies
    • 8.6k views
  7. Started by RD4ME,

    I just picked-up a really nice 1978 TY250E. It's in great cosmetic condition and it starts easily, idles well and has a ton of compression. However, for a 250cc 2-stroke trials bike it seems to be a bit lacking in low end power. I figured that a bike would loop itself in first gear if it was given full gas and a good pull on the bars. On my bike - it takes a lot of effort to get the wheel just a foot off the ground. Part of this is poor rider technique, but I have other 2 stroke bikes and when they are in the power band - they rev-up like crazy! I posted a couple of videos below so you can see what I mean. It might be my expectations are too high for a bike with a h…

  8. Started by Junglejeff,

      • Like
    • 9 replies
    • 2.1k views
  9. Started by pjw123,

    Just acquired a Pinky in need of serious TLC. Mains in a bad way. Have a fully rebuilt S bottom end which I was considering fitting. Q: .is there much of a difference between S,R & Pinky bottom ends,

  10. Started by trialsrfun,

    I am thinking of making a new front exhaust pipe for a Yamaha TY 175 but have variously read that lengthening/shortening the front pipe on a TY 175 brings about a performance improvement but which is right longer or shorter, what difference would either option give?

      • Thanks
      • Like
    • 5 replies
    • 4.5k views
  11. Started by no5s,

    How do I get the clutch arm out? I can only turn the adjuster so far then it stops. I’m assuming it is still engaged in the arms shaft. Any help would be appreciated.

    • 5 replies
    • 2.2k views
  12. Started by Rake,

    Hi All, how disappointed is my 9 year old kid. we picked up a TY80 today only to find that the idler gear shaft for the kickstart is snapped and the gear and part of the shaft just fell out. he was in tears and me almost. Now I find that the part is NLA !! Can anyone aassist with any kind of fix possible or is this engine now done for ? Thanks in advance. Rake

      • Thanks
    • 9 replies
    • 4.5k views
  13. Started by james111089,

    Hi, Got a little ty80 but would like to know the, standard carb settings? Mixture screw? Main jet? Needle? would be very helpful

    • 6 replies
    • 8.5k views
  14. Started by jeffk,

    Can anyone tell me where the wiring harness boot is positioned on a 74' TY 250? I do not remember but it looks like it would be best with the big side inserted into the frame right under the fuel tank to protect the wiring. Anywhere else does not make sense. Thanks

    • 2 replies
    • 2k views
  15. Started by RD4ME,

    Looking for a new seat cover for my 1978 TY250. There seem to be more available for the TY175. I was wondering if anyone knew if they were interchangable? Thanks!

    • 5 replies
    • 2.4k views
  16. Started by Pikeyboy,

    Hi guys back again for some more advice on my TY175 I am rebuilding the engine and wondering whether I should fit an oversized piston. The original problem was a very noisy Rattalee engine coupled with loss of power. The writing on the piston is clear in the picture any advice would be most welcome?

      • Like
    • 5 replies
    • 4.1k views
  17. Started by johnnyjazz,

    Hope im not violating any forum rules by posting (please delete if i am) but from a historical collectors perspective the price blew my mind...In case you missed it..from last month at a bike auction in Vegas..Granted they're pristine concours rebuilds but to see them actually sell for this $$s...crazy! i guess some people have very deep pockets... -wife didn't think much of my TY project till she saw this...now she wants to help polish it!

      • Like
    • 4 replies
    • 3.1k views
  18. Started by bondy,

    Hello can any 1 tell me if the TY80 final End drive oil seal behind the front sprocket can be changed without splitting the engine? cheers

  19. Started by barfy,

    I recall reading somewhere about using a Gas Gas swinging arm in the TY mono back in the day. Am I making it up or was it related to another bike?

    • 3 replies
    • 2.2k views
  20. Started by Junglejeff,

    I just received a wossner oversize piston for my project bike.It does not have info on recommended clearance.Having no luck searching. If anyone can help me out here I would appreciate it.1974 TY250.

      • Like
      • Thanks
    • 13 replies
    • 4.1k views

Account

Navigation

Search

Search

Configure browser push notifications

Chrome (Android)
  1. Tap the lock icon next to the address bar.
  2. Tap Permissions → Notifications.
  3. Adjust your preference.
Chrome (Desktop)
  1. Click the padlock icon in the address bar.
  2. Select Site settings.
  3. Find Notifications and adjust your preference.