Twinshock & Classic Trials

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Last post by keithj « Tue Dec 28, 2010 11:24 pm
Posted in Trials Talk

by keithj » Tue Dec 28, 2010 11:24 pm » in Trials Talk

Due to the proliferation of spammers using hotmail, yahoo and gmail accounts, these have largely been "banned" as unacceptable email addresses for...

0 Replies

480724 Views

Last post by keithj
Tue Dec 28, 2010 11:24 pm
How to include pictures in your posts.

Last post by PA « Thu Jul 08, 2010 1:12 pm
Posted in Trials Talk

by PA » Thu Jul 08, 2010 1:12 pm » in Trials Talk

Click on the Attachment tab.
attachment tab.png

Click on Add files ... then select file from your computer.
add files button.png

Enter some...

0 Replies

478357 Views

Last post by PA
Thu Jul 08, 2010 1:12 pm
Photos on this board

Last post by keithj « Mon Jul 20, 2009 10:28 pm
Posted in Trials Talk

by keithj » Mon Jul 20, 2009 10:28 pm » in Trials Talk

All,

A reminder:

Prior to posting photos on this board, please ensure you have the copyright holder's permission to post it! If it's yours, no...

0 Replies

402695 Views

Last post by keithj
Mon Jul 20, 2009 10:28 pm

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Long term ownership issue with OKO K101 carburetor

Last post by brent j « Sat Apr 11, 2026 5:16 pm
Replies: 3
by David Lahey » Thu Dec 18, 2025 12:39 pm

I've been enjoying the performance benefits of OKO K101 carburetors on five of my old bikes for many years.
Because they work so well, I've been...

3 Replies

2172 Views

Last post by brent j
Sat Apr 11, 2026 5:16 pm
Basket Cases

Last post by Greg Harding « Fri Mar 20, 2026 8:09 am
Replies: 3237
by Greg Harding » Thu Jul 16, 2009 9:23 pm
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Hi Everyone,

Having recently discovered this forum, I have decided to list my basket cases and projects. My aim is to source parts that I need and...
3237 Replies

1779142 Views

Last post by Greg Harding
Fri Mar 20, 2026 8:09 am
Fantic 240 wheel rebuilding

Last post by David Lahey « Thu Mar 19, 2026 2:07 pm

by David Lahey » Thu Mar 19, 2026 2:07 pm

I haven't rebuilt any Fantic wheels before but am giving it a red hot go.
Spoking of the front wheel was today. I did the front first to ease my way...

0 Replies

130 Views

Last post by David Lahey
Thu Mar 19, 2026 2:07 pm
Magazine Articles

Last post by David Lahey « Fri Mar 13, 2026 9:32 pm
Replies: 168
by Greg Harding » Fri Aug 19, 2016 8:32 pm
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Hi Everyone,

Please feel free to join in and cast your Vote? All I ask is for you to give credit to the magazine simply by posting a photo of the...
168 Replies

310153 Views

Last post by David Lahey
Fri Mar 13, 2026 9:32 pm
TY250 fork tube replacement

Last post by David Lahey « Mon Jan 12, 2026 8:31 pm

by David Lahey » Mon Jan 12, 2026 8:31 pm

A couple of years ago I crashed this TY250 on some granite rocks which deeply scratched the left fork tube.
As a temporary fix, I smoothed down the...

0 Replies

2740 Views

Last post by David Lahey
Mon Jan 12, 2026 8:31 pm
Bultaco clubfoot muffler

Last post by Bully fanatic « Thu Nov 20, 2025 11:16 pm
Replies: 3
by David Lahey » Sun Nov 16, 2025 10:27 am

In about 1974, introduced their "Clubfoot" muffler on Sherpa Ts and Alpinas, replacing the "Banana" type and earlier "Triangle" type.
The Clubfoot is...

3 Replies

2342 Views

Last post by Bully fanatic
Thu Nov 20, 2025 11:16 pm
Yamaha 74 TY250a gearbox oil capacity/oil brand advice

Last post by Sharkie86 « Tue Nov 11, 2025 1:15 pm
Replies: 3
by Sharkie86 » Sat Nov 08, 2025 9:43 am

Hi,
Just interested in finding out gearbox oil recommendations for my recently purchased 74 ty250a.

-Is it 1Ltr the amount of gearbox oil...

3 Replies

2445 Views

Last post by Sharkie86
Tue Nov 11, 2025 1:15 pm
KT on market place.

