Yamaha G1


New Member
Can someone exlpain the purpose of the butterfly in the exhaust manifold of a Yamaha G1 two stroke. I suspect it might effect the oil pump, as it uses exhaust pressure to regulate oil volume. I have been told to remove it for better porformance. I need to know why it is there and what might happen if I remove it. Mine has broken and worn linkage. Should I repair it or just remove it?
Thanks, in advance, Jeff