I had the same issue (no water nipple in chamber pipe, just stinger pipe), I drilled a hole at the end of the chamber just before the coupler. Bought some 3/8 stainless tube from Ace hardware, cut off a 2" piece and JB welded it in place. Drill the hole slightly smaller than the tube, then ream...
Whats so funny about riding "lake and surf"? I've had both pipes, (have a fpp B pipe now) and can tell you for a fact the B pipe does not make more power than the riva. My riding buddies convinced me I "had to try" the factory pipe, so I bought one. Pulled the riva pipe and installed the FPP...
I had a riva pipe on my 1st B1. After you get everything fixed, mount the pipe on the motor, with the head bracket installed on the pipe only (not screwed to the head). With everything but the head bolts mounted and tight, you MUST shim even the smallest gap between the head and the pipe bracket...
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