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Realistic Mod Expectations

This is a discussion on Realistic Mod Expectations within the Grom Performance forums, part of the Honda Grom Garage category; I've done some research but I really just wanted to ask for peoples straight up opinions, maybe from those who have these mods. I've got ...

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    Realistic Mod Expectations

    I've done some research but I really just wanted to ask for peoples straight up opinions, maybe from those who have these mods. I've got a 2017 Grom that has lots of esthetic mods and only a few performance mods. Those being: MNNTHBX exhaust, 14t front sprocket and a Chimera intake with K&N Filter. I can hit 60 mph for a split second but thats about it, I pretty much max out at a top speed of 59 mph. Im 5'9 180 lbs btw. Anyway, I'd really really like to be able to hit 70 mph. I am pretty new to all of this. My next mods are a fuel controller/power commander and a DCR Cam. In your opinions, what type of performance gains should I expect out of those two? Is it possible I could get up closer to 70 mph? Thank you in advance.

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    Do you have a speedometer correction device? If not, you're actually going closer to 63/64 already. The DCR cam is all about getting you those sweet, sweet RPMs so I'd think you'd be able to get a few more mph out of her.
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    You will get significant gains from pcv/wb2 and a cam, but you won't see 70mph on the flat from just that.

    yes it's a lot of money for not a massive increase but you will gain more acceleration and a bit more top speed.
    The biggest thing is once you have proper fueling drop a 164/181 bore in and you'll be much happier. But cruising up hills at 70? Still no.

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    you should be able to hit 65-70 mph on your stock engine once you have some good miles on your grom, like close to 1000 miles break in. If you search some of my old posting back in 2014 I was hitting 65-70 with my 220 lb weight.

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    give the motor some time to break in...

    that said.


    i have almost 5.5k miles on my grom. over 1200 of that with a 164cc bbk, cam, intake and exhaust.... and my top speed i have ever seen on flat ground is me full tuck at 67.8mph.

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    Quote Originally Posted by nd4spdbh View Post
    give the motor some time to break in...

    that said.


    i have almost 5.5k miles on my grom. over 1200 of that with a 164cc bbk, cam, intake and exhaust.... and my top speed i have ever seen on flat ground is me full tuck at 67.8mph.
    I get 75mph flat ground full tuck at around 9K revs and 70mph at 8k revs. Bike has 6700miles on it, let it break in and it starts to get looser so to speak. Bike is completley stock with free airbox mod.

    I'm 5ft 7 and 140lb.

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    Quote Originally Posted by estallings15 View Post
    Do you have a speedometer correction device? If not, you're actually going closer to 63/64 alread.
    Isn't it the other way? Going down 1 in the front makes the speedometer read faster than you're really going? If I'm wrong on this, then my Grom is hauling ass now with a 14t lol.
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    Quote Originally Posted by Old Goat Ninja View Post
    Quote Originally Posted by estallings15 View Post
    Do you have a speedometer correction device? If not, you're actually going closer to 63/64 alread.
    Isn't it the other way? Going down 1 in the front makes the speedometer read faster than you're really going? If I'm wrong on this, then my Grom is hauling ass now with a 14t lol.
    Yes, you are correct. Pre 5:00 AM post. That's what I get. Thanks.

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    Quote Originally Posted by damoC View Post
    I get 75mph flat ground full tuck at around 9K revs and 70mph at 8k revs. Bike is completley stock with free airbox mod.

    No you don't. Stock gearing and stock redline, fastest you can go is 72MPH. Unless you're falling and in neutral.

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    agreed. doing a downhill, and i mean a big one in the nc mts a few yrs ago when mine was relatively stock, gps verified mine was bouncing off the revlimiter at 72-73, pulled clutch in and it accelerated due to gravity over 76. was literally faster coasting with stock gearing/ecu. which is kinda funny.
    Too many toys? nah. 09 Ducati sport classic, 74 rd350 LC hybrid, 73 RD350, 73 Kawasaki S2a, 67 Kawasaki C2TR 120 Roadrunner, 71 Kawasaki G3SS powered by a CR85 liquid cooled lump, 74 Moto-Morini 3 1/2 strada, 84 Yamaha RZ350, 1962 Ford falcon, 76 Ford maverick, very early 1970 non-us Spec Yamaha R5, 89 Yamaha DT50 bought NEW in 2015, 2015 KTM 390 Duke, 72 yamaha CS5.. . oh.. and 2014 Honda Grom with lots of mods.. (some useful, most not)

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