GP1300R happend slow down speed and vibration problem when water test about 15min past.
Ski was runs fine nothing happend first so I almost gave up to make sure but it was lucky to happend problem finally. Problem maker was silicon bit that peel of from sealing around pump duct. Also this problem involved inpeller gap as well. This ski's impeller gap is just over 0.6mm, STD is 0.3mm.
In short if this gap was 0.3mm this silicon bit didn`t stick, should cut 2 piece like a cut by knife and didn't happen this problem.
