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Loss of power under load

Sebastiaan

Well-Known Member
Messages
3
Reaction score
0
Points
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

Jet Boat Addict
Messages
539
Reaction score
425
Points
87
Boat Make
Yamaha
Year
2020
Boat Model
212S
Boat Length
21
How does the impeller look?
 

F.M.

Jetboaters Commander
Messages
839
Reaction score
1,202
Points
177
Location
Decatur, AL
Boat Make
Yamaha
Year
2017
Boat Model
242X E-Series
Boat Length
24
Sounds like cavitation.
 

scokill

Jetboaters Captain
Messages
1,089
Reaction score
722
Points
207
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 Captain
Messages
2,288
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2,768
Points
247
Location
Saint Petersburg, FL. 33702
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.
 
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