Assuming you have enough fluid in the master cyl,you should be able to build pressure.I always use a vac pump to suck it through fast to minimise the chace of trapped air.Theres also the loop above the master cyl behind the kicker housing that can trap air if not using a vac pump.
If this fails,the piston and cup assembly,(yamaha part# 5un-w0042-50) is the rebuild kit you require if you cant find the GG oem kit.
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