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Sx195 power loss

Jarheadland

Member
Messages
2
Reaction score
0
Points
10
Boat Make
Yamaha
Year
2020
Boat Model
SX
Boat Length
19
I’m new to boating and appreciate the forum. We bought a 2020 SX195 about 10 weeks ago. For the last 2-3 weeks it has had a significant power loss at top end. My recent max rpm is ~5800. I have 39 hours on it. I changed the spark plugs and only gained about 200-300 rpms. Still well below what it should be. Checked all clean outs for blockage. When I go full throttle it acts like a governor and pulls back down. Any ideas?
 

Canuckjetboater

Jet Boat Addict
Messages
375
Reaction score
261
Points
87
Boat Make
Yamaha
Year
2020
Boat Model
SX195
Boat Length
19
I’m new to boating and appreciate the forum. We bought a 2020 SX195 about 10 weeks ago. For the last 2-3 weeks it has had a significant power loss at top end. My recent max rpm is ~5800. I have 39 hours on it. I changed the spark plugs and only gained about 200-300 rpms. Still well below what it should be. Checked all clean outs for blockage. When I go full throttle it acts like a governor and pulls back down. Any ideas?
@Jarheadland ....do you have full range of your throttle....and is it activating at the engine? If not there are only two things I can think of that restrict RPM - choked airflow or choked/bad fuel. As has been suggested check oil level and better yet have the dealership water test it. :cool:
 

Jarheadland

Member
Messages
2
Reaction score
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Points
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Boat Make
Yamaha
Year
2020
Boat Model
SX
Boat Length
19
I do have full range or throttle. I was able to confirm while on trailer. However, the throttle lever between 85% full to 100% full does not provide any additional power thrust. Seems that 85% throttle is the new full throttle.
 

ScottS

Member
Messages
45
Reaction score
8
Points
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Location
Salt Lake City, Utah
Boat Make
Yamaha
Year
2017
Boat Model
AR195
Boat Length
19
Where are you boating? (Elevation). What is the temperature difference from when you first got the boat and when you experience the worst loss of performance? I lose around 300-500 RPM from cool morning temps to daytime highs.

Edit: Also, have you had your 10-hour service?
 
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