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Grom vs NC51 Engine Weight & Dyno

This is a discussion on Grom vs NC51 Engine Weight & Dyno within the Grom Performance forums, part of the Honda Grom Garage category; I managed to weight the NC51 engine today, which comes from the 300 line of Honda motorcycles. This is a 286cc engine! not 300cc which ...

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Thread: Grom vs NC51 Engine Weight & Dyno

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    Grom vs NC51 Engine Weight & Dyno

    I managed to weight the NC51 engine today, which comes from the 300 line of Honda motorcycles.

    This is a 286cc engine! not 300cc which most people think!

    Dry weights:
    - NC51 @ 74.8 lbs
    - Grom @ 52.6 lbs

    A new increase of 22.2 lbs

    Baseline Dyno of my 2016 CBR300R was 27.94whp / 18.60wtq.

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    Where's you link for your custom grom frame for the CBR 300R engine, like to see some pic too

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    soon. I will be doing the cradle bracket configuration first and seeing how the clearances go w/out cutting the frame.

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    water cooled, 6 speeds, making more power n torque than 99% of the grom motor builds out there stock.... yeah if i was gonna do a motor swap / big budget motor build, id start with this motor as a base.

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    getting started on doing exactly this. however if you want to do it properly it is not a simple bolt in job. it requires substantial frame modification to do a good job of it.

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    the problem with 300 mods is getting the throttle body to face the correct way to get the full air-flow from the bike moving forward, all the 300 mods I've seen has the throttle body going out the side which to me restricts air flow, but that is just me. I do like the idea of water cooled and more reliability and I do like passing mod 300 on the open road or even a real CB300 or KTM 390 which I do quit often in Santa Clara and on the expressways around here.

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    I'll be mocking up the engine probably on Friday to see how it fits & if I can make it fit better.

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    Cisco, only the shitty swaps relocate the TB

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    I think the downside of the frame cradle is what I'm sure most of you think as well:
    - relocation of TB, causing fueling issues
    - have to purchase an RC1 super to adjust cold start and base fueling
    - limited sprocket sizes (making top speed horrible)

    The only plus is:
    - reversible

    Unlike most people, because I'm not most people, there's no way I'm going to chop a VIN'd frame so I'm going a completely different route.

    As I tore apart my doner CBR300R, I noticed a lot of little things that I think most of the swaps don't do (or at least do correctly).

    I'll have to figure that stuff out as I get there.

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    Frames are so cheap it's not a big deal to mess with them. Have you checked pricing on a new one?


    I don't like the idea of tipping the engine, and I especially don't like the idea of relocating the tb, and finally the chain guide bearing is ridiculous.

    If you're going to invest the time and effort it would make a lot of sense to mod the Grom frame to suit the engine. Not bandaid all the issues.

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