TY250C resto questions

[David Lahey]

Even using the rubber mounting, the tab on the frame will eventually break off. Yes if you use a solid link with the standard frame tab, it will probably break the frame tab off sooner than with a rubber mount. I weld on a more solid tab to the frame and use a solid metal link to the muffler. The solid link is sized to allow the link to bend rather than damage the frame.
The original design also has a problem in that it allows the muffler to wobble around so much it eventually damages the socket where the muffler pipe engages into the main section of the exhaust.
If you do want to use a rubber type isolator, they can be sourced from engineering suppliers, usually with a threaded stub both sides.

[horde]

Hi David,
Yes, the metal tab has broken off at the frame, I suspected it was from the original exhaust hanger having broken at the rubber, and being bolted back together, in turn causing vibration thru the mount... I think I'll grind the remainder of the tab off the frame, and make an alloy hanger up that mounts to the frame. Cheers again for your help David.

[horde]

Alright, so everyone says that when you own one twinshock, you end up owning two twinshocks (or more) ....so I now also own a 1974 TY250
Question time:
With regard to the "surfboard" seat arrangement on these earlier Yamaha twinshock 250's
- Does anyone make replica yellow seat bases?
- Are they available as OEM?
- Where can I obtain a replacement seat (OEM or aftermarket)?

Thanks in advance!
Lachlan

[David Lahey]

Alright, so everyone says that when you own one twinshock, you end up owning two twinshocks (or more) ....so I now also own a 1974 TY250
Question time:
With regard to the "surfboard" seat arrangement on these earlier Yamaha twinshock 250's
- Does anyone make replica yellow seat bases?
- Are they available as OEM?
- Where can I obtain a replacement seat (OEM or aftermarket)?

Thanks in advance!
Lachlan

People make replacement replicas of the seat surround surfboard from time to time but I'm not aware of any being advertised for sale currently. Have a look at France Trial Classic there might be something
Surfboards not available as OEM
Seats made to fit the fibreglass surround are different to TY250 seats made to fit the later models. Later model type seats are available, but you would need to fit mounting plates to the TY250A frame for the rear mount bolts.
There was someone in Victoria making replica seat bases for the early model TY250s a few years ago. I know this because they used an original seat base of mine to make the mould. I don't know if they are still selling them. The company was called Blue Monday or similar. I think I still have a replica seat base made by them if you decide to go that way.
Many people fit the later model seats to their TY250A or B and do away with the surfboard look.
C, D model seats are available from Sammy Miller Products distributors

[horde]

Thanks again for the assistance David, always appreciated! This gives me something to think about, perhaps I should be updating the bike with later model seat and guard...

[horde]

Attached is a pic of the second bike after a tonne of cleaning, and prior to stripping. She's now fully stripped. The frame / swingarm have been professionally sandblasted, and I have the frame primed in 2-pack 1 hour after it had been blasted.

Ive ordered frame parts from Sammy Miller and TYTrials, so this thing is under way! (stupid thing is that this was meant to be my "parts" bike for the other one!!)

Anyway, just thought I'd ask on here before I head over to the "wanted" section..

Questions:
-Can you buy a replacement flywheel cover for these bikes whether OEM or aftermarket? (missing the original magnesium type cover)
-Failing that, does anyone have one lying around they'd concider selling that isnt cracked anywhere?
-Anyone have a rear brake brace arm lying around in very good condition they'd concider selling?
-Does anyone know if "Forks by Frank" in the USA has an email address? All my research can only reveal a phone number...

The info I have received from this thread, as well as this forum have been a massive help, so once again thank-you!

[David Lahey]

Attached is a pic of the second bike after a tonne of cleaning, and prior to stripping. She's now fully stripped. The frame / swingarm have been professionally sandblasted, and I have the frame primed in 2-pack 1 hour after it had been blasted.

Ive ordered frame parts from Sammy Miller and TYTrials, so this thing is under way! (stupid thing is that this was meant to be my "parts" bike for the other one!!)

Anyway, just thought I'd ask on here before I head over to the "wanted" section..

Questions:
-Can you buy a replacement flywheel cover for these bikes whether OEM or aftermarket? (missing the original magnesium type cover)
-Failing that, does anyone have one lying around they'd concider selling that isnt cracked anywhere?
-Anyone have a rear brake brace arm lying around in very good condition they'd concider selling?
-Does anyone know if "Forks by Frank" in the USA has an email address? All my research can only reveal a phone number...

The info I have received from this thread, as well as this forum have been a massive help, so once again thank-you!

Yes there are new covers available made in Europe from composite materials but are quite expensive. I haven't remembered who the supplier is yet. The A model cover will also fit if you are looking for second hand. The flat sided magnesium covers ones are much harder to find in undamaged condition due to corrosion and being much more fragile.
It is easy to make a replica of the rear brake brace from standard size aluminium flat bar.
No idea who Forks by Frank are. There are hard chromers who do bike fork tubes in Australia (RAD Hard Chroming in Brisbane is one) and plenty of bike suspension specialists too

[horde]

Morning all,
Thanks again for the responce David. "Forks by Frank" is -as far as I'm aware- the only person in the world who manufactures aftermarket motorcycle fork legs. He makes legs for just about anything, and I understand that he keeps things in stock. I believe the prices are approx $250us for a pair.
If you google "forks by Frank" you will see a VERY basic website. I now believe the only way to order forks is by staying up late and doing an international phone order....

Anyway, update on the yellow bike - removed the 20+ year old dunlops off the rims yesterday, measured hub offsets, removed spokes, and begain polishing the rims and hubs -time consuming job this polishing!

Cheers
Lachlan

[David Lahey]

Maybe Forks by Frank are the people who make the new fork tubes that B&J racing (in the USA) sell for TY250s. With the US/Aussie exchange rate the way it is at present that might be a good way to go. The freight cost may limit the cost benefit though especially for people who live in Brisbane.

[David Lahey]

Anyway, update on the yellow bike - removed the 20+ year old dunlops off the rims yesterday, measured hub offsets, removed spokes, and begain polishing the rims and hubs -time consuming job this polishing!
Cheers
Lachlan

It is very difficult to polish the fins on the brake drums. I've always just cleaned all the old paint off and repainted them silver. That metal will need constant polishing unless you coat it with something.