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Look at the back of the arm, on the inside edge near where the cain adjusters are welded on there is a small vent hole drilled into the arm. Clean the hole as it normally gets partially blocked with rust flakes. A small straw or something similar inserted in hole and jiggled whilst shaking the arm will allow the rust to drop out.
The CB500 swinging arm certainly has them and it's essentially the same arm.
I'll go other and wire brush it to see if it's there, why would they put it there and not at the lowest point to allow draining? Water will pool in the bottoms on those
Quote from: DomP on December 03, 2023, 05:58:20 PMI'll go other and wire brush it to see if it's there, why would they put it there and not at the lowest point to allow draining? Water will pool in the bottoms on thoseAny holes in frames or swingarms are often there to allow the escape of hot gasses during welding. It reduces distortion I believe.