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never heard of it. is it something the ninja 650 guys do?

would be interested in seeing the cam specs for the ninja 650 and versys cams.
 

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Way back when I was 'messing' w/ Triumph 650s (in the '60s...), the Bonneville came w/ (their words) a 'racing' inlet cam, and a 'regular' exhaust cam.

My second step "doing" the engine in my Thunderbird (after the twin-carb head) was TWO racing cams, intake and exhaust.

Did THAT ever 'wake' the engine up, particularly w/ an open exhaust!

:thumb: - :thumb:
 

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Gary "BRP"
Blue Ridge Performance

"Depending on the track, we use different combos of Versys and 650R cams. (A cheap route, is to install a Versys intake cam in your 650R, and put the 650R intake cam in the exhaust.) We have billet cams ready to grind, but until we start getting some requests, they will stay in the unground form. Proper porting & compression nets the biggest gains.
Stock rods stretch a lot faster. Not a big problem, until you start getting over 75 hp. My engine builder is currently building some flat track engines. One is a 700cc, the other 750 using stock bore/rod length, with stroked crank and custom built pistons, with pin location moved. Those should be in the 90+ hp range."

Versys (2007-201?) inlet camshaft is identical to 650R's exhaust camshaft, by the way:

Ninja 650R/ER6:
Inlet- open 31° BTDC................Exhaust- open 50° BBDC
close 61° ABDC........................close 30° ATDC
duration 272°..........................duration 260°
cam height 36.6 +/- 0.057 mm... cam height 35.9 +/- 0.057 mm

Versys:
Inlet- open 25° BTDC................Exhaust- open 47° BBDC
close 54° ABDC........................close 25° ATDC
duration 260°..........................duration 252°
cam height 35.9 +/- 0.057 mm... cam height 35.4 +/- 0.057 mm
 

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longer duration cams better for top end

long duration on both intake and exhaust (usually resulting in more cam overlap) would bring more hp at the cost of making it more peaky.

this stroker crank and pistons sounds interesting though.
 

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The cam is the best feature of the 650 engine. Buy a used Ninja if that is what you want. I think it will be cheaper than converting an engine's cam that is significantly different in performance. ymmv

Oem performance reliability can't be beat! It's hard to change a fine tuned efi engine with good results for the money and have good tune and/or reliability.
 
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