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Kawasaki MX & Off-Road Dirt Bikes
A reason to follow service intervals for RMZ & KXF 250 owners
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[QUOTE="Rich Rohrich, post: 835582, member: 16241"] While we are on the subject of reliability there is something that I have been meaning to address on these engines for a while but up until now it has been fairly speculative on my part so I have been reluctant to say anything. The main bearings in the KXF/RMZ engine are pressed into the cases with a very light interference fit, but unlike most designs of this type there is no locking plate in the case to keep the bearing secure. Keep in mind this engine has no counter balancer so there tends to be a bit more crank mass than say a YZF250 and as a result it looks like it subjects the main bearings to a different type of load than a counter balancer equipped engine. The point is, more and more it looks like as these engines get a lot of hours on them the main bearing saddle in the case looks to be loosening up and allowing the main bearings to move around. This looks to be especially prevelant on the ignition side. Red loctite usage and carefull installation of new bearings looks like a temporary fix, but long term these engines when raced will probably wear the cases to the point of needing complete replacement. Eric and I are looking at the possibility of using a bearing and lock plate setup similar to what Yamaha and Honda are using in the hopes of keeping folks from having to treat case replacement as part of their annual maintenance. As we work more on this I'll pass along any info I can. In the mean time pay particular attention to the main bearings when you are doing your crank maintenance. [/QUOTE]
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Kawasaki MX & Off-Road Dirt Bikes
A reason to follow service intervals for RMZ & KXF 250 owners
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