ADVrider

Go Back   ADVrider > Bikes > Old's Cool
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-05-2013, 09:13 AM   #1
meijer's trails OP
Gnarly Adventurer
 
meijer's trails's Avatar
 
Joined: Jun 2008
Location: S.E. Michigan
Oddometer: 461
how do i select a carb for a 1980 dr400?

i was wondering how does one select a carburettor for a 4 stroke engine?

so my buddy has a dr400 1980 with no carb. im thinking of using a dr350 carb just because theyre plentiful.

but what would the experts, you guys do?

i remember seeing something about carb selection having to do with intake bore and displacement

thanks
jason
meijer's trails is offline   Reply With Quote
Old 07-05-2013, 06:51 PM   #2
qkenf4u
Gnarly Adventurer
 
Joined: Jul 2009
Location: nice warm bike riding COTTONWOOD ARIZONA...
Oddometer: 201
find a carb that matches the bore size of a 1980 DR400 (32,34,36,38mm ??)
then if youre really lucky it will be the same O.D. intake boot/airbox boot..

you could try the 350 carb .. might have to play with jetting a little but maybe it will work perfect. def. worth a try..
qkenf4u is offline   Reply With Quote
Old 07-05-2013, 11:45 PM   #3
eric123
Gott Mit Uns
 
eric123's Avatar
 
Joined: Mar 2009
Location: Idaho
Oddometer: 1,464
Use a carb off a GN400, it is the same motor...
eric123 is offline   Reply With Quote
Old 07-06-2013, 09:03 AM   #4
Duck_Pilot
Retired Roadracer
 
Joined: Jun 2007
Location: Denver 'Burbs, Colorado, USA.
Oddometer: 5,042
http://www.motorcyclespecs.co.za/mod...r400s%2080.htm

This site says it's a 33 Mikuni, but does not specify type (slide-throttle/CV). The difference is a big one here. Since the DR was off-road only, I'd presume a slide-throttle - much better flow. Because both the GN and SP versions of that motor were street-legal, I'm certain they used the Mikuni CV, and in a bigger bore.


http://www.suzukipartshouse.com/oemp...6ea/carburetor

This site proves my suspicions...... it's a Mikuni slide-throttle. Here's the parts breakdown for ya. Junk-yard one, and jet to suit yer altitude.

Yer welcome.
__________________
" A man that can have patience, can have what he will." - Benjamin Franklin

"Man cannot imagine how life could be more difficult or complex. But Congress can." - Cullen Hightower

Honestly, I *do* like Socialists. They just need a little tartar sauce.
Duck_Pilot is offline   Reply With Quote
Old 07-07-2013, 06:15 AM   #5
meijer's trails OP
Gnarly Adventurer
 
meijer's trails's Avatar
 
Joined: Jun 2008
Location: S.E. Michigan
Oddometer: 461
thanks duck!
meijer's trails is offline   Reply With Quote
Old 07-07-2013, 11:46 AM   #6
Duck_Pilot
Retired Roadracer
 
Joined: Jun 2007
Location: Denver 'Burbs, Colorado, USA.
Oddometer: 5,042
Yer most welcome.

Looks like OEM uses a twin cable push/pull setup with that bellcrank carb. If using the OEM airbox setup, you'll most likely need to copy that stuff. Using a 2-stroke type single-cable carb should work just fine, if the body is long enough to reach the airbox. That parts breakdown lists all the factory jetting, and at your altitude, that's gonna be the best place to start.

Good luck.
__________________
" A man that can have patience, can have what he will." - Benjamin Franklin

"Man cannot imagine how life could be more difficult or complex. But Congress can." - Cullen Hightower

Honestly, I *do* like Socialists. They just need a little tartar sauce.
Duck_Pilot is offline   Reply With Quote
Old 10-09-2013, 12:31 PM   #7
Andyvh1959
Cheesehead Klompen
 
Andyvh1959's Avatar
 
Joined: Feb 2012
Location: Da frozen tundra, 1.5 mile west of Lambeau
Oddometer: 564
A Mikuni VM36 has the same inlet and outlet spigots as the stock carb on the GN400. But you'd need a new throttle cable with the 90 degree noodle on the top to fit the VM36.

But I think the VM36 may flow a bit too much air for the stock GN/SP/DR400 head. I am trying to jet a VM36 for my GN400 ice bike and it may just be too big of a carb. The SP400 used a VM33 carb as I think the DR400 did also.
__________________
When life throws you a curve,.....lean into it!
42+ year rider, 22+ year MSF Coach, Street, Dirt, Ice, ride em all!
Andyvh1959 is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 05:27 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014