I'm Just wondering what the difference is form my 03 Rev 800 and the 04 and newer 800HO engines. Are the parts interchangable, eg. Reed cages, Heads and cylinders. Also is there a noticable power difference in them.
The 800 H.O. uses a different timing curve, different reeds and spacers, different exaust can as well. The porting is different too. The Ho has an exhaust port that has been raised about .040", apparently the upper case half is "decked" shorter (presumabbly to aid in accomplishng the port demensions they wanted), the head camber is slightly different shape. The bottom end is the same so no issues there. All in all it adds up to about 5-7 extra ponies. The head and cylinders off an H.O. will fit on a non H.O.
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