Power loss, rattle, knock equals lean to me. The fact that it happens on hills and after a water crossing is suspect. How are your carb vent lines routed? Are they clear? All down is bad. Split them and route the pair from the vertical fittings up high as has been discussed here many times. Also check/clean carb as it can suck dirty water if all lines are routed down.
Don't overlook the gas cap, cost me a race once. The pin holes in the rubber insert/gasket can swell shut and block venting. Cut this middle section out(or replace it with a homemade ring gasket), enlarge the holes in the plastic retainer for the check ball, glue this back on and make sure the ball is free.
Try the simple things first, PVs and pistons don't care about hills.
Jakobi,
The PV bearings are best just cleaned well or replaced (cheap) and lubed with a little two stroke oil. Spooge oil keeps them alive in use. If you run a good high flash point oil they should never be fouled with hard deposits.
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