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240SX throttle issues

Scott Smith

Well-Known Member
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14
Reaction score
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Boat Make
Yamaha
Year
2014
Boat Model
SX
Boat Length
24
I have a 2014 240SX and this weekend I experienced throttle issues. When I push down even full throttle I can only get to 13 mph. I checked for obvious intake blockage and saw nothing. What could be the cause? Impeller damage, hidden blockage, linkage problems? Need help troubleshooting this issue. Thanks
 

subysti

Jetboaters Captain
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Location
east Longmeadow Mass
Boat Make
Yamaha
Year
2015
Boat Model
AR
Boat Length
24
Are you getting full throttle rpm's? If so it could be cavitation by a blockage or maybe clean out plug loose. If the engines are both getting full rpm's then it could also be the cable to lift the jets nozzles out if the way. I k ow it's called something else but just having a brain fart now.
 

bigblank69

Jet Boat Addict
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What's your RPMs at?
 

Scott Smith

Well-Known Member
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14
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Boat Make
Yamaha
Year
2014
Boat Model
SX
Boat Length
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Are you getting full throttle rpm's? If so it could be cavitation by a blockage or maybe clean out plug loose. If the engines are both getting full rpm's then it could also be the cable to lift the jets nozzles out if the way. I k ow it's called something else but just having a brain fart now.
I am not get to getting more the 6500 rpms and only about 12 mph.
 

Scott Smith

Well-Known Member
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Yamaha
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2014
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SX
Boat Length
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I am not getting more the 6500 rpms and only about 12 mph.
 

Scott Smith

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Tops at 6500. And only 12 mph. No thrust power
 

subysti

Jetboaters Captain
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Location
east Longmeadow Mass
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Yamaha
Year
2015
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Thinking maybe the buckets aren't going up fully. If they are still in the way they will overload the engine and stop it from revving and not get your full speed. Make sure they go all the way up at the first throttle stop. Also recheck your clean out plugs.
 

Scott Smith

Well-Known Member
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Yamaha
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2014
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SX
Boat Length
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Ok I will look at my linkage. Thanks
 

Scott Smith

Well-Known Member
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Yamaha
Year
2014
Boat Model
SX
Boat Length
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My clean out plugs are clean. Anything thing else I need to look relative to the clean out plugs.
 

Hannibal

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Is your boat on a trailer? Can you see in the jets from the rear? If the cleanout plugs are in properly, there's got to be a wad of grass in each impeller or the intake grates clogged up with something if 6500 rpm isn't getting you up to speed.
 

Hannibal

Jet Boat Addict
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2016
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When you were at 6500rpm, were you getting a good stream of water from the outlets. Should be a strong stream at that rpm.
 

Scott Smith

Well-Known Member
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SX
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Yes it appeared so.
 

subysti

Jetboaters Captain
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Location
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Year
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Any update?
 
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