Alloy swingarm for TM250

[tony27]

Don't see these come up often in this neck of the woods 

http://www.trademe.co.nz/motors/motorbikes/parts-for-sale/suspension/auction-477543186.htm

[TM BILL]

Pictures worth a thousand words 

[Simo63]

Pictures worth a thousand words 

Then that ad is speechless 

[tony27]

Tell the seller that, pretty sure Firko would be able to put up a photo of what it should look like

[TM BILL]

Pics up now , Shit its handsome 

[vmx42]

Here we go again... over to you Marc!!! 

[Dono113]

is it legal or will someone say it's not 70's issue

[firko]

It's actually a Boyd and Stellings swingarm, US Sports bought the jigs after B&S moved on to factory air conditioning. I've got one on my Maico 350 and a complete Boyd and Stellings framed (with alloy swingarm)TM400. They were the first commercially available and possibly the only truly legal pre 75 alloy swingarm, first hitting the scene in late 1969 I believe. They sometimes have a tendency to bend and/or twist so many survivors have been fitted with gussetting like the one for sale.
Below..my complete Boyd and Stellings framed TM400

Below..My beloved 350 Maico showing off its Boyd and Stellings swingarm. It's been on there longer than the steel original ever was and is still straight..ish

[Dono113]

Firko my man you are making me drool over the 400

[TM BILL]

Original ones like Firkos look the goods  its that awfull after the fact gussetting that makes them so hideous .

[Simo63]

It's bloody hideous IMHO.  Is that really pre 75 legal?

[firko]

Firko my man you are making me drool over the 400

It could be yours Dono....I'm planning on selling it later in the year, probably at CD9. You won't get a tricker pre 75 bike than this....190lbs, ready to ride.

It's bloody hideous IMHO.  Is that really pre 75 legal?

It's quite legal if you only use the rearmost shock mount. It's only "hideous" because of the tacky looking strengthening gusset. Remove it and weld a more subtle gusset, perhaps intergrating a chain tensioner underneath the arm an you've got a nice addition to your TM.

[GMC]

They do look a bit cumbersome with those afterthought gussets but I reckon the original version looked pretty neat.
The ‘later Swingarm of the Gods’ took gusseting to a whole new level but they were so bad they were cool.

They were sold under about 3 different names over the years but I think Boyd & Stelling were the original manufacturers.
They were well ahead of there time. Fitting cast and extruded sections together wouldn’t become common place until the late 90’s

From Cycle World 72

[Marc.com]

Original ones like Firkos look the goods  its that awfull after the fact gussetting that makes them so hideous .

No that is actually the before the fact gusseting Bill..... Firkos I suspect has had a form over function trim job.

I like the variety of shock position offered on the original arms, one swingam covered everything from trials to Wiowmaker Hill Climb

[Marc.com]