DT125R ARCHIVE

Gav when i say there was a difference i mean bottom end. It seemed more torquey if you know what i mean. Slight increase in power but nothing to get excited about. Like the exhaust im a bit "gutted" ha ha that i didnt totally de-restrict the bike.

Yeah there were no restrictors as such just wadding type material. Obviously stock 'cos it was machine spot welded in. Original exhaust?????

As far as the carb goes.... i kept breaking down when i first bought her...i stripped the tank n carb and found sh!t loads of rust n sediment in the chamber and tank. I cleaned all the bowl, jets, and lines then. Also fitted an inline filter for peace of mind. Maybe ill have to adjust the level eh.

This wont be revving problem you think gav??

This is bugging me now!

Good idea gav mate. But i tried that after the rebuild. 

Thought it may be a starvation problem

94 ???

Should be pipe section dia' restrictor, not 2 crescent shapes ??

http://dtr125.net/tuningf.htm

Unless you have a later 04 on pipe fitted ?? [would it fit ??] with the re circulate pipe welded over, but the cat' convert still stuck in the fat part of the expanny up front ?

Hi im new to the forum, i just thought i would share my knowledge and experiences on the whole derestriction thing. Ive owned 3 dt 125s over the past few years. My first one was an E- reg dt 125 lc mk3 (with the round barrel, and power valve) Totally differnt engine to the current models. I fitted aftermarket expanny and dep end can, rebuilt engine and just pinned the powervalve open. This was then good for 85+, and revved off the clock with no further mods. 2nd DT was a 1991 model, which i just fitted dep front pipe, big one rear, and pegged open powervalve, and then it was just as quick as the last one! Sold the bike a few years ago, and this weekend i bought a 2001 dt, which already had dep front and rear, and had the electronic servo kit for the power valve. Took off down the road, and i was so disapointed :(, was so flat, no power band, and struggled to hit 8000rpm.. went home disconnected servo and opened up powervalve, and it was still just as slow, then i read up about the reed switch in the speedo, it says on here just to put it to one side and 'do not disconnect!'. Took it for a spin, it was better, but still not great.. Well i thought b******s 2 it, I got out the continuity tester, tested between the 2 points on the reed switch and its normally open circuit! so i just followed the wires back, and disconnected them. Because The 2 contacts on the read switch are so close 2getha, its easy for the current to jump accross and make the circuit, which in turn restricts the spark, so its defo a good idea to cut it out alltogetha. Took it for a spin, and that totally transformed the bike, front wheel pops up in 1st and 2nd it now revs all the way up to the red, and is just as quick, if not quicker than my old dt's. Sorry for babbling on, hope this is of some help to ppl;

Deeyjay I have an 01 and its as flat as f u c k like yours was, I pulled the reed bloke out of the speedo and it made no difference I then bought a full after market exhaust and it made the bike better through the gears but still only done 63 mph. I think ill try what you done with the reeed and at some point pin the PV open.