Nytro Motor Noise

[matpoh]

I purchased a used Nytro for parts a while back and am going back and forth between parting it out or keeping it running. It currently starts, runs, and drives as it should with zero warning lights on the dash. Only issue is a very annoying tick in the motor and I am looking for some thoughts on what to look for first. I removed the primary clutch to narrow down the noise. Check the posted video to hear the tick/noise. It does speed up along with the motor but not shown in video.
Attached Video

 

[Jori K]

Meybe in can be stubshaft bearing?

 

[sweetjob]

Exhaust leak or sticky valve??

 

[sideshowBob]

That does not sound good to me. I think that is a Rod bearing, valve, or piston issue and I personally would not run it like that.

 

[Srxspec]

Don't run it any longer!!! Rod bearing or it's one of the bearings on the counter balance shaft, regardless, do not run it!!!

 

[kinger]

Ouch! Check the oil for glitter, if its a rod bearing and as bad as it sounds, it should be full of glitter. If the oil is clean, I believe the Nytro/Vec motors have a cam chain tensioner recall and that caused some ticking as well. However nothing that bad IIRC.

 

[Srxspec]

Ouch! Check the oil for glitter, if its a rod bearing and as bad as it sounds, it should be full of glitter. If the oil is clean, I believe the Nytro/Vec motors have a cam chain tensioner recall and that caused some ticking as well. However nothing that bad IIRC.

Cam chain tensioner recall was only carb model Vectors, none of the EFI 1049 engines were affected.

 

[Fast Lane]

Timing chain rattling around? Maybe a guide broke. Sure doesn't sound good. Get a stethoscope and see if you can hear where its coming from. Over my Macbook speakers it sounds like a higher pitch than a rod bearing.

 

[Srxspec]

99% positive it's a counterbalance shaft bearing making the noise (or possibly the PTO bearing on the clutch stub shaft, again stop running it, if the counterbalance shaft lets go it ruins everything!

 

[matpoh]

I finally got a chance to start this project and got the subframe off along with the sump cover. The bottom end is full of metal and I am leaning towards looking into the counterbalance shaft bearing. Is there a way to get at it from the bottom end without pulling the entire motor? There is so much room to access everything I would like to save the time and not pull it out if I don't have to. What are your thoughts?

 

[STAIN]

Time for a teardown. That much debris going through the engine warrants an inspection of everything.
Maybe a used engine would be an option if you don't want to rebuild it.

 

[Fast Lane]

That engine is done for. Pull it and replace it with a used one.