I have rgv 250 n ive put some 6 pot tokico,s on with standard master cyl brakes good but feels not right but will a radial master cyl of a r6 o8 be mutch better has anybody done this feels like the wrong master cyl can u help ta ernie.

It's possible that the brake system is not thoroughly bled. It can take a lot of work to completely bleed a system after it's been disassembled. I would recommend re-bleeding, making sure to bleed at all the banjo bolts (for each banjo bolt, pump and hold the lever, crack the bolt open 1/4 turn, and then retorque while holding the lever down -- repeat for each banjo). You can also tap the calipers, lines, and master cylinder with a rubber mallet or screwdriver handle while bleeding. If you have access to a pressure bleeder, I would recommend using it, as this will do the job faster.

However, it's also possible your master cylinder is not a proper match for your calipers. Different master cylinders have various bore diameters and stroke lengths which affect feel and performance.

I'm sure it goes without saying that your brakes are a critical component of your bike. Making modifications you are unsure of can lead to life threatening failures. I would not recommend swapping brake components unless you are sure that the components you are installing are compatible with each other and your bike.