09 Nytro running rough

[jaydaniels]

It only takes a second of low oil pressure to damage a rod bearing. Once damaged the motor may last anywhere from a few hundred up to a thousand clicks and then it goes. The low oil pressure does just enough damage to the bearing that you end up with to much clearance . This means more contact then over time it gets worse until it finally goes kaboom.

 

[upei93]

It only takes a second of low oil pressure to damage a rod bearing. Once damaged the motor may last anywhere from a few hundred up to a thousand clicks and then it goes. The low oil pressure does just enough damage to the bearing that you end up with to much clearance . This means more contact then over time it gets worse until it finally goes kaboom.

Maybe...to top things off glare ice under fresh snow in my buddies driveway and smashed my new car...bad 3 days! Making progress though...

 

[canoehead]

As I mentioned earlier an ROV is alot cheaper than a new motor. The middle rod is prone to grenade after a couple of seconds of low oil pressure. I believe that was your culprit. As JD mentioned could be a couple of hundred or a 1000 klicks. Then BOOM. It was the middle rod correct.

 

[upei93]

As I mentioned earlier an ROV is alot cheaper than a new motor. The middle rod is prone to grenade after a couple of seconds of low oil pressure. I believe that was your culprit. As JD mentioned could be a couple of hundred or a 1000 klicks. Then BOOM. It was the middle rod correct.

Yup...

 

[upei93]

Centre plug...

 

[herndonp]

Was it a lean burn down or a crank bearing failure? What was left of the piston?

Pete

 

[upei93]

Haven't opened it up...the guy I bought my engine from wants to buy it...he is a yamaha mechanic so I'll probably sell it and find out from him...anybody have an ideas what a engine is worth that has a hole in it? Rod took out the starter...stator is good not sure what else? BTW if anybody is thinking of changing an engine it's not that difficult...just takes a long time!

 

[jaydaniels]

After a motor goes like that normally not much is salvageable. The head might be okay as long as the piston didn't make contact when the rod went. I had one do the same and all that was good was the head (after replacing a couple bent valves), stator and a couple pistons and rods. A few other odds and ends. Not sure what a damaged one would be worth but I'm thinking a couple hundred dollars??

 

[jaydaniels]

I see your plug was damaged so the piston likely hit the plug.