It is when you start messing around with the enjin that some 450's are not reliable. If you do the same with the 400 the result will be the same. Had a Arctic Cat 400 with a 450 big bore kit on had no problems. Currently I ride a KFX 450 also no problems. Nice for outrides and trails and not to heavy like other 450's, Only 450 together with the KTM that has a reverse. Also experienced no more maintanace than on the 400.
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