[depotij]

I was just out on a ride today when all of the sudden. Clink, and frozen!! Can't even move the kickstarter. I took the oil dip stick out and placed a large magnet inside the hole. Low and behold tons of metal shavings. My bike is a 2005 CRF250R. Has anyone had similar issues? I am debating on doing the job myself or not. Any ideas while it is apart too would be welcome.

[n.i.mxer]

big end bearing has more than likely failed. Usually with this the filter is full of brass shavings If it's still the original crank on a 2005 model, you've got good lifespan out of the crank. Handier to set a new crank in. Though you will probably have to clean up the cases aroung the crank as there will probably be damage. And thoroughly clean the whole crankcase. All the oil ways and nooks and crannies will have shavings in them

[depotij]

Yeah it is still the original crank. So how often do should you rebuild the bottom end then?

[124]

Yeah it is still the original crank. So how often do should you rebuild the bottom end then?

I disagree with the post above. Crankshaft bearings with a "regular" type rider should last many years longer than your's has. Only pros or someone who's racing/riding all week should worry about rebuilding the crank on any type of yearly schedule. Us "regular" guys/girls should not have to worry about it if the bike is maintained well.

As stated in your other post depotij, either someone rode the hell out of this bike almost everyday or did not maintain it properly.

[depotij]

I think the kid didn't maintain the bike correctly. The radiators are a little beat up so I am assuming he hit a few trees or dropped it a few times.

[n.i.mxer]

Yeah it is still the original crank. So how often do should you rebuild the bottom end then?

I disagree with the post above. Crankshaft bearings with a "regular" type rider should last many years longer than your's has. Only pros or someone who's racing/riding all week should worry about rebuilding the crank on any type of yearly schedule. Us "regular" guys/girls should not have to worry about it if the bike is maintained well.

As stated in your other post depotij, either someone rode the hell out of this bike almost everyday or did not maintain it properly.

Don't forget this bike being an 05 model is in it's 4th year of use. And even a 'regular type rider' as you put it, is still clocking up run time on the engine. Add in the possibility of extended oil changes and maybe the use of lower quality oil, and you have good reason for a crank bearing failure. These are competition machines, after all that need regular maintenance.

[124]

I fully understand the regular maintenance schedule. I also understand the loads and requirements put on the machines even when ridden by an average rider. I may even agree with you about regularly servicing the crankshaft if the rider in question could do all the work efficiently. However, 99% of the riding population are not inclined to think about doing a job like that themselves. I've done dozens of crank rebuild R & R's and although I'm still not as proficient as I could be, I'll still wait until she blows. I can do the job in a few hours too. It's just not something anyone should have to worry about after 3-4 years of moderate usage. Just for S & G's, here's what the manual says:



I tend to agree with you only because I'm anally rententive when it comes to maintenance. I would disagree on a general usage basis just because of the severity of the rebuild process.

I guess there was no real reason for the lengthened post, I could have just said "yup".... Lol.