Dt125r derestricting

Dt125r-ash · Derestricted Danger Joined: 13 Aug 2013 Karma :

Hey guys,

Just wondering if there are any 2stroke heads out there that can solve my problem Smile

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So I'm trying to derestrict my dt125r 2002 model, I'm not so good with bikes but my bro has allready done the following, he has moved the reed switch from inside the speedo clock and moved it further away and taped it up, he has cut the rubber nossle on the inlet manifold and he has removed the rubber air box nose from under the seat, when testing the bike out I noticed an increase in power but only a slight increase and not really a pull to my other 2stroke, and it does not want to go over 7-8k rpms and seems to bog out when shifting, the bike was fully restricted when purchased, 99% of the bike was standard apart from the powder coated wheels, any help would be greatly appreciated Smile

thanks. Ash

nightshaddow · Nearly there... Joined: 18 Feb 2008 Karma :

you need an after market exhaust and a de restricted cdi also, my next door neighbor has the same bike and also the same problems
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Current rides CB 125 TDE(the next project) NS125RK ( now on the road ) CB125TDC (soon to be project 17) melody ( the nephews )

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

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

_Iain_ · Banned Joined: 01 Feb 2012 Karma :

When you say you "cut the rubber nossle on the inlet manifold" what precisely did you cut off?

https://www.motorcyclespareparts.eu/special-pages/model.aspx?brand=4&type=13&year=350096&model=350122&part=350160
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Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

Dt125r-ash · Derestricted Danger Joined: 13 Aug 2013 Karma :

Sorry for the late reply guys, I'm gonna get a new exhaust and pipe for it and can you link me up with a cdi please, and Iain the exact same thing it says on the link what paddy sent. Thanks

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

_Iain_ · Banned Joined: 01 Feb 2012 Karma :

Ah, but if you think you've chopped the bit the paragraph describes & have actually caused a massive air leak by chopping a vaccum line or simmilar?

What part number on the diagram linked?
____________________
Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

Captain Liberious · Two Stroke Sniffer Joined: 23 Feb 2013 Karma :

In my opinion the standard exhausts are much better than aftermarket (once derestricted that is). There's a little washer held into the downpipe by 3 bits of weld, just get in there with an chisel or something and bash them off.
I bought a DEP downpipe for my old DT thinking it would be better, it gave the bike slightly better power at high revs (7000+) but completely destroyed the power at lower revs.
The standard exhaust gives better power at low revs, also the bike will start more easily with it on
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