DT125R ARCHIVE

CooS · DTR Senior Member

RE: top speed??

ToySoldier · DTR Legend

iv had it off the clocks so not sure but was following my amte on a gennise thou and i was off the cloacks he said his clocks wer saying 85 and i still had a bit of throal movement cos i dident want to crash into him XD

dirtpoor · DTR Senior Member

Restricion Is in the rev counter

CooS · DTR Senior Member

On the dt-re model it is a type of block connector with (I think, carnt remeber) 4 wires going in an only 3 wire coming out! You pull the wire that is doing nothing and earth it to any metal but make sure there isnt paint an it is metal e.g frame

-- Edited by CooS on Wednesday 14th of September 2011 09:59:30 PM

richie · DTR Respected Member

yeah all done today it was done at the garage but double checked today and all good and i have changed the jet to a 260 cant tell any difference at all and still only does 70 75 mph so how you guys are geting yours off the clock i dont know

Dickhead · Nonce

http://www.youtube.com/watch?v=vSGQZUPKxcc

CooS · DTR Senior Member

Lmfao I wish my dt was that fast *wink wink* haha

*Cough*250*Cough*

-- Edited by CooS on Thursday 15th of September 2011 12:10:55 PM

scottridgwaydtx · DTR Newbie

got a dt125x 07 with full arrow system went off the clock before the rebuild went past my friends corsa and he was doing 90 and still going

creamsodauk · DTR Respected Member

without up jetting with a new pipe you risk a probable lean seaze, most common issue with 2 strokes is modding for power and not allowing more fuel

like you say , the pipe allows the bike to perform better, theirs no restrictions anymore and no cat in the pipe, so more fuel is needed. I cant say what you need to up jet to, but a common guide is 10-15% increase (example is i just fitted a pipe to my aerox, i up jetted from a 76 to an 86 allowing just over the 10% bracket)

As for top speed etc. the dt full power probably only puts out 20bhp at the rear wheel, my rs is probably putting out 24bhp rear wheel with a 24mm carb and arrow chamber etc. The gp bikes put out around 45bhp but are completely useless under 8k revs lol

-- Edited by creamsodauk on Friday 20th of January 2012 09:41:52 PM

NEV · Guru

20bhp, with full power? I reckon thats debatable mate, I could have sworn i've read on a few articles regarding specs that it becomes around 30-33 when fully de-restricted from 14bhp as standard, and especially with the older engines, with the newer type to around 28bhp, fully de-restricted, 33bhp being roughly equal to the Aprilia 125 Rotax engine.

Oh and 33bhp, doesn't mean speeds of 100mph+ my xt600 has 45bhp and will only do 100mph top speed but fookin fast getting to it.

-- Edited by NEV on Friday 20th of January 2012 10:26:51 PM

-- Edited by NEV on Friday 20th of January 2012 10:30:40 PM

NEV · Guru

thats standard add a dep then up the revs, bit nearer 30 than 20bhp

http://www.motorcyclespecs.co.za/model/yamaha/yamaha_dt125r%2093.htm

plus 32mm mikuni, carbon reeds blah, blah blah

-- Edited by NEV on Friday 20th of January 2012 10:42:17 PM

ToySoldier · DTR Legend

dt's with full dep and a pv and no restrictions i rekon runs at 24-26 tops deristricting a dt should make it to about 20 then adding a dep and upjeting should ad around 4

creamsodauk · DTR Respected Member

These engines state 30bhp most places, at the fly wheel. In real world terms they put out around 20-22 rwhp.

a freind of mine has a rs125, ported and fitted with many race parts and its been dynoed at around 32bhp rear wheel

NEV · Guru

You mean the Aprilia rs125 with the rotax 23 engine?

As soon as mines run in I'm putting it on the dyno, I'll see then how many horses its got then.

NEV · Guru

NEV wrote:
thats standard add a dep then up the revs, bit nearer 30 than 20bhp

http://www.motorcyclespecs.co.za/model/yamaha/yamaha_dt125r%2093.htm

plus 32mm mikuni, carbon reeds blah, blah blah

-- Edited by NEV on Friday 20th of January 2012 10:42:17 PM

Oh and when I get round to it, I just need a choke cable conversion from the choke on the carb to handlebars, the boost bottle is ideal to tap into, you need the choke cable to richen up the fuel mix, as running NOS leans it right up, which is where most people go wrong. Be interesting to see how many horses this would add mind.

NORFE · DTR Trusted Engine Builder

is that one of them mini moto nos kits nev??? now that would be nice to see dyno runs b4 and after with the nos

ha

smile

NEV · Guru

Got it from the states a while back, me n lad were going to bang it on an old scoot we had but sold it before we got round to doing it, aye have seen it on those mini motos, and even those little scooters with the little chainsaw engines on them, by fook it makes a difference too, ideal for traffic light starts I suppose, nowt else. You tubes got a few of them on it.