Clutch
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@Ricky Well if it's original internals then it could be knocking, which will mean it'll need a rebuild.
if it's been rebuilt then it could be that it hasn't been assembled properly, and the engine hasn't been timed up properly. But the vibration when the engine isn't timed up is really bad!
Always Originate, Never Pirate!
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Go back in and check the torque on the nuts, is it noisy? like a continuous ticking sound? Clutch plates are slipping if the revs are dying, Re-adjust the clutch action on the clutch itself.
Mine did this once, but vibration suggests bearing, or loose plates, which seems unlikely.
Keep it real
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A video as promised please ignore the tapping lol
https://youtu.be/BdgV44NU6D8 -
So what's the tapping?
The fact the idle goes down with the clutch in doesn't really bother me. I see that a lot, usually the thrust bearings going on the clutch, however we don't have those.
What we do have is a primary drive bearing, which if it's on its way out, will vibrate and probably cause this sort of issue.
With that sort of mileage on a two stroke, and an uncertainty of the engines age, I'd be stripping it down for a rebuild...
I don't think we're going to diagnose it really.
If it isn't what I've been suggesting then I really think it might just be an engine rebuild jobby, or paranoia.
If it was really bad then you would know. Again it all comes back to how much vibration. If it's a lot, then it's for a reason. But two strokes rattle a lot anyway so it's really hard to tell.
Always Originate, Never Pirate!
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From that video alone, I really can't hear anything wrong with it. Definitely could be a case of paranoia like Calum mentioned, just from knowing you've been fiddling around inside the engine. The revs dropping sounds as though it's only happening when you push it down into gear. From my experience this isn't all that uncommon with two strokes. My TDR currently does that and it's not something I'm concerned about. Although I have owned a couple of bikes that would simply cut out if you dropped them into gear without revving them quite a bit. They both had worn clutches though.. If you want serious reassurance, take it to a bike mechanic. Any decent mechanic who's worked with DTs before will be able to tell you if it's okay just by listening/taking a quick look.
TDR 125 - 2001
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@Mightyman Yeah if the dropping when it goes in gear then that's different.
Sounds like the clutch is engaging with the lever pulled in.
You could tell if you put the wheel a paddock stand and do it, if the wheel speeds uo then the clutch is engaging.
Always Originate, Never Pirate!
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My ktm exc developed a knocking /vibrating sound from the clutch side the knocking would vanish when the clutch lever was pulled in it turned out it just needed a new clutch basket damper cushion which fits between the clutch basket drive gear and the clutch basket... Can't remember if the dt 125 uses a similar set up its been a while since I've been inside that engine but could be worth looking in to! As for the revs dropping when in neutral both my dts done that to so don't think it's much to worry about.
