Is it time to replace my crank?

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upnorthbacon

Member

Jan 28, 2005

35

0

• Feb 11, 2005

• #1

2000 kx250 just purchased. How do I check the crank bearings need replacing? Mostly curious about the bottom bearings? I took the pipe off and can move the crank slightly back and forth through the case? Is that normal? I'm assuming I have to take the jug off and measure something to know for sure? What special tools will I need if I buy the hot rod kit which comes with the crank?

 

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WillyM

Member

May 18, 2004

84

0

• Feb 11, 2005

• #2

I have found with my KX is when in doubt replace it.
The bottom end berrings are pressed onto the crank ,and you could just replace them .
The rod bottom berring should have no up and down play that you can feel.

 

KaTooMer

~SPONSOR~

Jul 28, 1999

435

0

• Feb 12, 2005

• #3

A little side-to-side play is O.K., like Willy said, it's the up-and-down play you don't want. When that happens, it's often the big-end bearing (on bottom of the rod) that needs replaced. If that's the case, the crank halves would need to be separated. I don't know too many people who have the tools to do this themselves. The cost of having it done - with a new rod - is probably about the same as buying the complete rod/crankshaft from Wiseco (have seen these for $180-190 on eBaay). Installing the complete kit is more doable for the mechanically inclined.

 

C

Camstyn

LIFETIME SPONSOR

Oct 3, 1999

2,246

2

• Feb 14, 2005

• #4

When my bottom end started to go on my '00 KX250 it began making a whirring noise, most noticeably on deceleration.

 

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noosa_nick

Member

Mar 22, 2004

7

0

• Feb 17, 2005

• #5

Remove your engines left hand side cover and check the rotor for any movement. If you find any your crank bearings need replacing.

 

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upnorthbacon

Member

Jan 28, 2005

35

0

• Feb 17, 2005

• Thread starter
• #6

Thanks for the replies.