I'm looking to mount some LED turn signals on my GSXR 750 from 2001 but I'm not sure what would be good to get in terms of brightness, I've previously ordered some from ebay but they we're really weak in terms of brightness and not something I'd be comfortable to ride with. Anyone who could recommend some?

I'm not sure there are any particular brands for your bike, just generic retro fits.

Most LEDs are pretty bright but also pretty directional. Are you sure the old ones were getting good voltage to them?

I would try some other ebay supplier and just hook it up directly to the battery to check the brightness before you install them. I've bought a few sets of ebay signals for other bikes and have not had any issues besides the normal slow flash which is easy to fix with a resistor.

I'll have a look on the voltages thx :-) I know my friend bought a brand new Kawasaki Z900 and he faced similar problems with a pair he bought on ebay. I know he installed a Turn signal relay for the LED's before mounting the ones from Ebay can this be the cause of the LED's being dimmer?

It shouldn't be.

LEDs draw a lot less current than incandescent bulbs so the flasher unit blinks very slowly or not at all.

The relays are just a higher tech way of flashing the lights if I understand them.