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Honda CB 250 RS Clutch issue dragging I think

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CMXCol:
Hi all

I have a problem with the clutch I think it is the clutch
Symptoms are
A gear grind going into 2nd or first from neutral I can 'force it in but I don't want to do that in case it causes damage to gears.
Engine revs markedly drop when clutch is applied.

What I have tried

Changing the springs
Changing the friction plates
Steel clutch plates are flat as an accurate stright edge no warp
Clutch is correctly assembled

I have tried two differnet clutches the original and the replacmenet which was a second hand spare.
Both baskets had some grooving on the basket faces but not too bad so I gently cleaned slight burrs off.

I suppose it is possible both baskets were bad?
Oil is correct 10/40
Oil level is correct.
Clutch is assembled correctly as per Haynes manual.
I have tried adjusting the cable up and down

I am stumped any ideas what else it could be?
Is it possibly a gearbox issue?
Any ideas or if anyone has seen this behaviour before appreciated!
It's a head scratcher indeed?

McCabe-Thiele (Ted):
My first thought is are you sure the clutch cable is in good condition & routed correctly?

CMXCol:
New cable it moves freely so not that but thanks

Laverda Dave:
Is the clutch operating mechanism correctly assembled in the clutch side cover with the spring the correct way around and not broken?
Have you compared the new cable with the old one to check inner and outer cable lengths are the same and did you have this issue with the old cable fitted?
If you have tried two clutches and the problem is the same I would guess it is something in the gear selector mechanism, pretty easy to check on these.

McCabe-Thiele (Ted):
 You have probably tried this but worth mentioning.

Assuming you have a center stand, with the engine at idle or just above, , have you tried engaging first gear, as there is now little  load on the wheel it should not cause any damage. As the rear wheel rotates, put on the rear brake with the clutch lever pulled fully in.

If the engine stalls on braking or the rpm drops significantly this should mean the clutch is not fully disengaging.

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