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An also two cylinder 670cc (from an NC700) engine uses a single throttle body and a single exhaust header (these are joined together in the cylinder head) - and the cylinder positioning is a lot closer to the original grom engine (almost flat, 62 degree forward leaning) also.
On the other hand it is even heavier than the CB500 motor- although I could not wind exact values.
I wouldn't use that engine anyways. When I bought my CB, I was actually looking at two other bikes first, the NC700X and the CB500F or CB500x (the two 500's are the same, just look different). I finally decided on the 500F because the engine was so much better. The 700 is super typical Honda. Good motor but super boring. No liveliness. So I decided on one of the 500's, the F in particular for appearance, and marched down to buy it. Walked out with a CB1000R instead lol. All that research for nothing lol. But that new 500 is a great motor from Honda. Any of those 500's (CBR, F, or X) are good bikes. There's already a couple CRF250L's with the 500 swap out there. Probably CBR's too (CRF250L and CBR250 share same motor/tranny) but I followed the CRF because that's what I had.
 

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Discussion Starter · #22 ·
the nc700 looked great! until i looked at the hp it only make 5 to 7 more hp than the 500. which mean exactly what goat ninja mentioned. a very boring motor and heavier. it does look like it will fit better and be easier though. im still trying to figure out exactly what i want to do. maybe they have good mods or a flash tune.
 

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the nc700 looked great! until i looked at the hp it only make 5 to 7 more hp than the 500. which mean exactly what goat ninja mentioned. a very boring motor and heavier. it does look like it will fit better and be easier though. im still trying to figure out exactly what i want to do. maybe they have good mods or a flash tune.
I've just added the info on the nc700 motor as it seems to be a slightly easier fit. In case you're looking for some non-boring light weight engine swap put in a hell raiser two stroke and smoke everything in the neighborhood. :)

I myself actually considering to buy a CB500x - upgrade with some Rally Raid stuff and ride the hell out of it during the next 10 years. I have an unlimited motorcycle licence, but looking for a lightweight all around dirt/tarmac bike which does not cost an arm and a leg to keep up and gets me to the end of the world and back reliably a few times on a shoestring. Neither the blue-white or the orange bikes really appeal to me.
 

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I myself actually considering to buy a CB500x -
Fantastic bike! You'll be happy with it. Very lively and spunky engine. A friend of mine JUST bought one a few days ago. One thing I do like about the NC700X is the "under tank" storage though. Huge storage under the faux tank. The 500x does not have that.
 
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