Last post by whitehillbilly « Mon Oct 20, 2025 6:52 am

by whitehillbilly » Mon Oct 20, 2025 6:52 am

... =top_picks

whitehillbilly

0 Replies

4260 Views

Last post by whitehillbilly
Mon Oct 20, 2025 6:52 am
Some Twinshocks at a local ride last Sunday

Last post by brent j « Mon Aug 25, 2025 10:07 pm
Replies: 1
by David Lahey » Mon Jul 21, 2025 8:24 pm

There were thirteen riders at a local club ride last Sunday at Calliope, near Gladstone, of whom four rode Twinshocks.
The Fantic 240 is currently...

1 Replies

14080 Views

Last post by brent j
Mon Aug 25, 2025 10:07 pm
Queensland "Winter Classic Trial"

Last post by David Lahey « Wed Jul 16, 2025 8:53 am
Replies: 4
by David Lahey » Wed Jul 16, 2025 8:46 am

Photos of some of the bikes at the Winter Classic Trial last weekend at Birnam (SE Queensland)
I missed getting photos of a few including Justin...

4 Replies

24513 Views

Last post by David Lahey
Wed Jul 16, 2025 8:53 am
TY 175 timing other than stock

Last post by Takhli44 « Thu Feb 20, 2025 7:55 am
Replies: 12
by Takhli44 » Thu Jun 02, 2016 8:06 am
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Any experience using timing other than .070 inch before top dead center?

Recently bought a parts bike and got it to run. It seemed to run really...
12 Replies

39858 Views

Last post by Takhli44
Thu Feb 20, 2025 7:55 am
Green Cota - mystery solved

Last post by Kombivan « Sat Feb 01, 2025 4:46 pm
Replies: 28
by billy » Sun Apr 08, 2018 7:08 am
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I have read a number of articles on the history of the Montesa Cota including in the current edition of Classic Trial #24.
None of them have made...
28 Replies

36064 Views

Last post by Kombivan
Sat Feb 01, 2025 4:46 pm
Best fuel recommended for TY250 1974

Last post by Sharkie86 « Mon Jan 27, 2025 7:34 am
Replies: 3
by Sharkie86 » Sun Jan 26, 2025 7:27 am

Hi,

Just wondering what type of fuel most air cooled bike owners are using?
I have a 74 TY250 that I was running Ampol 91 (blue symbol at the...

3 Replies

4152 Views

Last post by Sharkie86
Mon Jan 27, 2025 7:34 am
Restoring a 1972 fibreglass Bultaco fuel tank

Last post by Bully fanatic « Sun Dec 08, 2024 9:35 pm
Replies: 3
by David Lahey » Mon Nov 18, 2024 5:27 pm

This Bultaco model 80 Sherpa T tank looks like it has seen a bit of action in its time.
I'm planning to use it on a Sammy Miller frame Bultaco I'm...

3 Replies

4006 Views

Last post by Bully fanatic
Sun Dec 08, 2024 9:35 pm
74 TY250a shark fin chain guard protector

Last post by Sharkie86 « Tue Nov 26, 2024 3:41 pm
Replies: 2
by Sharkie86 » Wed Nov 20, 2024 1:54 pm

Hi, I have a recently bought a 74 Ty250 that I’m looking at going in some comps with it next year (hopefully).

I began looking at the regs etc and...

2 Replies

3329 Views

Last post by Sharkie86
Tue Nov 26, 2024 3:41 pm
James Trials

Last post by whitehillbilly « Sun Oct 13, 2024 9:16 am
Replies: 1
by whitehillbilly » Sun Oct 13, 2024 9:15 am

Just wondering if my Old James is still around competing.
When I built it.
Thanks

whitehillbilly

1 Replies

3558 Views

Last post by whitehillbilly
Sun Oct 13, 2024 9:16 am
Cota 247 VUK Differences

Last post by David Lahey « Mon Sep 23, 2024 6:22 pm
Replies: 1
by CoolCat250 » Mon Sep 23, 2024 2:14 pm

Hello Trials Brains Trust,

I was wondering if anybody could tell me the differences between a VUK and Std Cota 247? Specifically of the year 1975?...

1 Replies

4114 Views

Last post by David Lahey
Mon Sep 23, 2024 6:22 pm
Sourcing Talon dished sprocket for TY250, 1974

Last post by Sharkie86 « Sun Sep 08, 2024 5:48 pm
Replies: 5
by Sharkie86 » Sat Sep 07, 2024 9:33 am

Hi there,
Just wondering if anyone knows where to purchase talon dished sprockets for a 74 TY250 in Australia? I remember I got some about ten years...

