DERESTRICTING GUIDE

[NINJA]

Hi All -

Just thought I start a thread with a guide on 'how to' derestrict your DTR/X. Here's a very good guide to start with, you may find it easier swapping the full exhaust with a DEP, Giannelli or similar instead of cuting up the front pipe. If you have any other tips or links then please chime in.

https://www.slideshare.net/kerryprinceuk/derestricting-the-yamaha-dt125-r-1988-through-to-2007-scrimsmustangs-classic-yamaha-restorations

https://www.youtube.com/watch?v=ILwFDQ8ew24

[Calum]

The RE/X has got to be by far the easiest to derestrict.

Earth Green/Black Wire, new pipe. It's like Yamaha knew we were going to get full power haha!

They were also packed with only 3MB heads and all the boost bottles.

Probably still the slowest nevertheless lol.

[Darty]

Available from Fowlers.

Yamaha DT230 Lanza Airbox duct. Really nice upgrade, much larger duct for more air intake. Jet slightly richer towards 3/4 Full throttle and this Duct will work very well.

A little material has to come away to seat it's larger flange, so be sure, and commit to jetting if needed.

Better sound there too.
DUCT
4TP-14437-00

https://c1.staticflickr.com/8/7546/29448640661_45bd65b4f9_c.jpg

https://c1.staticflickr.com/9/8148/29448617261_8296a8c346_c.jpg

Airbox Tract. 1988-98'

3MB-14453-00
The later Airboot YIES bottle was introduced for better low RPM induction and emissions. It works really well for the Midrange, but makes the bike a little flat on top.

For Top end, I use the older Airboot without YIES. It works better for higher RPM.

http://thumbs.picclick.com/00/s/MTAwMFg3NDY=/z/0OUAAOSwGIRXZ~WU/$/Yamaha-DT125-R-DTR125-AIRBOX-RUBBER-_1.jpg

[Irongamer727]

What does the black/green wire do?

[declan]

@irongamer727 it removes the restricted rev limiter on the bike

[NINJA]

@Calum I think this thread needs to be pinned, as it has a lot of useful info and tips.

[Calum]

@NINJA There are only 7 threads in this section loi. Pinned anyway.

[NINJA]

@Calum True but sadly people do not use the search bar, or look around various sections before posting.

[connorjordan185]

@declan is it green and black nomatter what year or model?

[Calum]

@connorjordan185 No! Have you even read @NINJA's link?

I quote

"DTRE AND DT125X 2004 ONWARD!"
AKA not previous.

[connorjordan185]

@Calum I have yes, all I need to know is how to electronicly de-restrict my 2002 plate dt125r it's doesn't quite say on there, my bike has about 6 wires coming from the back of the speedo

[NINJA]

@connorjordan185 Watch the video dude, it shows it all!!!

[connorjordan185]

@NINJA what video? I have tried a few on YouTube. I

[Calum]

@connorjordan185 Then you don't have the green and black wire, since that's for 04 onwards. Yours will be the reed switch, exhaust and CDI.

[NINJA]

@connorjordan185 The link is in my first post.

[connorjordan185]

@NINJA thanks mate, I have had the bike in bits once again, I've been through the wiring the lot and as far as I can tell it all looks good, the little white block thing is popped out and wrapped up but still tucked inside the speedo unit, so this is leading me to think the fault lies elsewhere

[connorjordan185]

@Calum is the reed switch the little white block inside the speedo clocks? If so that's wrapped up inside the speedo unit, my bike has a full dep pipe. But you mentioned cdi unit, do you think this could be my problem?

[NINJA]

@connorjordan185 Yes that's it. :thumbs_up_medium-light_skin_tone:

[connorjordan185]

@NINJA what do you mean mate? The cdi is my problem?

[NINJA]

@connorjordan185 The white block is the reed block, which you have found. The CDI may be the problem as the later models have a built in rev limiter. Read the guide aka the paragraph which starts "The manin restriction", then check which CDI you have? Better yet take and post a pic for us all to see.