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Yamaha waverunner vxr wont go past 5krpm and 30mph

Y

yamahavxr

Member
Messages
9
Reaction score
0
Points
10
Boat Make
Yamaha
Year
2013
Boat Model
VRX
Boat Length
NA
Got a yamaha waverunner vxr with 177 hours that's stuck at 30mph and 5k rpms . So far I have changed spark plugs , cleaned fuel injectors, driven with seat off , looked for loose hose connections and nothing seems to be fixing it .
Battery reads 14v on screen and shows no codes . Ski runs good under no load when I'm jumping small waves it speeds up and then bogs Down
Initial acceleration after starting is rough too until it warms up a little.
Anyone knows what it could be that I could change or fix to solve this issue ? Thanks in advance
 
Last edited:
yamahavxr said:
Got a yamaha waverunner vxr with 177 hours that's stuck at 30mph . So far I have changed spark plugs , cleaned fuel injectors, driven with seat off , looked for loose hose connections and nothing seems to be fixing it .
Battery reads 14v on screen and shows no codes . Ski runs good under no load when I'm jumping small waves it speeds up and then bogs Down
Initial acceleration after starting is rough too until it warms up a little.
Anyone knows what it could be that I could change or fix to solve this issue ? Thanks in advance
Click to expand...
5k and 30mph seems like its in Lerner mode.
 
That's what I thought too but L mode light is off and I have no remote to check it . But i figured if it was in L mode it won't go fast when not under load . Somethings definitely wrong somewhere, if I press Throttle hard right after starting it ,ski misfires and vibrates , takes a while for it to run smoothly, but once it starts going , it goes good till 30mph
 
Did you check compression?
 
Make sure all the coils are firing
 
I'm planning on doing it today , kinda dreading it. I'm gonna clean fuel filter and injectors again today to see if they are the cause
 
Neutron said:
Make sure all the coils are firing
Click to expand...
For the coils , can I pull their plugs out 1 by 1 to test them that way or should I use multimeter ? I read somewhere that it's unsafe with tge unplugging method
 
yamahavxr said:
I'm planning on doing it today , kinda dreading it. I'm gonna clean fuel filter and injectors again today to see if they are the cause
Click to expand...
Doubt its an injector, more likely its a coil, seen many of those go bad
 
yamahavxr said:
For the coils , can I pull their plugs out 1 by 1 to test them that way or should I use multimeter ? I read somewhere that it's unsafe with tge unplugging method
Click to expand...
Leaflve plugs in, pull coil out one at a time put an old plug in coil and ground it to the valve cover and watch for spark. Repeat it with every coil
 
Ok I'm gonna try that, I have some old spark plugs. Thank you for answering
 
So I took apart the Throttle body hose that goes from air filter to Throttle body and there's traces of oil (engine oil I assume ) . Does that mean my engine oil is overfill ? It shows full mark on cold and was showing full mark on water after running
 
Some traces of oil is not your issue. If it was so bad that it fouled the plugs then yes but its not that bad
 
You are misfiring so start with the coils and go from there. Spark, fuel, compression and go from there. Then when you figure out which one is the culprit then find out why. Start with the basics first
 
This is how the new plug looks after 4 hours of use . The oil seems pretty significant actually, I see it on Throttle body too , I just finished cleaning it. There's no air filter in it , is it bad to run without air filter?
 

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I saw some carbon build up on plug that came off when I scraped with my finger
 
Should have an air filter. But not your problem at the moment
 
So I just tested each coil for spark by unplugging coil and using old spark plug in it , unplugged the fuel injector and started the ski and they all have spark. How do I check if I'm getting enough fuel by the fuel pump? . I also took 2 quarts of oil out and now the oil level just reaches tip of the dipstick at cold
 
yamahavxr said:
So I just tested each coil for spark by unplugging coil and using old spark plug in it , unplugged the fuel injector and started the ski and they all have spark. How do I check if I'm getting enough fuel by the fuel pump? . I also took 2 quarts of oil out and now the oil level just reaches tip of the dipstick at cold
Click to expand...
You would need a fuel pressure gauge and the spec to test that
 
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