5 Replies

4158 Views

Last post by Sharkie86
Sun Sep 08, 2024 5:48 pm
Yamaha TY80

Last post by Kurt « Sat Aug 03, 2024 2:41 pm
Replies: 1
by Hagsta » Sat Jul 20, 2024 7:48 am

I lusted after one of these as a kid and always thought I would like to own one at some stage. I just never thought it would take me this long. I...

1 Replies

4200 Views

Last post by Kurt
Sat Aug 03, 2024 2:41 pm
TY 175 Fork Tubes

Last post by stevenfox « Thu Jul 04, 2024 9:36 pm
Replies: 2
by stevenfox » Tue Jul 02, 2024 10:58 pm

Hey Guys
I’ve decided to finish off my TY build and need a pair of fork tubes for a 175 , what is everyone using or getting them from ?

Cheers.

2 Replies

3807 Views

Last post by stevenfox
Thu Jul 04, 2024 9:36 pm
Uncanny valley

Last post by Bully fanatic « Wed May 15, 2024 9:48 pm
Replies: 3
by David Lahey » Mon May 13, 2024 5:35 pm

Repainting twinshock fuel tanks that have multiple colours and swoopy patterns and have them look like the original is a challenge. It's the main...

3 Replies

4337 Views

Last post by Bully fanatic
Wed May 15, 2024 9:48 pm
Twin Shock Tubed Tyres.

Last post by Rod « Mon Apr 15, 2024 9:43 pm
Replies: 5
by Rod » Mon Apr 08, 2024 8:32 pm

I can't seem to find my beloved IRC rear tubed tyre anywhere, does anyone know why they are so scarce?

5 Replies

6691 Views

Last post by Rod
Mon Apr 15, 2024 9:43 pm
TY250 ELECTRONIC IGNITION

Last post by tat ty « Tue Jan 30, 2024 7:53 pm
Replies: 4
by tat ty » Sun Apr 30, 2023 12:32 pm

So here is the quandry.

For some time now I've been umming and ahhing over whether to convert the ignition of my TY250 to Electronic.

I'm the first...

4 Replies

8387 Views

Last post by tat ty
Tue Jan 30, 2024 7:53 pm
Fibreglass Tanks

Last post by Hagsta « Mon Jan 08, 2024 9:24 am
Replies: 2
by Hagsta » Sun Jan 07, 2024 8:15 am

I have a fibreglass tanked Montesa 348 and 247 as well as a TY175 with a shedworks fibreglass tank. All tanks are in good condition with no leaks. I...

2 Replies

7830 Views

Last post by Hagsta
Mon Jan 08, 2024 9:24 am
Cota 247 gearshift

Last post by Hagsta « Tue Nov 07, 2023 6:39 pm
Replies: 4
by paulo » Fri Nov 03, 2023 4:42 pm

Hi all, I'm working through a few issues on a cota 247 that I've had in storage for a while. The latest is a stiff/non-returning gearshift. I'm going...

4 Replies

18773 Views

Last post by Hagsta
Tue Nov 07, 2023 6:39 pm
JASPER Villiers trials bike

Last post by bantambutch « Tue Sep 26, 2023 3:09 pm
Replies: 1
by R Lander » Thu Sep 21, 2023 8:55 pm

Hello everyone,
I am chasing any information or prospective buyers for "JASPER" Villiers powered classic trials bike.
Ridden by Ian Gaff and later...

1 Replies

10828 Views

Last post by bantambutch
Tue Sep 26, 2023 3:09 pm
Cota 172 Restoration

Last post by Phil 850 « Mon Sep 25, 2023 8:57 pm
Replies: 121
by Phil 850 » Mon Jan 25, 2016 8:37 am
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Hi all
I have just bought a Montesa Cota 172 to restore as a casual ride bike and possibly some trials days.
The bike is currently blue.
What is the...
121 Replies

210049 Views

Last post by Phil 850
Mon Sep 25, 2023 8:57 pm
Sammy Miller Highboy Bultaco

Last post by Greg Harding « Sat Sep 23, 2023 10:39 am
Replies: 10
by David Lahey » Fri Jun 30, 2023 11:40 am
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I'm on a quest to see if I like riding a Sammy Miller frame .
I know already that I love riding trials bikes and have spent many years getting my...
10 Replies

19913 Views

Last post by Greg Harding
Sat Sep 23, 2023 10:39 am
WHERE HAVE ALL THE CLASSICS GONE??

