How long do crank bearings last

[jakim]

I am getting ready to replace the top end in my 09 m1000. It is piped and running a PCV on it. All the extra motor mounts and I have 3800 miles on the engine. Its never missed a beet. I am concerned about the crank. Before I waste my money on the top end what should I do to make sure the bottom is in good shape. It has been piped since new also still the original primary clutch. However I have also purchased a new clutch and already had it balanced. I have never had a crank problem so dont know what it costs to replace or how much work it is to do. Any help would be apreciated.

 

[Sledbrain2]

I would like to know as well?

 

[RACINSTATION]

This reminds me of the Ron White joke where the plane they are on loses an engine and another passenger asks "how far will the other engine take us?" Ron replies, "All the way to the scene of the accident!"

With 3800 miles on an engine there is no telling. I would personally check runout and the bearings on the bottom end. Now is the time to do it before you are in the middle of an awesome year.

 

[MNCF1000]

I remember reading a post on here a couple years ago that said expect to replace pistons at 2000 miles and the crank at 2500 miles. I believe it was by Racinstation. I blew up my 09 1000 at about 2500 miles. Scored both pistons and screwed up the cylinder plating. I tore down the motor and sent my crank to Northern Crankshaft for inspection. They said the crank looked fine so I put it back in. I'm not sure why I scored the pistons never could find a reason, I'm suspecting bad gas. I would say it would be a good idea to have it inspected at least.

 

[mr p-j]

how many cranks have gone bad on the 1000? cant be that many???

a rotax 800.........

 

[jayp]

Anymore I'm of the opinion that with any m1000 it's not will you but when you...have a crank failure. I had Stan Gardner of GRC redo my spare lower end so it is ready, along with spare pistons, cylinders, and diamond drive. My idea is that if I have them on hand, they won't fail.

 

[mmsports]

m1000

Its the Rod bearings that I have seen and only a select few. Not all.

Got to love Ron White. LOL