1973 TS400 gets a second chance for city life.

[busa1300]

Tired of the complex modern two strokes I have been finding parts for to keep them alive. I decided I needed something simple to rebuild to get myself back into enjoying working on bikes. And what could be easier than a big ass weed eater powered two stroke.

supermoto style…..

anyone in the UK build pipes for these…?

 

Edited May 1, 2023 by busa1300

[TonyGee]

that brings back memories of my very first bike when i was 15, a TS125, loved it.   

I also put a set of road wheels on a YZ490 way back in the mid 80's just to see what it looked like, never knew anything about supermoto's back then. 

[Fazz711]

Looking forward to this build.

Luv the  TS

[busa1300]

Rims and spokes ordered…$$$$ 

also put myself in line for a new pipe from Jemco….

All of those parts are completely unnecessary to rebuild  this bike… which is why I bought those first.

Also working a deal on a TM400 cylinder and head for some added insanity.

[TonyGee]

1 hour ago, busa1300 said:

Also working a deal on a TM400 cylinder and head for some added insanity

feck !!!!!!  it will be insane with a TM top end 

[busa1300]

Parts….!!!!
Time to get off my ass and start cleaning up and drilling out some hubs, and relearn some lacing tricks.
 

 

 

[TonyGee]

its good brain food lacing up wheels, very satisfying   whats the plan with the suspension ? leave standard or jack up a bit ? 

[bluedog59]

Spoke wheel building, best done in peace and quiet with the phone turned off.............and a beer waiting in the fridge for when it finally spins straight and true. 

[busa1300]

New rear shocks, but will be same 13 inch dimension. Forks will get rebuilt with emulators, but not sure if I’ll change the spring or not yet. 
It will basically look restored when done other than the wheels and pipe….but should have a bit of a bite to it. Just a fun bike, and something to get me back into the mood of building bikes again. It’s an experiment more or less….not sure if it will be what I think I wanted until done.

[Wagola]

Is it finished yet ?

[busa1300]

I wish it was, but still searching for parts I will need for the rebuild. Going to a swap meet/auto jumble tomorrow to try and find a few things.

[busa1300]

Finally got my wheels put together today. Need to make sure they are straight after I get my wheel bearings in… then some tires, and I can see if they are going to fit.

Edited May 26, 2023 by busa1300

[busa1300]

 

     

 

 

 

Edited May 28, 2023 by busa1300

[Madb]

RM barrel, piston and head, carb May drop straight on for a quick power boost.

[busa1300]

The RM was later in the 70’s. Very different engine castings. RM had reed valves where the TM/TS was piston port design. The RM came from the race only TM, and the TM and TS are almost identical except for the cylinder.

the TM cylinder will give at least an extra 5-7HP, over the TS

Edited May 31, 2023 by busa1300

[busa1300]

Searching and buying parts I need is taking some time, as well as $$$ I had not planned ahead for. So while the project is setting, I decided to get my VJ23 out for the first time this year, and clear out some cobwebs.

TS400 / VJ23

Polar opposite’s as far as two stroke tech is concerned in almost every aspect.

Hopefully the TS/TM400 will be just as fun…..

 

_______________

[Madb]

On 5/31/2023 at 2:11 PM, busa1300 said:

The RM was later in the 70’s. Very different engine castings. RM had reed valves where the TM/TS was piston port design. The RM came from the race only TM, and the TM and TS are almost identical except for the cylinder.

the TM cylinder will give at least an extra 5-7HP, over the TS

The early RM's were piston ported, It was the early 80's when they went water cooled they then added the reed valves.

[busa1300]

3 hours ago, Madb said:

The early RM's were piston ported, It was the early 80's when they went water cooled they then added the reed valves.

The 78-80 RM400 had what Suzuki called power reeds

Edited June 11, 2023 by busa1300

[busa1300]

Some parts showing up. TM400 cylinder, new Wiseco 1mm piston, and the closer ratio TM400 trans.
 

[busa1300]

Engine is out….original piston still installed….all looks good but will be completely rebuilt regardless.
 

differences between TM and TS cylinders … bigger intake port on the TM

Taller deck height on the TS as well as the compression release valve and exhaust port flange. The TM and TS use the same piston and head, the lower deck on the TM is where the higher compression comes from.

 

As well as bigger ports inside the TM400 cylinder compared to the TS400

 

____________

[busa1300]

My pipe showed up at my doorstep today, built to TM400 specs but TS400 mounting position at the baffle.
 

 

[TonyGee]

that is really nice 

[DAZ]

More snap crackle and pop than a box of rice krispies 

[Wagola]

Is it finished yet ?

[busa1300]

On 7/29/2023 at 7:33 AM, Wagola said:

Is it finished yet ?

Well…. The pipe and the wheels are