Last post by R Lander « Thu Sep 21, 2023 9:09 pm
Replies: 20
by logan » Wed Sep 23, 2020 2:25 pm
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Hi all,

Just to let you all in on a little secret,

All of the Classics have gone to Stanthorpe !!

Well not yet but very soon... not this weekend,...
20 Replies

27768 Views

Last post by R Lander
Thu Sep 21, 2023 9:09 pm
mystery bike quiz

Last post by llewdaert « Mon Aug 07, 2023 9:23 am
Replies: 3
by David Lahey » Sat Aug 05, 2023 7:56 am

A friend rode this bike at a trial last weekend and it was the first time I'd seen one.
Does anyone want to have a go at identifying it?

3 Replies

7069 Views

Last post by llewdaert
Mon Aug 07, 2023 9:23 am
TY175 clutch mechanism vs DT175 clutch mechanism

Last post by llewdaert « Tue Jun 27, 2023 8:32 am
Replies: 2
by David Lahey » Mon Jun 26, 2023 7:26 am

While I was working on the clutch cam on my hot rod TY175 recently, I checked to see if there was a cam that was in better condition in a DT175A...

2 Replies

6479 Views

Last post by llewdaert
Tue Jun 27, 2023 8:32 am
TY175 clutch mechanism

Last post by Bosco15 « Wed Jun 14, 2023 5:05 am
Replies: 1
by David Lahey » Tue Jun 13, 2023 7:10 pm

I'm always keen to have my bikes working as nicely as a 50 years old piece of machinery can be.
Lately our local rides have had some fairly extreme...

1 Replies

8158 Views

Last post by Bosco15
Wed Jun 14, 2023 5:05 am
'74 Ossa MAR.

Last post by David Lahey « Mon Jun 12, 2023 10:39 pm
Replies: 10
by Rod » Sun Jun 04, 2023 6:19 pm
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Hello ppl,
Does the MAR have an engine # stamped on it somewhere? If so, where please ?
10 Replies

21089 Views

Last post by David Lahey
Mon Jun 12, 2023 10:39 pm
My Montesa 349 Project

Last post by Kombivan « Fri May 05, 2023 10:09 pm
Replies: 89
by Kombivan » Fri Apr 04, 2014 3:38 pm
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349 Montesa Purchased 2004/5 with no compression not yet ridden 2014 March

Frame ready for powder coater & old rusted forks I learnt today the 349...
89 Replies

190252 Views

Last post by Kombivan
Fri May 05, 2023 10:09 pm
VERA.

Last post by whitehillbilly « Tue May 02, 2023 8:21 pm

by whitehillbilly » Tue May 02, 2023 8:21 pm

... _vera.html

whitehillbilly

0 Replies

15529 Views

Last post by whitehillbilly
Tue May 02, 2023 8:21 pm
Honda TLR200 vs Majesty 200

Last post by David Lahey « Wed Apr 26, 2023 9:16 pm
Replies: 1
by CoolCat250 » Mon Apr 24, 2023 1:06 pm

Hi all,

Was wondering if someone could shed some light on which is the better ride? Both are gorgeous machines.

1 Replies

6189 Views

Last post by David Lahey
Wed Apr 26, 2023 9:16 pm
WHO IS STILL RIDING THEIR ORIGINAL BIKE ?

Last post by tat ty « Mon Apr 17, 2023 12:22 pm
Replies: 26
by tat ty » Fri Jan 09, 2009 12:58 pm
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Bevs recent posting of photographs of herself, Howard and others riding during the 1970s had me search the albums.

During a ride with friends this...
26 Replies

27856 Views

Last post by tat ty
Mon Apr 17, 2023 12:22 pm
Montesa Cota colour code

Last post by Kombivan « Wed Mar 01, 2023 4:17 am
Replies: 3
by Cota 123 » Sun Nov 08, 2020 9:31 am

Hi,

I am hoping someone may be able to give me a colour code they have had success with? It's for an early Cota 172. I have found a couple of codes...

3 Replies

10252 Views

Last post by Kombivan
Wed Mar 01, 2023 4:17 am
RetroTrials

Last post by Rod « Mon Dec 26, 2022 6:54 pm

by Rod » Mon Dec 26, 2022 6:54 pm

For those that haven't stumbled across this excellent website yet, It's like an encyclopedia of the good old days of Trials.
Not the easiest to...

