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To me it looks like a normal European model RD250/400 from 1976/77 and USA model RD400 1976-78 fork.
Regards Uwe

Very nice

something similar...

https://www.vintagemx.us/cgi-bin/racephoto.cgi?3ee0d6965c134c90b8b8e223549259fa

@RDnuTZ,
the bike in your link is a very different breed. 1 Cylinder 4stroke engine.
Regards Uwe

@RD350NL
I have a couple of carb charts, parts lists and manuals, both USA and Europe versions, but not in one is a #130 stated for a 350. For a 73/74 350 always the numbers Mark stated or a #105 main jet, 5L3 needle, 2.0 carb slide with a baffled airfilter for the 1975 Europe B model which was a slightly different model to the USA B ones.
But carb fine tuning always depends on your own engine.
As @sav0r wrote. Start rich and work down if needed.
Regards Uwe

I am pretty sure that the Robinson 4LS brake on this tracker is a replica one. They cost around 1300 Dollar in Europe.
I agree with Mark, the brake doesn't make the bike neater and I am not sure if it help to perform also. I have such a brake lying around but not on a bike so far.
Regards Uwe

I agree. It is not best solution optical wise. If it would be my own bike and own decision I would go another route. We have to use a period solution and that is the cheapest option. But it is race bike so optics are behind function.
Myself I would go the Lockheed or Brembo P05 route. I have a RD250 race bike with a Lockheed caliper and EBC disk. It is a good combo. Obviously it need an adapter also.

Only sliders won't work. They are for 35mm stanchions up to 1978 or 36mm 1979/80.
Complete TZ fork is just too expensive for the bike we will build.
Background is that our team build a bike out of leftover parts which we will lent newcomers for free. Everybody of the team donated parts which he had lying around. The TZ rotor is not a must, we can always start with a RD rotor but we have it. As a friend builds a RD caferacer with a TZ brake we thought we try to get an adapter. If we don't find one we have to do a drawing or a pattern one ourselves. It is just a shout out to get a drawing or file to make it easier for us.
In the meantime I located my old bike and the owner is capable and willing to make a drawing of the one I used many years ago.

Hi @Dvsrd,
I am aware of the XS sliders. We tried them many years ago. The length of them is the problem. Under hard brakeing they hit the bottom yoke. So not really a solution.
The 38mm doesn't fit in the rules for the class the bike is in. Maximum 36mm ones allowed.
I know that the mounting lug can be relocated per welding a new one on. A friend will use one for a street used caferacer also. The registration rules in Germany are that strict that no welding is allowed on structural devices. It is difficult enough to get an adapter through it.. But for that we have someone who is certified for to do the calculations and we have a certified shop who could machin such an adapter. It is a bit more difficult here to get a modified bike on the street than in the States.
But thanks for your input
Gruß

@manicmechanic
Richard,
not quite right. In Germany the 1976 RD400C came with cast wheels as standard. The spoke wheels were a higher priced option. On the other hand the RD250C came with spoke wheels as standard and cast wheels were a higher priced option. God knows why it was that way as it was.
From 1977 on all RD's had cast wheels as standard.
In the UK the 1976 RD250C model came with spoke wheels as standard but a drum rear brake instead of the disk.
The RD250 from 1976 on was never sold in the USA
Regards Uwe

Hi,
a few years back I had a RD400 with a 297mm TZ brake disc. So there was an adapter for the use of the genuine RD caliper installed. Sadly the bike is long gone.
So my question is. Has anybody a drawing or a STL-file of such an adapter plate?
I would like to build a bike with such a combo.
Regards Uwe

Mark,
that is really a sweet bike. Sadly we never got them in Germany.
Regards Uwe

Great story. I love it
Regards Uwe

World champions Todd Ellis/Emmanuelle Clement will have their first TT also. So could be quite interesting.
I am a bit sidecar biased as my daughter is deeply in there as a passenger which culminated in a World Championship campaign in 2018. Sadly after 3 meetings money dried up. Now she is racing in our clubsport series and sometimes helping out in other series.

@SoCal250
In my opinion he got the best available passenger. Let's see if they harmonize.
The only question mark is that Kevin Rousseau has not much experience at the TT, it will be his 2nd time there.
I am curious if Ben Birchall will do a World Championship season also. But then he needs another passenger as Kevin is racing there with Harry Payne. But the World Championship is not confirmed anyway. The promoter gave back his rights. So the FIM will do 3 rounds of the championship themselves and for further 3 rounds they are in negotiations with the old promoter to work something out. But it looks not good for the WC.
Regards Uwe

Another cool feature is what appears to be an adjustable swingarm pivot.

Hawaii-Mike,
the genuine Bakker frames had this feature up to 1976. I have a genuine Bakker TZ with this adjustable pivot also. Their first cantilever frames in 1976 still had these pivots but through that year they changed it to "normal" configuration.

Early twinshock Spondon TZ frames had this also. Not sure if that feature was an improvement or not. I read different stories.
Regards Uwe