Lightweight TS250/350 - Cycle Guide article.

[mx250]

Just in case you are feeling unloved over here in Suzy World..........

 

[TT5 Matt]

nice read and like the power of the motor i just dont like the std ts250a frame,maybe it needs a sharpen up of the steering head angle and a motor '"drop" to get to handle

[Gerard De Ruyter (Twistandshout)]

mx250 - do you know what the 322cc donor piston was from for this big bore job?

[lukeb1961]

mx250 - do you know what the 322cc donor piston was from for this big bore job?

a clue is that the TS250 is 70x64 and to get to 322 would mean 80x64
so what ran an 80mm piston back then? the TM400 had an 82mm piston.
The Yamaha RT360 had 80x70, so that could be it?

[Doc]

Someone did tell me years ago which piston was used for the 322 conversion but I can't find the pertaining email..I don't think it was RT360 due to the windows in the back of that particular model piston. Maico keeps coming to mind but I can't be sure fur sure The kit parts for this model are rare..over the years I was lucky to find a kit ignition and pipe but little else nor have I ever seen anything else advertised. Was told by people from the era that the trick to getting the type I and type II '69/'70 TS250 to dirt track standards was to use the same mods they used for the TR roadracer and T500 roadie as the engine is basically a T500 cut in half.



 Some tech reference can be found in the links below.

http://www.ozebook.com/compendium/t500_files/grant/grant3.htm

http://www.ozebook.com/compendium/t500_files/tech.htm



 

[TT5 Matt]

rt1 were piston port where rt2 and 3 were reed valved type pistons

[lukeb1961]

rt1 were piston port where rt2 and 3 were reed valved type pistons

OK, so what else back in '70/'71 had 80mm or so?  CZ360?  Anybody know the bore of a Maico MX360?
just trying to think what piston it might have been.
What about snow-mobiles back then? Sachs or something?

[Dono113]

Man great read.. very interesting indeed, need to find that donor piston

[OverTheHill]

talking of 80x64 i have a spare 360 Rt2 motor set up like that, [why] just because i could. Must get back to it as [do] want to know how it'll run. I used a 250 crank in a 360 cases, set piston at bottom of ports [spacer under barrel], the took ummm--6mm off top. Will run oneday, just not sure how well. I'll report in with the bad news[or good]. Always wondered what size it is so 322cc looks like it. Could have been a piston port RT1 piston [as mentioned] in the TS250 mod. Always thought a good [mod] trick on a DT360A would be an SC500 top end as same base stud pattern & 70mm stroke [way over square] just cases are cast in to edge of cylinder liner where it sits down in cases so could easily be modded. Gosh your mates would wonder what the hell you'd done to it overnight as you wheelie past. I feel another [silly] plan coming on.

[Dono113]

Did we work out the piston type?

[albrid-3]

I like this bike, very neat and clean lines.

[albrid-3]

An AJS Stormer 370 may do the job.

[YUMASTEPSIDE]

I've been working on one of these myself for a while now, from what I can work out they use a Beamish piston ,as in the trials  RL's, they  too much wheelspin to use as solos but powered the side hacks quite well.
  The Beamish RL's had the exhaust port on the opposite side to the TS's, but I am looking at making my own sleeve . The pistons are still available from France at about $280

                         

             Early Beamish 322 RL

                       

             The start of mine

                                           Roger

[Lozza]

Geez that Ag bike come together well, though you might have to spend some $$ on the suspension, be awesome little bike

[SON]

From a bad memory the 80mm Piston was from a SUZUKI Outboard that was NLA 10 years ago.