DT125R ARCHIVE

AndyYam · Guru

Years of restricted and full power CDI's

Cameron · Guru

Been looking into this, I'm pretty sure this is how it works:

89-96 CDI's are fully derstricted from new.

97-99 are restricted, some by a grey box which can be modified to give you full power (higher rev limiter). Some bikes like mine don't have that which means you're stuck with a restricted cdi, only way I see you can change that is by fitting a pre-96 cdi which is what I'm planning on doing. (if anyone knows what codes are on what years that'd be pretty helpful)

99-03 seem to mainly be restricted by the reed switch but apparently some also have restrictions in the cdi, says that you'd need to fit all the electrics from an older bike to change the cdi though.

04-07 CDI's can be derestricted very easily by earthing the green/black wire behind the speedo

Most of the info's I've found is from here:

http://www.scrimsmustangsclassicyamaharestorations.com/derestricting-the-yamaha-dt125r-1988-through-to-2007.html

HTH

AndyYam · Guru

Brilliant stuff if accurate PH, hopefully others can confirm this and someone can get the part numbers. I would guess you can use parts manuals to work it out? I'll do some research.

NEV · Guru

that 4HW I mistakingly bought as a 4DL is off a 95 bike, same shape as a 3mb one, same number of wires but couple are different colour code to the DT one have worked out which wire does what, again they do mainly same as DT, bar a couple which can possibly be left off.

NEV · Guru

The 92 4DL2 the one with the Rubber 'O' ring for the top of the barrel, Belgarda, gives it as having a 4dl cdi, 4DL-85540-00-00, the 4FL ones with the 4FU nicosil plated barrels, came with a 4FL-85540-00-00, reckon that last part must mean all the same. Actually the more I look into the different CDI's its more a case of finding out the countries that had their bikes restricted, as all have the last numbers the same, but for example, for the 4JB3 95 bike, the CDI for Austria, Finland, and Switzerland is 4HX-85540-00-00, the one for Greece and Portugal is 4JB-85540-00-00, and the one for UK is a 4HW-85540-00-00

-- Edited by NEV on Tuesday 28th of August 2012 10:42:56 PM

-- Edited by NEV on Tuesday 28th of August 2012 10:51:56 PM

GADGET · Guru

Ok so had a look at some tzr clocks ,10.500 for just tzr ,11.000 for 4dl

-- Edited by GADGET on Tuesday 28th of August 2012 11:10:43 PM

NEV · Guru

the only way is YAMAHA DTR wrote:
been looking at wr200 cdi's

What about Lanza ones too? they only differ on the CDI for the two years 97 4TP1 is 4TP-85540-00 and the 98 4TP2 is 4TP-85540-20 heads and barrels the same for both years.

-- Edited by NEV on Tuesday 28th of August 2012 11:55:45 PM

GADGET · Guru

Scrim,Could u not put the dt200wr servo on that setup as it would give THE ONLY WAY something to think over

-- Edited by GADGET on Wednesday 29th of August 2012 12:05:25 AM

NEV · Guru

92,93,94,95 WR 200's all had the same 4BF-85540-00 cdi, and the same 3XP head and barrels.

-- Edited by NEV on Wednesday 29th of August 2012 12:08:38 AM

GADGET · Guru

And ONLY WAY it mat work physically the same but with different stroke length could be different !th servo's work on a pulse signal and maybe at th rpm th dtwr needs th valve to move is different from dtr coz of more power anyway

-- Edited by GADGET on Wednesday 29th of August 2012 12:12:26 AM

GADGET · Guru

It's just dtwr has 6.3mm longer stroke so would be out compared to dtr servo ,even tho rpm is rpm the two would different cost the piston will be in a different place when th valve opened ,so even tho when open would work the piston is moving at a different speed

-- Edited by GADGET on Wednesday 29th of August 2012 12:38:41 AM

scrimsmustang · DTR Mechanic

4DL cdi has one less wire than an early type DTR cdi.

scrimsmustang · DTR Mechanic

3NC-85540-00-00 is the part number for the unrestricted 89 to 98 type cdi with built in YPVS controller no matter what year the bike is. As said some 97 and 98 cdi,s when the 3 wire servo was fitted standard on UK bikes seem a little bit reluctant to rev as free as the earlier type.

If you have a 99 2000 2001 with a cdi marked 3RM10 sling it it in the bin, ive never seen a 2002 2003 without a 3RM20 cdi on it yet though. These are about the best for the 99/2003 bikes.

NEV · Guru

Well sort of aye, as theres two black earths coming out of it into a single male bullet, bought one last week, just need to sort out that blue clutch wire, whether or not I need to earth it, or leave it, or what.

GADGET · Guru

Would I gain anything by changing my 3nc-00 1990 Cdi for a 4dl etc etc cheers guys

the only way is YAMAHA DTR · Guru

doubt that 2003 cdi's are restricted my bikes always reved out fully absolutly flies,

GADGET · Guru

Reckon uv got the 3rm-20 then

NEV · Guru

Mainly CDI'S off TZR's TOWIE as not only not restricted but faster and higher revving iirc, anyone know the redline on a TZR clock?

GADGET · Guru

Dunno but surly can't be much over 11k ? Good Q

NEV · Guru

Aye a tad more, the 2002/3 bike Towie had the bolted on CDI by the oil tank, not under the seat type was a 3RMM had 2 options for CDI, a 3RM-85540-20-00, and a 3RM -85540-30-00

the only way is YAMAHA DTR · Guru

what ones better i think mine sed 3rm 20 off the top of my head could be wrong

NEV · Guru

Of all the different countries with the same 2002 3RMM bikes all have the two options of the 3RM-20 3RM-30, Germany had two also but the 3RM-20, 3RM-10, and Spain just went with the 3RM-20, so aye Scrim, bin the 10, and go with the 20 but on the later models. cant remember the Spanish having to restrict owt there.

GADGET · Guru

As scrim said 3rm-20 is bout the best u can get for that year ,that's probs why urs is ok ,but if u were to retro fit all th leccys from an earlier bike u would have full power but u would need Cdi/flywheel/stator/loom/ignition/servo/reg-rec etc etc ,don't think u have to worrie with th new displacement lol

the only way is YAMAHA DTR · Guru

been looking at wr200 cdi's

GADGET · Guru

Get th code off toy ,but some have a yellow wire for th traction control ,although it Wunt matter on dtr coz it ain't got leccy clocks

scrimsmustang · DTR Mechanic

Yeah would do the job probably, if you used all the electrics from a DT200WR you would never need a battery again neither but still have proper lights, indicators etc all working properly. I had an 03 DT125R with an 88 3ET DT200R loom, cdi and pegged open powervalve it ran sweet.

the only way is YAMAHA DTR · Guru

well the lanza is quite more different than the wr200, see how she runs with my standard electrics

the only way is YAMAHA DTR · Guru

servo will works the same as on the 125, just turning a valve

GADGET · Guru

Wr200,s or dt200wr,s

NEV · Guru

wr200