Back to the original topic: I have used both cams (200x and 185s) in both applications. when I put the 200x cam in my 185s, I had to adjust the valves a little. The back side (opposite the cam lobes) seems to be jut a bit thicker on the 200x cam.
The only real performance difference I noticed was a shift in the power band. I lost some on the low end, and gained some on the high end. It didn't really work well for me, and the type of riding I do most (lots of steep hills at crawling speed). I went back to the 185 cam, and even put a 185 cam in my 200x.
The xr200 and xr200r cams will also fit, and both have different lift and duration than the 200x and 185/200s cams. Using a different cam without the added compression/stroke will pretty much just move your power band around. It won't render more horsepower.
If you constantly run your trike at full throttle, you might want to put the higher lift cam in to move your power/torque range up to the high end. If you need a wide power band for general use, hauling, pulling, etc., then stay with the stock 185/200 cam cause that's what it was designed for. If you're looking for "More" power, then you need to consider overbore and/or higher compression piston.
***Note for 1985200s and Jason T**** I just had my 185s cylinder bored to fit a stock 200x piston, and they had to make 3 cuts of 0.010 to get there. The 185 piston definitely smaller, and the cc difference comes from the bore size AND the stroke.
Darrell
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