Odd RM250 B frame and arm

[Marc.com]

RM experts any thoughts on this one. Swing arm has me wondering

[oldfart]

 what's with the bracing and holes......I get it - multi shock mount points

[TM BILL]

Arm looks like a modified A arm

[Marc.com]

its the bracing that has me interested, particularly the top of the swingarm forming top shock mount, never know when you are going to trip over something factory in Japan.

[monaro308]

Another variation of Orange County choppers spider bike - The Black Dildo Bike. 
 
Looks like its had the chop where the bottom shock mount is.
It is a strange bit of arm though marc

[number8]

Arm looks like a modified A arm

I would think Bill's on the money what are the forks like that came out of it do they go past the axle about 75mm or less.

#8

[suzuki27]

I remember reading that bracing the A arm was pretty common- and recommended by the "Experts" back in the day to reduce flex.

[Marc.com]

Yeah but not something Joe average Japanese racer would do in the day..... and this work was done nicely

[bazza]

mark,went to the Puhoi tavern for a jar today and while at the puhoi cheese factory saw one of those....lol  Baz

[TM BILL]

What do you want it to be Marc 

[Marc.com]

What do you want it to be Marc 

Thought you were about to tell me I had discovered a super rare works frame in a Japanese junk yard, it must happen soon. 

[TM BILL]

Id like to be wrong but i dont think much stuff made it back to Japan  most of the  stuff from Europe ended up in the English channel along with the luftwaffe 

Back to your frame though who knows  could be a factory special  any numbers on the frame , that arm looks like steel protoype of that pds  arm on your 125C .

Your in the hot seat  what was the Japanese domestic mx scene like in the mid to late 70s ? ive seen videos of earlier times in japan, it was amping in the late 60s early 70s 

[vandy010]

is there any way of identifying the metal used in the mod?
mild steel with the shit drilled out of it says to me a backyard bob style mod.
but if it's chromemoly or similar? then perhaps you do have something rare indeed...

[oldfart]

chrome moly was used on Suzuki production frames .....think it was around 1976
http://www.suzukicycles.org/photos/RM-RMX-series/RM250-brochures/1978_RM250_Aussales1b_840.jpg

[Marc.com]

Back to your frame though who knows  could be a factory special  any numbers on the frame , that arm looks like steel protoype of that pds  arm on your 125C .

Too true Bill, another Swingarm of the Gods perhaps. Though nothing I have ever seen is as cool as the swingarm on my 125C.

I like that the zig zag drilled out bracing that also forms the inside shock mount .... someone gave it some thought.... hell for $80 i may just buy it. The frame with all the bracing would look good chromed.