DT125R ARCHIVE

DTR NESTOR · DTR Senior Member

yz250 carb???

louisBOSS · DTR Senior Member

well id would have thought the yz350 manifold , or rub down the dt one , if its big enough

DTR NESTOR · DTR Senior Member

managed to get a yz250 carb of ebay so am guna try fitting it to the standard dt manifold so i can keep the autolube system.

dtrcruzer · DTR Senior Member

wount a 250 carb be to big for a 125?

-- Edited by dtrcruzer on Saturday 12th of February 2011 10:07:43 PM

DTR NESTOR · DTR Senior Member

its a 38mm carb and ive seen that a couple of people have alreay done it, but i just need help with the jetting when mine gets here.

im guessing its gone be a apsolute pig, i want to keep my standard airbox on it aswell.

A guy on here has done it but hes not online yet.

-- Edited by DTR NESTOR on Saturday 12th of February 2011 10:21:15 PM

-- Edited by DTR NESTOR on Saturday 12th of February 2011 10:21:34 PM

dtrcruzer · DTR Senior Member

yeah sorry read the other post wrong i thort it was on his other bike

Dickhead · Nonce

you have know idear how hard it was to get that to fit and conect to the airbox

xGINCATx · Guru

robin wrote:

you have know idear how hard it was to get that to fit and conect to the airbox

I can imagine, it's an absolute ballache just trying to fit the standard back in never mind one even bigger!!

DTR NESTOR · DTR Senior Member

so, it is possible? ive fitted a ****ty cone filter for now, i tihkn ill hjave a go at fitting the standard one back on.

Dingle001 · DTR Senior Member

I would recommend you do some serious work to the reed block, otherwise you wont get any improvement. The reason is that the cross sectional area of the 6 windows in the reed block is about the same as the standard 26mm carb, so it is the bottleneck of the induction system. So a bigger carb wont get any more airflow through those poxy little windows. Anyway, famous last words, im sure someone will prove me wrong......

Good luck with it!

DTR NESTOR · DTR Senior Member

28mm standard on mine mert. ye, guna try mi best, why the hell does the dt have such a ****ty small reed block anyway?

Dingle001 · DTR Senior Member

Sorry - you are right about the 28mm standard - I was getting confused with another engine.

How about this:
http://cgi.ebay.co.uk/yamaha-rd-selection-reed-blocks-rubbers-200-350cc-/150563115660?pt=UK_Motorcycle_Parts&hash=item230e42d28c

A selection of Yamaha reeds and reed blocks. Might find something that breaths a bit better than the standard DT??!!

DTR NESTOR · DTR Senior Member

HEY GUYS managed to fit the 39 onto the dt manifold, but omg it was sooooo hardddd!!!

180127_10150400303440165_684975164_17352920_6917410_n.jpg

plebpl · Guru

as previously stated, will you get any power gains if your keeping the same manifold, i cant see it letting much more air in

DTR NESTOR · DTR Senior Member

bored the hell out of it...
much wider than standard opened it all up...
Also did a bit of work on the reed block by enlarging the windows and cutting the point so air flows straight out, THANKS GRAHAM BELL!

-- Edited by DTR NESTOR on Thursday 17th of February 2011 09:26:19 PM

Dingle001 · DTR Senior Member

Nice one. Let us know what it goes like. Just be a bit cautious on the jetting as it will be jetted for a 250 and on a smaller engine it could run weaker. Yes, Graham Bell's book has got some good stuff in it. Just wish I had a rolling road to try out a few things. One on ebay at the moment .................hmmm