2007 EC250 Crank Bearing?

[BIG TOOL]

Hi Guys,
I just found out that my 2007 EC250 Left side (ignition) crank bearing is bad. It sounded a little loose since the bike was brand new, and it finally worked the crank seal out of its bore. Thats a first for me! Anyway, after pulling the stator plate off, I found the crank bearing to be loose but not yet a catastrophic failure. I remember a few years back there was a rash of bearing failures, does anyone remember what the fix was? And, does anyone know what part # I should give to my local bearing house to get my replacement part? Thanks, I'll let you know how it all turns out...
P.S. should I replace the other side bearing while I'm there?
FYB

[GMP]

Thats really odd for a newer bike. The newer bikes use a two piece roller bearing for the ignition side, like a KTM. Download the shop manual and you will see you have to remove the inner race from the crankshaft and bearing from the cases separately. My '03 and '07 had/have very noticable radial play when new, but its normal for a bearing like this. By ball bearing standards, grabbing and moving the flywheel will tell you the main is shot, but not so. Are you sure the bearing went bad and disloged the seal, or the seal was improperly seated and came out? How many hours on your bike? Premix ratio? My old '03 has well over 200 hrs on the original mains and feels like new. '07 has 45 hrs now, no problem. Unless your absolutely sure the bearing is bad, replace the seal and ride it.

[BIG TOOL]

I thought this was odd too, But I'm sure the bearing is bad... As I got deeper into my tear down last night, I found the big end rod bearing was bad as well. In fact, I've never seen so much movement in a rod bearing that wasn't yet completely failed! The small end rod bearing and wrist pin look brand new, so I don't believe its an oil problem, but I never say never... The motor has less than 20 hours on it, I run 40:1 premix, and I can only hope this was a freak thing. My '01 XC250 had well over 300 hours on the original crank and rod bearings using the same 40:1 premix. In fact, it is still riding around out here!
On a side note, the coating on the piston was starting to come off in a couple of places as well. I'm not sure if I'm a fan of that stuff (anti friction coating) or not. Now for a complete crank rebuild...

[gasgasman]

I would say you bike was running very lean.

The wrist pin bearing looks "good" because it does not rotate/spin like the connecting rod bearing.

Be sure you find out the cause before you ride the bike.

RB-Designs does an inexpensive crank rebuild ($35).

[gasgasman]

Originally Posted by gasgasman

Be sure you find out the cause before you ride the bike.

Never mind, looks like the crank seal was your initial issue.

[GMP]

Sorry to hear that. You might ask Ron about pulling that race off the crank, looks like it could be a PIA without the correct puller or a press and jig. The piston loosing coating is normal, as long as its not scored. Might as well replace that too and start out fresh. I'm doing mine soon as winter sets in, probably near the 60 hr mark.