How can this happen ?

Location
KSA
I started to do the off season maintenance and when I decided to replace the crank seals, I saw this >>>

20180523_034110.jpg

20180523_034018.jpg

What can possibly cause this rust on the crank? Also it appeared on the bottom side of the sleeve and it is just formed on the rear cylinder.
 

DAG

Yes, my balls tickled from that landing
Location
Charlotte, NC
Likely water ingestion through the carbs or backfeed from the pipe. Alsways run hard and dry before putting it away.
 

Quinc

Buy a Superjet
Location
California
Every night after riding surf and anytime I store the skis longer then a few weeks:
61euBVbN5oL._SL1000_.jpg
 

DAG

Yes, my balls tickled from that landing
Location
Charlotte, NC
Water is in the exhaust. If the nose is raised high gravity pushes the remaining water into the cylinder. Trailering can also do it.
 

Big Kahuna

Administrator
Location
Tuscaloosa, AL
I always blow motor out really good the pull full throttle for a few seconds then reach up and hit the off button while holding throttle wide open until completely shut down, this way it pulls fuel into the cylinders at the last second but there is no way for it to burn, gives a light coating.
 
Location
KSA
I do the same after every ride and blow all the water from tge exhaust. But lately during high jumps and raising the nose up, the ski bogg and looks like it will shut off. Does this explain the water from the exhaust?

I took the crank out and it was only a layer of rust that didn't reach the core.
 

Big Kahuna

Administrator
Location
Tuscaloosa, AL
I would actually guess that you may have had an oring leaking or head gasket leaking water. Or, your plug wires were breaking down (broken strands near the plug boot). Both would have the same effect while riding.
Water blowing in would get worse at higher RPM's = More pressure.
 

Blue

Judging your cheapness
Location
St Cloud Florida
I do the same after every ride and blow all the water from tge exhaust. But lately during high jumps and raising the nose up, the ski bogg and looks like it will shut off. Does this explain the water from the exhaust?

I took the crank out and it was only a layer of rust that didn't reach the core.
Your not planning to run it are you? Theres no way to tell if the bearings are pitted.

Sent from my SM-N950U using Tapatalk
 
Location
KSA
I would actually guess that you may have had an oring leaking or head gasket leaking water. Or, your plug wires were breaking down (broken strands near the plug boot). Both would have the same effect while riding.
Water blowing in would get worse at higher RPM's = More pressure.
Am using ADA head with a new O rings. At high speeds everything is fine only when I go to WOT from 0 it struggles to go.
 
Location
KSA
Your not planning to run it are you? Theres no way to tell if the bearings are pitted.

Sent from my SM-N950U using Tapatalk
I started to check and clean it and soaked it in WD40. But when removed I rotate the crank and it didn't feel any roughness or abnormal sound from all bearings.
 
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