Kibblewhite valve spring breakage?

Cadpro18
Posts
174
Joined
10/17/2013
Location
Crystal Lake, IL US
11/26/2014 12:26am Edited Date/Time 11/27/2014 2:54am
How is KW valve spring reliability on CRF/KXF 250s? Any breakage?
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Paw Paw 271
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3640
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4/3/2013
Location
Benton, LA US
11/26/2014 2:16am
I have seen no problems with them over the years.

Paw Paw
slipdog
Posts
10043
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7/25/2009
Location
Nor Cal, CA US
11/26/2014 3:49am
I saw all 4 springs break at 10hrs on an '11 KX 250f. Also saw intake springs unable to control valve float on an '09 YZ 250f, both times were with high lift camshafts well within KW's lift range. Never saw a problem with CRF type conversions running stock camshafts though. I don't recommend them for any performance type of application.
neysbo
Posts
1820
Joined
4/1/2008
Location
Edelstein, IL US
11/26/2014 5:37am
Have seen and heard of a some issues with them, know for sure 2 people one KXF and one CRF that had issues this year
Cadpro18
Posts
174
Joined
10/17/2013
Location
Crystal Lake, IL US
11/26/2014 7:53am
Seeing a pattern with 10-14 CRF/KXF250 breaking at 12-15 hours. Sometimes only inner or only outer, sometimes both...

The Shop

11/27/2014 2:54am
I have seen CRF250 and KX250F fail, I wouldn't recommend them over stock.

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