Maintenance & Technical > KX500 Original

New Power Valves incorrectly machined??

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lsampson:
I recently purchased some new power valves, (Center, LH and RH) and received them yesterday. I installed the center valve, and began installing the LH and RH valves. During Timing, I found it difficult to time the RH valve with the LH valve. Upon further inspection of the valves, I found that the NEW RH valve differed from the old RH valve SUBSTANTIALLY. The slot where the center valve pin rides was rotated (in comparison to the old RH valve).

The RH Valve part number I ordered was 12005-1110. Could they have mis-bagged a KX 250 valve or something??

Here are some pics showing what I'm talking about. The new RH valve is on the left, and the old RH valve is on the right.

kxpegger:
Strange case you got there? Both the old and new have the groove at the bottom of the valve shaft indicating RH. How does it compare to the LH? Did the factory groove the LH by mistake or maybe as you stated it's for a different bike or the factory just screwed up the machining? My understanding is that from "89" to "04" the valves are supposed to be all the same on the 500.

lsampson:
The LH valve was correct, although the opening for the groove was narrower on the new valve than the original grove. I ended up using a new LH valve, new center valve, and the old RH valve to make it work right with as many new parts as possible.

The design of the RH groove is not mistaken with the LH, but its like they had the valve twisted when they began machining the groove. I ordered through Chapparal, but its not their fault. Its bizarre.

lsampson:
Any thoughts Motorrad?

dave916:
i have seen a slight differance on the valves ,
Once  the timing mark are the same in relation to the kipp chamber/exhaust  opening u should be ok
]Fit them on a dry run to see if they are working ok

The slot that are wrong are only for fitting the centre valve pins

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