Clutch
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Is the clutch basket worn with grooves in it? This would increase drag, and let the idle speed go down as the engine struggles a bit. If so they can be filed down untill smooth.
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@Jens-Eskildsen I think the first post mentions it's a brand new clutch.
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@Calum this is the order I put them in it lined the arrow on the pressure plate up with the dot on the clutch basket and I pushed the arm ( what the clutch cable connects to) to the front of the bike and turned the rod at the pressure plate end till the marks on the arm and crankcase lined up
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@Mightyman just new friction plates and metal plates and springs not the basket this is the clutch i got
http://m.ebay.co.uk/itm/EBC-DRC-COMPLETE-CLUTCH-KIT-FITS-YAMAHA-DT-125-X-2005-2006-/131742599793?nav=SEARCH -
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It COULD have been triggered by you changing the gear oil.
EDIT:
Or possibly the old plates had already worn enough to somehow make the issue less prominent... Why did you change the clutch in the first place? Could you give the old bits a try just to confirm it's not the assembly that's incorrect? -
@Ricky That's also consistent with a notched basket if I'm not mistaken.. Maybe your issue the whole time hasn't been the plates, but rather the basket. If the notches aren't too deep, try to file them down and see if it performs any better.
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It not going into gear could be a variety of things. Worn selector forks, bearings, clutch assembly, clutch springs.
Sounds to me like the clutch isn't disengaging.
Again what I said earlier will tell you it is clutch disengagement problem.
Never heard of a worn basket on a dt before though. Maybe if it ran with no oil. My brother ran his dt gearbox on coolant and oil with no problems. So they are pretty well engineered.