Superjet revs but barely moves

[badluck]

long story made longer
My kid paddles back the ski saying it’s making a funny noise and not moving. No problem you probably got something stuck in the impeller. Well not the case. You rev it up and sounds good out of the water. Put it back in the water and it revs fine but sounds like the impeller is hitting something and barely moves. I can spin the impeller shaft fairly freely and the mid shaft doesn’t spin. The cap at the coupler is about 1/4” or less. It feels as if the splines on the drive shaft and mid shaft might be slipping.
Thoughts?

 

[Roseand]

Pull the pump and see. Leave the wear ring in the ski if you want to preserve alignment. But if your splines are stripped chances are you're gonna wanna slide the motor forward and realign the pump anyways.

 

[badluck]

So I can hold the main shaft by hand and rotate the coupling. It definitely sounds like it’s barely catching/slipping the splines. It actually appears the mid shaft slipped forward as there is a bit of shiny on the shaft where it goes into the bearing. It’s about 1/4 inch.

 

[badluck]

Here’s a better picture. Motor does not seem loose. It flexes on the rubber motor mounts but seems to stay in place.

 

[badluck]

 

[fastgtfairlane]

Sounds like you stripped the splines on the driveshaft. You'll want to pull the engine, midshaft and pump out of the ski.@Sasquachcrap can hook you up with a new one. Typically the midshaft itself is fine but definitely check it as well. Measure the length of the shaft protruding out of back of the housing. It should be 19.5-20.5mm or .768-.807 from the tip of the shaft to the mounting base of the housing, not the rear of the seal. This will help insure proper spline engagement.

 

[Sasquachcrap]

I can help you out. But a new shaft and midshaft is recommended if you stripped the splines. No since in doing it half way.

 

[badluck]

What would cause the splines to strip? Seems it happened all of a sudden. However my kids the only one riding lately so maybe he never noticed it. At 13 his ass could be on fire and he wouldn’t notice

 

[badluck]

I can help you out. But a new shaft and midshaft is recommended if you stripped the splines. No since in doing it half way.

Are these new shafts or resplining mine ?

 

[jeepcreepcj]

What would cause the splines to strip? Seems it happened all of a sudden. However my kids the only one riding lately so maybe he never noticed it. At 13 his ass could be on fire and he wouldn’t notice

It was probably just badluck

 

[john zigler]

Typically happens from pump/drive NOT properly aligned. Be sure to replace both the drive shaft, and mid shaft. Get the tool, and do a proper pump to mid shaft alignment.

 

[Sasquachcrap]

Are these new shafts or resplining mine ?

Longer Yamaha Oem couch shafts cut down and resplined. Yours is too short.

 

[Big Kahuna]

What would cause the splines to strip? Seems it happened all of a sudden. However my kids the only one riding lately so maybe he never noticed it. At 13 his ass could be on fire and he wouldn’t notice

Motor out of alignment is what causes the splines to strip, Dont just replace 1 and not both, Been there done that, got 15 minutes and destroyed a brand new Midshaft.

 

[badluck]

Longer Yamaha Oem couch shafts cut down and resplined. Yours is too short.

How much $?

 

[badluck]

Motor out of alignment is what causes the splines to strip, Dont just replace 1 and not both, Been there done that, got 15 minutes and destroyed a brand new Midshaft.

Where do I find this tool? Got a feeling I’ll need a tool to remove the impeller too

 

[Big Kahuna]

You need to get an owners manual. https://www.x-h2o.com/threads/servi...uides-–-wiring-diagrams-–-software-etc.74013/

use to you could download from these links.

 

[Sasquachcrap]

How much $?

$175 for a shaft plus shipping depending on location.

 

[john zigler]

Where do I find this tool? Got a feeling I’ll need a tool to remove the impeller too

I have tools available here. Send me an email or call the shop if interested

 

[badluck]

$175 for a shaft plus shipping depending on location.

Sounds like I’ll need both shafts. Contact info to order?

 

[badluck]

I have tools available here. Send me an email or call the shop if interested

Shop name or number?