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Yea it sounds like a pump problem. It is pretty easy to check. Use a feeler gauge to measure clearance between the impeller and wear ring. I'm not sure what the spec. is for the SHO, but someone on here probably has a service manual. On the older FX HOs it should be between 0.35-0.45mm. Check it at multiple points. Also look carefully at the impeller for dents, etc., that will reduce performance.
 

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If the SHO is like the older FX HO models, there is really not a separate wear ring. Basically the wear ring is part of the impeller housing, so you have to replace the whole housing. Its not too big of a project, but you will need a tool to hold the drive shaft, etc.. Aftermarket housings are available which do have replacable plastic wear rings. Some guys recommend them if you ride in certain conditions where you will be constantly ruining the stainless steel lining in the OEM housing, but the plastic rings do tend to wear more quickly than the OEM SS housing.

 
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