1/2 revolution, stops. Valve or gear?

[H20ham]

Our new to us 175xr2 sport jet engine will only turn 1/2 revolution
3 of the spark plug holes have some form of compression and suction on the other 3
It feels like somethin has dropped or a tooth has bent at the jet gear union.
Does not feel like a valve. But!
Any ideas?

Kind Regards

 

[Grub54891]

Is there water in the cylinders?

 

[GA_Boater]

Welcome aboard.

The 175 XR2 is a 2 stroke, so no valves. That isn't much help, I know.

You might need to remove the impeller shaft or power head to determine if the pinion gears are causing the jam up.

Boatinfo.no has an online manual.

 

[H20ham]

I am sure it is the gears it having nothing resembling valves then
Thanks!

 

[H20ham]

Says after I remove nozzle assembly to drop the stator down. I might need a special tool that looks like a flat T with a slot in it and a narrow fitting spark plug tool. Unless I want to replace the seals on the stator, that is he only special tool? The jet drive will come down with the correct nuts and bolt removed?

 

[robert graham]

Maybe rope or similar stuck in the jet impeller???

 

[H20ham]

It says that after I remove the stator and unless I want to replace the seals on the impeller, the only special tool I need is a T screwdriver with a slot in it, & small tight fitting spark plug size socket. Jetdrive will just drop down after nuts and bolts are free

 

[H20ham]

I pulled off the cover and it spins freely until the halfway point

 

[H20ham]

I have pulled 8 nuts off the head to drive
The manual says there are 4 more once the head is off

Should I have the ride plate off first?

Thanks!

 

[H20ham]

I suspect it is a bearing
And I don't see grease nipples
So, whilst apart. Other things...
Oil squirt/injection gear?
All other bearings...?

KindRegards

 

[H20ham]

The other thing will be, where do I order parts from.
I am in the middle of nowhere bc Canada. But I have a USA shipping box in Bonners ferry id

 

[BLKBEARD]

Can you pull all of the spark plugs out and insert a drinking straw or something similar into the holes, and turn flywheel by hand to verify that all pistons are moving? A broken connecting rod can give you a partial revolution, then the crankshaft offset hits the broken rod and it won't turn further

 

[H20ham]

Thanks Blkbeard, first thing was a boroscope. All Pistons move up and down. Don't know my train of thought there. But really what else?
I separated engine from jet housing. It is not the jet. Jet turns freely.
Engine on the other hand, only gives 1/2 rotation in either direction. Humf

 

[Faztbullet]

Skirt on piston broke and in bottom of a cylinder.....will need tear down.

 

[H20ham]

Ahh right. Makes the most sense.
No chance if it was beached rear in. Rock or something could get in?

Where is/are the best prices on engine parts. I suspect I can find a piston in fleabay. Head gaskets, etc... What else?
Also, anything on the While In There list
Oil injector gear...

Thanks!

 

[Chinewalker]

Magnet broken off flywheel getting jammed in stator?

 

[H20ham]

Ahh interesting
Anyone for something in top of piston
8 am pst. Will tear the heads off today

 

[H20ham]

Piston top #6

 

[GA_Boater]

Any photos?

 

[H20ham]

Testing if this photo of #6 detonation works
Question is why
#1 ok
Purchased the boat, plugs were removed
Have pic of #3 soon