White Brothers DR400T

[ola_martin]

Nope, got them this weekend from the guy I think photographed it on the Swedish 4st cup in the 80's. Know nothing more, sorry.

[cloggy]

 Nice pic,  there's a regularly raced XT engined single shock RM in the UK. 500SP/DR engines are just beginning to creep into the UK. We never got them back in the day, recession.

[SON]

Without a doubt the "Old" 400 engine is so much better than the 500 that replaced it,
I am still trying to find what happened to the Full Floater one off,

[cloggy]

 The newer engine had a reputation for toughness and an unsurpassed low down grunt, but it's a very big lump and looks heavy. The old engine outperformed the XT when taken out to something near the same capacity. With mods taking it to 52bhp for roadracing, 40bhp  with a wide power band should be achievable for motocross
http://ozvmx.com/community/index.php?topic=4582.15

[Marc.com]

This bike is still racing in Japan, has RN400 tank and some other cool bits

[crs-and-rms]

nice looking bike do you have any more pics of it

[GT43]

This bike is still racing in Japan, has RN400 tank and some other cool bits

I thought it looked cool as well.
Nice to know its still kicking.Cheers Marc.
To see recent pics of the bike would be interesting.

To make one of these today, I guess it would be a matter of slotting a DR500 engine in a 84' RM250/125 chassis.
The problem though is the "RN" tank? A fabricator would have to make it I think. $$$.

Suzuki should have made this the DR600 back then, it probably would have been a better option to the TT600 or the XR500/600.

[GT43]

[TT5 Matt]

i had forgotten about that rm/sr500 thumper,shame theres not more detailed pics of the frame mods thats been done.

[cloggy]

 In terms of UK racing it's next generation ie EVO 4 valves, balancer, single shock.
The DR400 is late 70s technology, would race in twinshock over here. It's a much looser formula than OZ, people convert single shockers to go twinshock racing.

[GT43]

nice looking bike do you have any more pics of it

Sorry, that was the only pic I had unfortunately.

In terms of UK racing it's next generation ie EVO 4 valves, balancer, single shock.
The DR400 is late 70s technology, would race in twinshock over here. It's a much looser formula than OZ, people convert single shockers to go twinshock racing.

Interesting classes there Clogg.
I like sound of the EVO 4 valve.
But not sure about the conversion of Single shock to Twin shock, whether its a good thing or not.
I guess it may add interest with a larger variety of bikes to play with.
But rare bikes could be ruined in the process, if people dont know what they are doing.

[Marc.com]

Heres TT motor in RM400 frame, nice fit and looks cool



Heres what was advertised as a "professional conversion" to RM frame, bought a lump to my throat

[cloggy]

 Evo is just up to 89 single shock
 A friend is making a Rotax KTM into twinshock for a customer, and folks are making twinshock frames for 83 maico engines, altering C&J Honda frames back to twinshock, even wrapping Curtis frames round a XR400. If anyone actually won on the latter there would be grumbling. As long as you are not up the sharp end nobody minds much: well actually the C&J are at the sharp end but there's very little to modify on that set up to take it back.  It's got so that CCMs and mid/late 70s bikes are having classes just for themselves.

[GT43]

Sounds cool Clogg, love to go over their one day and check the scene out.
I bet Shock companies and Fabricators/Engineers are doing well in the UK.




Marc
Yes that TT engine fits nice and snug in the RM400. Sweet.
TT500 engine looks more compact than the DR500.

[oldfart]

Best frame to use as a starting point is the SP 400 in my opinion, due to the fact they are lighter and are narrow enough to allow a better choice of tanks at the tank seat intersecting points. From there you can  create a new rear shock point / or graft on a new rear frame section..... ie    TM tanked  RMH