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Loss of power under load

Sebastiaan

Well-Known Member
Messages
6
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60
Boat Make
Glastron
Year
2015
Boat Model
GTS
Boat Length
19
Hi guys,
2015 rotax 4-TEC 250 single engine in a glastron 187.
on the trailer with the water hooked up she starts straight away and runs smooth. No strange sounds, no smoke etc.
At the ramp, as soon as we want to go and the engine is under load she struggles, makes a bunch a noise and has no power. Struggles to move at all. No engine alarms to speak of, no fault codes flash up?
Any ideas?
Thanks a lot!
 

anmut

Jetboaters Admiral
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Boat Make
Yamaha
Year
2020
Boat Model
212S
Boat Length
21
How does the impeller look?
 

F.M.

Jetboaters Admiral
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Location
Decatur, AL
Boat Make
Other
Year
NA
Boat Model
Other
Boat Length
Other
Sounds like cavitation.
 

scokill

Jetboaters Admiral
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Location
Rowlett, TX
Boat Make
Yamaha
Year
2008
Boat Model
AR
Boat Length
23
Sounds like cavitation for sure. Don't know much about your boat but could be fishing line, twigs, trash etc around the impeller.
 

Dean P

Jetboaters Admiral
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Location
Florida
Boat Make
Chaparral
Year
2017
Boat Model
VRX
Boat Length
22
You should be able to look into the back of the jet with a flashlight for some obstruction. Also note it come be on the intake side as well.
 

Sebastiaan

Well-Known Member
Messages
6
Reaction score
0
Points
60
Boat Make
Glastron
Year
2015
Boat Model
GTS
Boat Length
19
Hi Guys,
Thanks for the feedback.
so the tube is free and clear.
I run in salt water so the impeller is rusty but not missing any blades or anything.
What should I be checking next?
Thanks, 23CDBC4E-B803-4220-A8EB-029BBF800618.jpeg5186D6B3-2F4D-41FC-82FE-FC83EAABD684.jpeg
 
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