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Old 08-27-2013, 04:41 AM   #1
klp OP
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DT400 carb choices

I just got a 78 in decent shape, 2500 miles with no carb. It's complete aside from that and the rear signals.

Ebay doesn't have a lot to offer and those that are there are pretty expensive. This is a cheap bike and I would like for it to stay that way!

I have seen others recommend this -

http://www.ebay.com/itm/KEIHIN-PJ34-...item232e6cc563

And also this -

https://www.denniskirk.com/_.p16465.prd


How much work would setting these up entail? The Mikuni looks almost exactly like the stocker, could I simply install stock size jets and be done with it?

Everybody loves pics...



I have the fenders and exhaust...
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Old 09-10-2013, 10:00 AM   #2
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After a metric shit ton of research and getting sniped on the only reasonably priced carb on ebay I'm leaning to the Mikuni in the second link. You can add a port for the oil injector and I'm hoping if I set it up with stock size jets it will get me close.
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Old 09-10-2013, 10:12 AM   #3
stainlesscycle
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stick with the vm. reliable, cheap, easy to get parts...
32/34/36 will all work i believe - depends on what you plan on doing - i dunno about adding the injector part - the oil pump is the very first thing i remove..
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Old 09-10-2013, 10:23 AM   #4
dhallilama
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Quote:
Originally Posted by klp View Post
After a metric shit ton of research and getting sniped on the only reasonably priced carb on ebay I'm leaning to the Mikuni in the second link. You can add a port for the oil injector and I'm hoping if I set it up with stock size jets it will get me close.

i'd go for a new carb 99% of the time over a used/original one.
get a new mikuni VM (like the one in the 2nd link), jet accordingly and ride happily.
get the VM, a few main jets & a few pilot jets and start tuning. if the standard main for the DT400 is a 160 (seem to remember that's what it was on the '77 i had), i'd get 145, 150, 155, 160, 165 & 170. same with whatever the pilot jet is... the standard size + 3 smaller and 2 larger. that should about have ya covered, depending on your elevation.

i know there's "better" carbs out now, lots of people love the $49 taiwan Keihin knock-off, flat slides, etc... but i've messed with the mikuni VM for ages, it's easy to tune, makes good enough power, etc.
stubborn, i am.
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Old 09-10-2013, 10:28 AM   #5
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Quote:
Originally Posted by dhallilama View Post
i'd go for a new carb 99% of the time over a used/original one.
get a new mikuni VM (like the one in the 2nd link), jet accordingly and ride happily.
get the VM, a few main jets & a few pilot jets and start tuning. if the standard main for the DT400 is a 160 (seem to remember that's what it was on the '77 i had), i'd get 145, 150, 155, 160, 165 & 170. same with whatever the pilot jet is... the standard size + 3 smaller and 2 larger. that should about have ya covered, depending on your elevation.

i know there's "better" carbs out now, lots of people love the $49 taiwan Keihin knock-off, flat slides, etc... but i've messed with the mikuni VM for ages, it's easy to tune, makes good enough power, etc.
stubborn, i am.
Mikuni jets go by 2 1/2 increments . 150,152.5,155,157.5 and so on.
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Old 09-10-2013, 10:33 AM   #6
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Yeah Stainless I'm not sold on the pump port either but want to have the option. I have an rd with one and it has been very reliable. I think premix on a streetbike will be a big PITA. This bike will do mostly street duty, maybe some light fire road stuff.
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Old 09-10-2013, 10:41 AM   #7
stainlesscycle
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if you're gonna ride more than 2 hours at a time, i think the oil pump makes things a heckuvalot easier..
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Old 09-10-2013, 10:45 AM   #8
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Originally Posted by joexr View Post
Mikuni jets go by 2 1/2 increments . 150,152.5,155,157.5 and so on.
not the large hex 4/042 main jets the VM 34 uses... at least none i've ever seen. not in the mikuni/sudco catalog either.
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Old 09-10-2013, 10:45 AM   #9
stainlesscycle
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Quote:
Originally Posted by dhallilama View Post
i know there's "better" carbs out now, lots of people love the $49 taiwan Keihin knock-off, flat slides, etc... but i've messed with the mikuni VM for ages, it's easy to tune, makes good enough power, etc.
i like the vm too - they ALWAYS idle.. lotsa carbs make more power, but the idle circuit on the vm is so predictable - it makes tuning so much easier when you're not fighting a bike to keep it running..
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Old 09-10-2013, 10:55 AM   #10
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OKO flat slide available from Ebay for $49, works much better than any round slide carb, and Keihin jets fit no problem. These carbs will greatly improve running, increase top end power, and in most cases reduce fuel consumption.
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Old 09-10-2013, 11:08 AM   #11
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Originally Posted by dhallilama View Post
not the large hex 4/042 main jets the VM 34 uses... at least none i've ever seen. not in the mikuni/sudco catalog either.
Right you are. I just looked it up on JetsRUs.
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Old 09-10-2013, 01:17 PM   #12
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Originally Posted by Twin-shocker View Post
OKO flat slide available from Ebay for $49, works much better than any round slide carb, and Keihin jets fit no problem. These carbs will greatly improve running, increase top end power, and in most cases reduce fuel consumption.
yes, but not vintage legal - if that's a factor..
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Old 09-10-2013, 03:54 PM   #13
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yes, but not vintage legal - if that's a factor..
I'm more concerned with drive-ability, ease of setup and fitment. Would a flat side radically change any of these things?

This one looks to already have a hole for the injection nozzle.

http://www.ebay.com/itm/YAMAHA-YZ-SU...12aa8b&vxp=mtr
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Old 09-10-2013, 04:50 PM   #14
stainlesscycle
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Quote:
Originally Posted by klp View Post
I'm more concerned with drive-ability, ease of setup and fitment. Would a flat side radically change any of these things?

This one looks to already have a hole for the injection nozzle.

http://www.ebay.com/itm/YAMAHA-YZ-SU...12aa8b&vxp=mtr
tmx's suck. vm or if you gotta flat slide/d-slide, pwk/oko..

the vm's are the easiest. pwk/oko is not bad to tune, they make more power everywhere than the vm.. tmx is a nightmare.

if you're just riding it casually the vm is by far the easiest to deal with.
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Old 09-10-2013, 11:10 PM   #15
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Originally Posted by stainlesscycle View Post
tmx's suck. vm or if you gotta flat slide/d-slide, pwk/oko..

the vm's are the easiest. pwk/oko is not bad to tune, they make more power everywhere than the vm.. tmx is a nightmare.

if you're just riding it casually the vm is by far the easiest to deal with.
can't say i'm not beginning to be tempted by the pwk or oko. i have some kinda issue around the oko being a knock off, but that price tag is forgiving.

that being said, VMs sure are easy and i can't say the carb is why i've lost so many races
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