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Discussion Starter #1
Is this engine rotary or reed valved? . I assume it is rotary but have not had it apart to check because it runs so well. What basic mods (bolt on)have been done to better this engine/drivetrain.Mine is bone stock and now we cannot do pipes in VT now . Clutch would be a good start, yes?
 

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the 583 engine is indeed a rotary valved engine. CLutching never hurts if done properly. I believe you can also put in the 501 rotary valve, and short intake boots. I know you can do that to the 670, but not sure about the 583.
Anyone?
 

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The 583 is a good motor stock. Run it. I don't think it's cost effective to mess with it. If you want more power get a 670. I don't want to sound harsh but I've been there.
 

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Discussion Starter #4
RVR, not harsh at all. I also have a 98 mxz670. Jetting alone has made the 670 engine rock for me!
 
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