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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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  #31  
Old 05-11-2021, 06:14 PM
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Gasser Nate Gasser Nate is offline
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Quote:
Originally Posted by maxfli11 View Post
The 2018, possibly other models also had main bearings that have plastic cages. They do fail in the 100 hour range consistently. Don't know why GG would do this other than to save a dollar. They were going through a financial crunch around that time. I've got a friend with one that just got his back together. Get the metal cage bearings to replace with.
Whilst I also prefer the metal caged bearings, they are not a cause for failure. Plenty of manufacturers use them and I have personally seen them do a lot more than 100 hours. People forget that water is never spotless and carries a massive amount of abrasives that are never fully removed unless a tear down is done.


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  #32  
Old 05-12-2021, 10:42 AM
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We had a 2018 engine on the bench and its bearings had no plastic cages. It was the first time the engine was opened. Unfortunately I had not taken any pics but couldn't know that this will be a point of discussion in the future.
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  #33  
Old 05-13-2021, 09:13 PM
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My bottom end just failed at 145hrs.Very disappointed.
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  #34  
Old 05-15-2021, 02:38 AM
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That sucks! What bike and model year if I may ask?
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  #35  
Old 05-15-2021, 05:39 AM
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2018 xc300.
Bought it at 52hrs. It hasn't been drowned since I've had it,so very surprised it failed.Will open it up next week & see what state it is in.
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  #36  
Old 05-15-2021, 06:18 AM
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Oh man, that's no fun. I am currently at 52 hours too
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  #37  
Old 05-15-2021, 07:42 AM
5valve 5valve is offline
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Had a talk with a tuning pro, plastic cage bearings provide better RPM limit, but must be installed with utmost precision, pressure and heat wise,
so having failed bearing at certain hrs goes back to the person, who was assembling the engine.

It is not to save a buck, since plastic cage bearing is more expensive, but more of a hurry, corporate pressure and expertise of engine assemblers.

Remove, install steel cage bearing and avoid further damage.

https://www.youtube.com/watch?v=5RSTnhQcNtw
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  #38  
Old 06-28-2021, 02:21 AM
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UPDATE. One main bearing rusty & completely failed. Other main bearing rusty.
Have never dropped this bike into a river or even had it in water up to the bottom of the airbox. Always run it after washing to help dry it off. I did buy it at 52hrs & now at 145hrs.Don't know how it got moisture in there?
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  #39  
Old 06-28-2021, 02:27 AM
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Quote:
Originally Posted by gg3 View Post
UPDATE. One main bearing rusty & completely failed. Other main bearing rusty.
Have never dropped this bike into a river or even had it in water up to the bottom of the airbox. Always run it after washing to help dry it off. I did buy it at 52hrs & now at 145hrs.Don't know how it got moisture in there?
Did it look like my bottom end?

Perhaps previous owner took her for a swim.... hard to know when you haven't had the bike 100% from brand new.
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  #40  
Old 06-28-2021, 05:36 AM
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My case exactly, bought at 62 hrs, replaced top end, at 65 bottom fail, found rusty and failed bearings and crank inside. Crankcase chamber and transfer ports had darkish discoloration which looked like burned antifreeze deposits. Cleaned off with some chemicals. Piston was black underneath, indicating heat, even though sparkplug was richish.

Could be crankcase porosity, warped head, wrong head oring, previous owner neglection (drowning, pressure cleaning), failing plastic cage bearing, cylinder base gasket leak.
Many options.

Kind of not in a hurry to assemble the engine, since Im not sure if it could be a repeatory behaviour untill true culpit is found.

Even worse case was documented on YT, but dont know if he resolved the exact cause.
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