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Missing silicone

capt

Jet Boat Junkie
Messages
249
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Location
North Fort Worth TX
Boat Make
Yamaha
Year
2007
Boat Model
SX
Boat Length
23
20200524_095637.jpg20200524_095653.jpgI am noticing some cavitation at higher rpms. Mainly when I am pulling a big 3 person tube and am punching it out of a turn.

I noticed some silicone missing from the intake grates would this be the cause?
 
Last edited:

D&S232

Active Member
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Location
Edmond, OK
Boat Make
Yamaha
Year
2009
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Limited S
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23
Very possible! One Saturday after being on the water for a solid hour I suddenly had cavitation on my port side and could not figure it out so I trailer-ed the boat at noon (out of town of course). I got it home and disassembled the impeller housing and found nothing. I took a flashlight and shined it into where the impeller shaft gear connects and saw something small. I fished it out with a wire hanger....SILICONE very thin, about the size of my index fingerprint. Put it all back together and it's been perfect since!
 

Scottintexas

Jetboaters Admiral
Staff member
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Location
Corinth, TX (DFW)
Boat Make
Yamaha
Year
2007
Boat Model
AR
Boat Length
23
And you may look further in the tunnel, i had silicone but it wasn't sticky so when i powered up it pulled away from the hull
 
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