...has blown up?  I'm usually in the YZ forum but today my DR is giving me $h!t.  Getting her ready for another DOT inspection, checking the chain, tires, bearings, getting water completely out of the oil...    etc and during the test ride it suddenly won't come off mid-range RPMs for a few seconds.  The mechanic at the bike shop suggested to clean my jets really well since there wasn't an intake leak post-carb, so I took the carb out, punched every little hole in that sucker and shined her up with some carb cleaner, even checked the diaphram and lubed the throttle plate, reinstalled making sure all the vaccume hoses and whatnot were all in the same spot they were last year... fired up and same issue.  Idle is pretty weak and if it doesn't bog and die coming off of 1/8 throttle it will hold whatever RPM it revs to until:  Mid-Range- Wait a few seconds for it to calm its ass down  High-Range- "Blip" the killswitch.  Misted a bit of starting flid into the open airbox to see if it would pick it up, and it just started shooting out black puffs of smoke with little effect on the engine.  I'm usually a 2-stroke guy so I'm sorry to be bugging you guys on the DR forum out of nowhere, but this has me pretty stumped.  Could this still be a carb issue or should I inspect those valves and rings?  Any help would be greatly appreciated, I can add pictures if need be.  Thanks!
   - Chris

So with wot, it's getting stuck at mid rpm? Sounds like something is prohibiting it. Try a new spark plug, and check the valve gap. You may have to rejet depending on ambient temp, I know I had to with a 20 degree temp change.

So it gets "stuck" as in it won't go past? Or as in it stays at that Rpm and doesn't rev down?

Sorry guys I've been slammed with work.  Jhawins nailed it the second time, it won't rev down for quite some time.  Cav1er, is there any info on how to adjust valves/tolerance for these 125's?  They're pretty rare from what I can tell.

I have a service manual for the dr125se, so any q's, feel free to ask!

Valve clearance (when cold)
In&ex: 0.08-0.13mm (0.003-0.005 in)

If it wont rev down, my first thought would be a sticky diaphragm.

Try to control the engine rpms using the carb only- don't touch the hand control.

Edited by Cav1er, 31 May 2012 - 06:23 PM.

Outstanding!  I don't mean to be an ass or keep bumping but this is the first time I've had a chance to sit down and hop on the forums.  I'll check the diaphragm, and that's an outstanding resource Cav1er, if I need any more hard facts I know who to pester.