White Brothers DR400T

[DR500]

Old fart done a nice job on the one he has. I'm sure he's got plenty of pictures.
Stew and I have had a few battles out on the track with the DR's.

[oldfart]

Tony , it's getting a face lift over xmas along with a top end inspection.
I enjoy riding the DR 400 as it has brilliant front brakes, back brakes are hardly used  due to engine compression. Seems to corner well and you can get on the power mid corner with out it getting out of shake ... Yes I know there are a few pics of me laying down having a rest  -;D
Yes Tony  we have had some good races over the years  

[GT43]

Not sure if I should have started a new thread, but here's some more old articles pics.









If somebody were to race this bike today in VMX, what class would it come under?
Pre 85 Open ?

[GT43]

[SON]

GT 43 thanks for posting the CS420 story I remember the bike, just completely forgot about it.

[GT43]

Cheers "SON", its my pleasure.
It certainly looked to be a potent engine for an ole 4 banger.

[aehunger]

Hi Chaps,
im reading the clymer manual and I believe my DR400 has a VM33SS carb fitted. What is the correct setting for the slide needle on this model carb? Presently the needle circlip sit second from bottom position.

[SON]

What is your frame number??

[aehunger]

DR400 106577 Dude from Suzuki NZ said it was DR400ST

[cloggy]

6G1-3 for both the ST and the T; so I guess that's the middle position. That's with everything standard mind.
Main jet 122.5
Main air jet 1.0
Needle jet P-2
Pilot jet 15
Bypass1.0
Pilot outlet 0.8
Air screw one and a half turns out
Pilot screw ditto

[aehunger]

Thanks for the info,
As my stock carb has a broken jet ive got a Mikuni 36mm carb with the cam type throttle. Ive fitted this and the bike runs but misses in the mid range would i use the same jetting and needle position for this slightly larger carb? Also the choke does not seems to function properly in fact i had to rig up a hose that allows me to blow fuel directly into the airbox mesh screen to get the bike to start. Can you suggest what could be defective with this choke ive tested it in a bowl of fuel and the brass stem is not blocked.

[SON]

Aehunger, firstly have you access to a set of left hand drill bits and a reversible cordless drill with adjustable torque settings???
 go back to the standard carb, in open air spray the broken jet with aero guard
(you guys have that insect repellant )
Leave it for 2 minutes then try to extract the broken jet by drilling in reverse, in a low torque setting,
Start fine and work your way up in sizes, as it gets close to the thread size it usually winds the jet out.
flush it with the aero guard after each attempt.

[TT5 Matt]

and if you dont have a set of left hand drills then sharpen your right hand drill so they cut when going backwards

[cloggy]

And don't even bother wondering if the standard settings will work on a different carb. It's about as likely as swapping car doors between different models of cars.
 Also, if you do any more than take out the snorkel from inside the airbox, the standard carb won't work. Mine stopped performing as soon as I cut the restriction out of the inlet trumpet.  On the DR400 there is no point cutting holes in the airbox.
The air enters the filter on the inside of the filter and then runs into the airbox. If you cut holes in the airbox you are completely bypassing the filter, not clever.
 

[Marc.com]

Also, if you do any more than take out the snorkel from inside the airbox, the standard carb won't work.
 

The DR400 T and DR400S air box inlets are different with the S having a rubber boot restricting it. The standard carb I would throw straight in the bin, plenty of FCR carbs off modern MXers second hand on fleabay that will give you another 5 instant hp and better running.