Quick Crank Bearing Question.

[Krandall]

Is there any standard rating of time before you should replace crank bearings or any signs without tearing the motor apart to know when they are getting bad?

[Sandeater]

Throw a KDS 14:1 piston in there and you will find out if they are going to fail or not 

If you ride a lot of wheelies, it starves the crank bearings of oil and will cause them to fail a lot quicker.  Otherwise probably several hundred hours.  Depends on riding style really.....

Ride it til she goes.  Thats what I am doing anyway.  Mine is an 06 and I race quite a bit and wheelie sometimes but not very long distances.  Not sure on how many hours are on the motor.  Many.

[Krandall]

Fair enough. i was just wondering. I know theres the general maintenance. But wasn't sure if anyone has yet to have to replace crank bearings.. Or I could just get another crank.. worries would stop.

[redrumin700]

i just put a new crank in my 06 700...like mentioned above i have hundreds of hard hours on it

[Bert]

i just put a new crank in my 06 700...like mentioned above i have hundreds of hard hours on it

Did the OEM crank need to be replaced

[redrumin700]

i just put a new crank in my 06 700...like mentioned above i have hundreds of hard hours on it

Did the OEM crank need to be replaced

yeah i bought the whole crank assembly. it was about 300 bucks. well worth it, i just put in another oem one because this one has lasted three years

[Krandall]

Might I ask, What happend? Bearing lockup? Or just figured it was time?

[redrumin700]

yep thats exactly what happened. rod bearing came apart...for some reason rod bearings dont like me..my 05 yfz locked up too...it might have something to do w/ over revving all the time. i ride these things like i stole them...well you kind of have to when you race i just put 1500 dollars into my raptor this month ill throw up some pics when its all done the end of this week

also krandall from what i see in your sig is a broken swing arm. how did you pull that one off

[Krandall]

Here's the story on the swinger.. 

http://www.raptorsource.com/forum/index.php?topic=1932.0

[digitalhearing]

I have duned my 07 since I bought it in Nov 06 and rode it on the average of twice, hard in the sand untill now.  I stroked it with an 8 mil crank a year ago, dyno'd it 3 times (with about 150 pulls) and raced the hell out of it constantly and reving it up to the rev limiter a lot.  This motor is holding together great so far, knock on wood.  I do change my after every other ride and use amsoil synthetic so i'm sure that helps too.

Grant