DT125R FORUM

Yesterday I did the compression test 110 psi.

@Darty, thank you ;), I drove the x number miles calm and not to high rpm. But my mate got a compression tester, maybe I should test this first ?

@Jens-Eskildsen, this afternoon I put back the mainjet 240, maxspeed is 60 mph and max revs 9500 RPM.
It's a little better, but not like it should be..

@Calum Thanks man ;) already did http://www.dt125r.co.uk/topic/354/loss-of-speed-and-revs :D

Hello guys,

So here is the story: I bought my Dt125r 2002, 2 years ago, it was driving fast, quick response to 75 mph and i could redline the RPM.
But it wasn't reliable, sometimes it bugged and acted strange.
Than I thought, let's put it back original. I removed the carb, cleaned it and replaced the main jet (280) to original (240) the rest on the carb was original.
I drove to work and on my way back it acted strange, it bogged and died..; (to lean) piston rings worn, so no compression.
The previous owner, drilled holes in the airbox and cut the whole top open. (way to much air + main jet 240 = to lean.
Took my Dt to the garage and the bored the cilinder out. :) it was alive again.
Now i fixed the airbox and putted a main jet 260 in it (scared to run lean again)
But after the rebore, the bike isn't that fast anymore, maxspeed is 56 mph and max revs 9000 RPM. :(

Does anybody know what to do or what can be the problem.
I would love that my DT could get his Speed and Revs back..

Thank you. (Sorry for my english)

@CYBER-NINJA Thanks ;)

@2stroketerror Thanks man ;) the only thing i think is that the original headlight is better, but i bought it like this so.. :) maybe change it later on.

Hello guys,

I'm Stef from Belgium and this is my Dt125r.
I repainted the exhaust and put some new dirtbike tires on, to go riding in the woods ;).
It's my first bike and I love it, sometimes it can be a pain in the ass, but I love it :D.

(I'm glad that I found a Dt forum that is alive)

http://i1044.photobucket.com/albums/b446/Stef_Mangelschots/IMG_20150407_143528_zps4y2qdqlj.jpg