DT125R ARCHIVE

rob patton · DTR Respected Member

39mm carb jetting

ToySoldier · DTR Legend

carb will be to big mate might wanna look into geting a 34/36mm off ebay a mikui one is only 60 new and btw you might wanna post in the noob section saying hello and indruciing your self a bit XD

the only way is YAMAHA DTR · Guru

im afraid nobody can tell you what size is needed, it takes some time to get it perfect. i drilled my main jet until it ran perfect and did a plug chop, standard main jet was 240 mikuni size(about 1.4mm) kept drilling it upto 1.6mm and that was just for cutting the top off the airbox, so might give u an idea.

the only way is YAMAHA DTR · Guru

the only way is YAMAHA DTR wrote:
im afraid nobody can tell you what size is needed, it takes some time to get it perfect. i drilled my main jet until it ran perfect and did a plug chop, standard main jet was 240 mikuni size(about 1.4mm) kept drilling it upto 1.6mm and that was just for cutting the top off the airbox, so might give u an idea.

Also mine has the flat side 28mm carb

rob patton · DTR Respected Member

i have seen people fit a 38 mm so dint think a 39mm would make much difference ?????

rob patton · DTR Respected Member

also i bet it sounds sweet with the top of the air box choped off ???

the only way is YAMAHA DTR · Guru

yes sounds like a yz250 , but hard to hear the sound on video so cant show you.

http://dt125r.activeboard.com/t42539245/airbox-top-cut-off/

rob patton · DTR Respected Member

ToySoldier wrote:
carb will be to big mate might wanna look into geting a 34/36mm off ebay a mikui one is only 60 new and btw you might wanna post in the noob section saying hello and indruciing your self a bit XD

is it to big due to fitting into the inlet or just that the engine could not cope with a 39mm carb i have seen 38mm on a dt ????

rob patton · DTR Respected Member

the only way is YAMAHA DTR wrote:
yes sounds like a yz250 , but hard to hear the sound on video so cant show you.
http://dt125r.activeboard.com/t42539245/airbox-top-cut-off/

you not going to chop ya end can ???

ToySoldier · DTR Legend

i think cr250s and ktm 300exc have like 39 or 40mm carbs so puting it in a dt ull need a small jet so its pointless

the only way is YAMAHA DTR · Guru

rob patton wrote:
the only way is YAMAHA DTR wrote:
yes sounds like a yz250 , but hard to hear the sound on video so cant show you.
http://dt125r.activeboard.com/t42539245/airbox-top-cut-off/
you not going to chop ya end can ???

no i changed the baffle inside to make it louder lol

-- Edited by the only way is YAMAHA DTR on Saturday 28th of May 2011 02:50:43 PM

rob patton · DTR Respected Member

what makes a flat side carb better than a normal carb ????

the only way is YAMAHA DTR · Guru

not too sure just better response apparently and is more racey

NathanDavies · Guru

keihin 39mm is an fcr pumper carb for a 4 stroke, you cant fit em

rob patton · DTR Respected Member

most me m8s with rx or rs has but a 38mm on and 1 with a 40mm they sound sweet as !!! and pull real well i know a dt will never match the speed but no harm trying haha