01-02-20, 01:22 PM
SBS are the way to go front and rear, HS634 front, RQ570 rear.
If you split the caliper, which I'd only recommend in extreme cases. You'll need to replace the sealing washer, this isn't available from Yamaha, luckily the same seal from the Suzuki GS500 fits. Make sure you get all the oxidised material out of the main seal and dust seal rebates, any left in there will just start re-oxidising again and in a short time the piston will start to seize. Be very careful when removing the oxidisation if you scratch the surfaces too deeply it will accelerate water ingress and oxidisation and that you fit the main seal the correct way round.
If you split the caliper, which I'd only recommend in extreme cases. You'll need to replace the sealing washer, this isn't available from Yamaha, luckily the same seal from the Suzuki GS500 fits. Make sure you get all the oxidised material out of the main seal and dust seal rebates, any left in there will just start re-oxidising again and in a short time the piston will start to seize. Be very careful when removing the oxidisation if you scratch the surfaces too deeply it will accelerate water ingress and oxidisation and that you fit the main seal the correct way round.
Later