Swap Hornet cams with CBR's? - Wrist Twisters
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post #1 of 6 Old 07-30-2014, 11:23 PM Thread Starter
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Swap Hornet cams with CBR's?

Hey guys, I'm new on this page and havent been able to find any info on this topic. With that said, correct me if I'm wrong.

My understanding of the engine on my 2007 919 Hornet is that it is the same engine used on the 1998-1999 CBR900, with a cooler cam and the addition of fuel injection. Is it possible to swap the factory cams with the cbr900 cams for increased power? I'd assume I would have to have the bike tuned for this, but my main question is if it can be done, and if so is it worth the time for the extra power I'd have?

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post #2 of 6 Old 07-31-2014, 04:10 AM
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This question has come up before and I think the answer was no. Do a search on "900RR Cams" and you should find several old threads about it.

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post #3 of 6 Old 07-31-2014, 04:54 AM
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marylandmike speaks the truth -

Anything can be done, all it takes is money.

I was talking to a friend last night, I suggested a nitrous kit, for those moments when he "needs" a bump, it will be there (until the bottle is empty)

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post #4 of 6 Old 07-31-2014, 05:23 AM
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I was wondering this about the F4i and the RR while doing my valve adjustment.

"A motorcycle is not just a two-wheeled car; the difference between driving a car and climbing onto a motorcycle is the difference between watching TV and actually living your life."
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post #5 of 6 Old 07-31-2014, 06:29 AM
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It is possible to swap the cams, but it is not a bolt in proposition. The hitch is the 919 intake cam has a FI TDC sensor rotor bolted to the end of it which the carbed CBR cam does not.

If you can figure a way to weld the rotor to the end of the cam without warping the bearing journal or tap a thread in the end of the cam to receive a retention bolt to mount the rotor with a locating pin or two it could be made to work.

I know it has been done, but can't find the description from back in 2002. One thing I do remember is when the cams were swapped it was necessary to adjust the clearance on only one valve, and that one was loose before the swap was done. If this aspect is true it is a stunning testament to Honda's manufacturing prowess!


If it has already been done, it is safe to assume it is possible to do it.
On the other hand, if it has not been done never assume it is impossible to do it.
------- Rob --------
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post #6 of 6 Old 07-31-2014, 07:19 AM
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I'm pretty sure there was a thread on Hornet's Nest discussing this modification. The guy that did it did about a dozen other mods, though, so trying to wade through his thread is a bit painful. I'd dig it up for you, but I can't seem to get into my account.

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