Cm250 clutch slipping

It is slipping. These big yamahas normally have slipping clutches. Mine slips, I've just learned to baby the clutch. Make sure you are in the most comfortable gear for the speed you are running at. Avoid rolling on full power at low speeds in higher gears. It's the nature of these great beasts. Clutch springs are too weak in these bikes, you may consider an aftermarket clutch spring assembly. The "shudder"(intermittent slipping) is caused by glazing. Make sure you are using the right lubricants for your bike, some synthetics can cause problems.

1)Adjust clutch cable correctly, check
2)Pull the clutch assembly apart, if there is little wear then you have "glazed" plates, clean each plate with 600 grit sandpaper and reassemble...get a new clutch spring assembly (weakened spring causes "shudder", slippage, and consequently glazing). Reassemble and adjust correctly (many forums out there with info).
3)Replace the full assembly and adjust correctly at setup. Adjust regularly....I check adjustment about every 300-500 miles.
4)Pay a shop to do these things for you.

when you replaced clutch plates did it compress up when you fitted the end plate with springs , also did you soak the fiber plates for a couple of hrs before fitting ! on the end clutch plate is there a centre nut and screw that you can adjust the free play and did you reset this ?

You need to replace the clutch plates. Once they start to slip you won't be able to readjust them with any success. Take a good look at both fiber clutch plates and the metal ones. You can replace just the fiber plates and it most likely won't slip anymore, but if you replace both fiber and metal plates it will last much longer. If you are on a budget and want to temporary repair it you can add washers to the clutch springs to add tension. Use spark plug washers, they fit perfect. I've done this on a couple of motorcycles with good results. But i do recommend replacing the clutch plates as i stated above.

always a good idea to change the springs as well.semi synthetic oil is recommended as fully synthetic can cause clutch slip on some bikes.good luck

check the clutch linkage and make sure it'd not binding and di you replace the pressure plate? if not then it will need to be replace to stop the slipping if the linkage is not sticking or jamming. If the pressure plate springs are broke it would cause it to slip, also if the master cylinder is not releasing this could cause it to slip.

You need a new clutch again. Sorry to give ya the bad news. This time make sure they put a new transmission seal in so fluid can not leak onto the clutch plate and ruin it.

Yes that what I am thinking that happened.
The clutch fiber plates and springs will need to be replaced.

it is the clutch plates they need to be replaced

Clutch plates are probably toasted. Drain the oil, remove the cover where the clutch cable goes into and check them out. Not hard to replace but you do need a special tool to get the plates off/on.

Old fluid or improper type. Doesn't the Sporty use the SportTrans fluid in the year? Other than that, maybe time for new clutch plates. Or the clutch spring may have lost it's spring.