Here are a couple pictures. I have a ’51 and a ’53 big twin. There is one rubber grommet that seals the up water tube from the exhaust housing. #302636 That might be your problem. The upper end of the water tube has a ferral or flared end that attaches to the small housing between the power head and the exhaust housing. I sealed both of mine up with yamabond last summer and they pump great. The water pump pushes water from two cavities to the back of the exhaust housing where the up water tube hangs. These motors are fun to run but a bugger to crank for an old guy!
dale
sorry can’t post pics today
