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.

Twinshock

  1. Started by lms 6201,

    Have just brought home a 1974 alpina 350 (i am fairly sure , as it has a head that looks too small for the barrell) , what niche would this bike have filled ? got it started (BLOODY HELL !! the man said it hadn,t done much work he wasn,t lying , it,s got as much compression as my ty350) but haven,t ridden it yet so am not knowing what gearing is like , would it have been like a long distance trials bike perhaps? and i need one fork slider , one is perfect , one is cactus , thanks steve batkines bundaberg

    • 6 replies
    • 5.5k views
  2. Started by fatboyty175,

    hi ive got a dilemer with my clutch what it is is that i start the bike up and then pull te clutch in and put it into gear and it pulls away without even letting the clutch out

  3. Started by andy m,

    I am going to MOT the Seeley, The speedo that was supplied with it when new was never fitted to the bike. I noticed in The Four Stroke Finale book the Seeley in there had a speedo fitted low down on the right hand fork. The speedo drive on my bike is on the left and the cable is long enough to bolt the speedo on the top yoke. It is one of the last bikes produced, has anyone else got the same set up ? Also does anyone know what is the closest match for the red used on the frame. Thanks in advance.

    • 5 replies
    • 3k views
  4. Started by schweizmeister,

    Any other Twinshockers got an entry in the Manx Two Day? Is last man away on the Saturday good or bad? Last time I rode (1995, 240 Fantic) we supplied fuel in cans, which was transported to stops for us - is it still the same setup?

    • 5 replies
    • 2.8k views
  5. Started by tael,

    Having some issues getting my cota 247 to run, got a spark but no joy yet. Will be putting a new sparkplug in as soon as I can get to a shop (B8HS i believe, though its currently fitted with a BR6HS resistor plug), but in the meantime checking other issues, timing looks about right so thought i'd check the coil Its got a red HT lead motoplat and with a bit of searching found this site, (http://www.yankeetwin.com/motoplat.html) that states the resistance across it should measure between 7000-9000 ohms. Mine measures 12,150 every time. does this indicate that its snafu and i'll need to locate another?

    • 4 replies
    • 8.3k views
  6. Started by jaan,

    The kick start lever of my Montesa Cota 348 is bended out of shape. Can I try to straighten it (without heating) with a hydraulic press or will it shatter?

    • 5 replies
    • 2.6k views
  7. Started by neilfrancis,

    Hello I have got the engine of my 349 in bits and was wondering if anyone has some basic specs e.g piston bore clearance. It was particulaly noisey and Im trying to trace the reason. Also any tips on the engine build would be great. Thanks

    • 5 replies
    • 4.1k views
  8. Started by 2stroke4stroke,

    I've dragged the old units out the spares box and wonder if anyone can recall what pressure they should be pumped to. I did read somewhere that 200 psi was the figure but that seems more like that for air spring units and i certainly don't think my local Fox dealer had the equipment to pump or measure to that sort of pressure when he set them. I may have had a manual but that will be long gone. Any advice appreciated.

      • Like
    • 9 replies
    • 4.2k views
  9. Started by Johnbarnett,

    Hi there As per the title! Does anyone have a piston/rings or just a set of rings for a beta TR240 engine (199cc) message me or ring 07976647755 cheers John

    • 0 replies
    • 1.5k views
  10. Started by loydee,

    Hi after years of waiting came to try out me Fantic 200 (Back-kick model) and seems like clutch is stuck. Maybe due to standing I know but I also had some of the pushrod parts fall out a coupla years ago when I fitted an extended arm (for lightness). Just in case I fitted in wrong what is correct order please. As engine is lying on clutch side what order do you insert components down the tunnel? Thanks :-)

    • 1 reply
    • 2.7k views
  11. Started by jaan,

    Venhill advices to use a few drops of a light 3 in 1 oil to lubricate the inner cable. What's that light 3 in 1 oil? To nipples Venhill advices to use copper grease. What oil and grease you use to the inner cables and nipples?

    • 2 replies
    • 1.6k views
  12. Started by gordo,

    I'm sure this topic is similar to asking what type of oil you use, but I'll ask anyhow. I have a Penton/Wassell trials bike that I've been competing with regularly. Right now I have an old set of Betor shocks I took off my Ossa MAR. I want to replace these old Betors with a modern style shock, and would like some opinions from you folks as to what you would recommend. The only thing I do know is I've seen new Betors that didn't make it through a season (bent). And I've read about others leaking. Any advice will be appreciated.

  13. Anyone know a good paint product for respraying MH/Cota 200 plastic tank? Any prep tips also very welcome!

  14. Started by scotty,

    was the kt 250 any good back in the 70's, i was to young to remember it coming out back then! must be one of the most beautiful trials bikes ever produced!

      • Like
    • 31 replies
    • 51.2k views
  15. Started by penno350,

    Can anyone recommend a good wheel builder in the North West (England)

    • 3 replies
    • 2.3k views
  16. Started by jaan,

    Have I to oil the new air filter foam of Montesa Cota 348? The Owner's Manual tells nothing about this matter.

    • 1 reply
    • 1.6k views
  17. Started by majesty320,

    Hi I was wondering what people are using to remove the paint from engines other than blasting. I dont want to strip the engine other than removing the head and barrel as it was rebuilt nt long ago and im not doing a total resto but just want to tidy it up a little. I then want to repaint it but dont know which paint is best. I dont have access to a compressor so two pack paint are no use, I was thinking of one of the aerosol types but dont know which is suitable. Thanks in advance

    • 6 replies
    • 2.7k views
  18. Started by brian r,

    SWM Jumbo on e bay, another on parts.

  19. Started by rock hopper,

    Have a 348 montesa 1977 was wondering what bike should be gapped and timed,also bike has a delorto carb on it a phbh26 cs r4173.was wondering if anybody might know or have any recommendtions on how to jet this carb or what it could of come with stock and was it ever used on these bikes thanks

    • 1 reply
    • 2.9k views
  20. What twinshock in your opinion will be worth the most in five years time? I'd say of the big three , The Ossa mar should in theory be worth the most as they were the least sold! so would that make them more sought after?

    • 15 replies
    • 5.9k 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.