0 Replies

18867 Views

Last post by Rod
Mon Dec 26, 2022 6:54 pm
Yamaha discussion photo

Last post by yamfan « Fri Dec 02, 2022 11:33 pm
Replies: 9
by David Lahey » Fri Nov 25, 2022 9:16 pm

This lovely was imported new into Australia from the UK in 1981 or 82.
At the time there was a story in ADB Magazine about it.
If you know about this...

9 Replies

24413 Views

Last post by yamfan
Fri Dec 02, 2022 11:33 pm
TY B ( 493 ) crankshaft

Last post by David Lahey « Wed Aug 17, 2022 10:10 pm
Replies: 11
by Guy53 » Fri Aug 05, 2022 9:21 am
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Does anybody kbows if a DT crankshaft fit a TY 250 model 493 B model here in Canada

Guy
11 Replies

15733 Views

Last post by David Lahey
Wed Aug 17, 2022 10:10 pm
TY / DT 175 heads

Last post by Kurt « Tue Jul 05, 2022 5:10 pm
Replies: 4
by hot101rod » Fri Jun 24, 2022 2:26 pm

In looking at the Yamaha spec sheets for the 1975 TY175B and DT175's, the DT has a slightly higher compression ratio. The DT175 head has 2 spark plug...

4 Replies

8857 Views

Last post by Kurt
Tue Jul 05, 2022 5:10 pm
TY250A project for sale SOLD

Last post by Simon Colombo « Mon May 30, 2022 9:39 pm
Replies: 2
by Simon Colombo » Thu Apr 21, 2022 10:15 am

BIKE NOW SOLD
1974 TY250A for sale, matching numbers
Bike is complete but no headlight or tail light
I started the resto but now I don't have the...

2 Replies

7525 Views

Last post by Simon Colombo
Mon May 30, 2022 9:39 pm
Wanted: TY 175 left hand lower fork leg

Last post by husky005 « Fri Apr 15, 2022 3:02 pm

by husky005 » Fri Apr 15, 2022 3:02 pm

Wanted: left hand lower fork leg to suit TY175

Paul
0412237408

0 Replies

13729 Views

Last post by husky005
Fri Apr 15, 2022 3:02 pm
What is this coating

Last post by sharvie « Mon Jan 31, 2022 7:30 am
Replies: 6
by sharvie » Sun Jan 23, 2022 2:36 pm

Hi there,

Wondering if anyone knows what the original coating on this kick starter is?

Many thanks
Steve

6 Replies

7739 Views

Last post by sharvie
Mon Jan 31, 2022 7:30 am
TY175 chain guard

Last post by husky005 « Sat Jan 22, 2022 7:15 am
Replies: 2
by husky005 » Sun Jan 16, 2022 8:08 am

Wanted: Chain guards for TY175

2 Replies

6730 Views

Last post by husky005
Sat Jan 22, 2022 7:15 am
TLR 200 to TLR 250 magneto

Last post by eagle « Sat Jan 15, 2022 2:03 pm

by eagle » Sat Jan 15, 2022 2:03 pm

I bought a magneto cover about a year ago & finally decided to fit it in place of the damaged 1, I had a look @ the 1 i bought & thought to myself...

0 Replies

13511 Views

Last post by eagle
Sat Jan 15, 2022 2:03 pm
Is it worthwhile to lengthen swingarm TY 175?

Last post by Takhli44 « Thu Dec 23, 2021 6:43 am
Replies: 5
by Takhli44 » Thu Dec 16, 2021 1:47 am

Can you feel the difference? What about turning radius? How much length? What are the advantages?
I have tried running adjuster for chain all the way...

5 Replies

7651 Views

Last post by Takhli44
Thu Dec 23, 2021 6:43 am
TY175 - DT175 port timing and head differences

Last post by David Lahey « Sun Nov 07, 2021 8:02 pm
Replies: 16
by David Lahey » Sun May 11, 2008 9:34 pm
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Theres been quite a bit of discussion over the years about how to make a TY175 motor better for trials and a few people have discussed using DT175...
16 Replies

24351 Views

Last post by David Lahey
Sun Nov 07, 2021 8:02 pm
TY175 Crank case oil seal

Last post by David Lahey « Tue Oct 26, 2021 10:15 pm
Replies: 2
by yamfan » Mon Oct 25, 2021 5:07 pm

Hi, couple of questions my Majesty 200 is sucking in air from the flywheel side does anyone in Aus do replacement TY175 Crank case oil seals? also...

2 Replies

7238 Views

Last post by David Lahey
Tue Oct 26, 2021 10:15 pm

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