YAMAHA?????
from bulkhead to to bottom of exhaust manifold. from head to to oem head pipe( the small 1/8 line goes to top of chamber. On oem exhaust all water dumps into it. You can T the line from head to pisser.
why not bore it to next size up prob .25 , jetting should not matter and u will not loose bottom end, porting wont be messed up, But u need to find the cause of rear deto.
what do u mean, u might have to use the stock bilge tube for the duel cooling or run a new line, u have to tap the pump for second line, and tap the exhaust manifold for the second input.
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