– (2) New 2017 Grom Exhaust Reviews: Yoshimura RS-2 & R-77S Mufflers | Grom Performance Parts –
It was only a matter of time before more and more aftermarket companies started hopping on the bandwagon and releasing new exhaust systems for the newly changed-up 2017 Grom 125. Yoshimura teased us a couple of months ago with this picture (below) that they posted on Instagram, Facebook etc. At first, I was disappointed as it looked like they were just going to use their RS-9 muffler on the 2017 Grom like they used for the 2014 – 2015 Grom.
Yoshimura or “Yoshi” as so many call them, didn’t disappoint with their RS-2 Mini Race full-exhaust system for the 17′ Grom they just announced! Another little surprise though is that Yoshimura also has another exhaust available for the 2017 Grom that you’ll see below that is their R-77S exhaust system. Technically, the Yoshimura R-77S isn’t “for sale” through distributors here in the USA so you’ll have to jump through a couple of hoops to get your hands on the Japanese spec R-77S for your Grom.
- Related Grom Blog Posts:
If you follow my blog, you will have seen I just posted an update with Tyga and their release of their new exhaust system for the 2017 Grom / 2016 MSX125SF that can be found by Clicking Here. Not trying to get sidetracked with another brand exhaust for the new Grom but wanted to mention it just in case you’re shopping around for some of the best exhaust / muffler systems available at this time for the 17′ Grom.
Yoshimura is bar none one of the better exhausts available for the Grom whether it be their old RS-9 style for the 2014 – 2015 Grom or the 2013 – 2015 MSX125. Of course sound and looks are hugely opinion based as everyone has different styles that they like and same with sound so when I mention “better exhausts available for the Grom”, I am referring to quality. We have had quite a few different brands have issues and problems with their exhausts for the Grom breaking etc due to the vibrations of a single-cylinder engine and them not designing mounts properly to combat those vibrations. If you browse the Grom owner’s forums you’ll find many examples of that happening. I won’t speak of any particular Grom exhaust problems except for the ones I’ve seen in person and I have seen first-hand a Compeition Werks Grom exhaust break (2 occassions) as well as a Two-Brothers exhaust system. I have yet to hear and or see of any problems with the Yoshi exhaust on the Grom and I have a few friends running their system here locally. Just so you know I’m not being biased when speaking of Yoshimura and their exhausts – personally, I don’t care for the design of the Yoshimura RS-9 for the 2014 – 2015 Grom but you can’t deny the quality behind them.
Honda Grom RS-9 Exhaust
Yoshimura also released their Fender Eliminator Kit for the 2017 Grom (picture below) too with the roll-out of the RS-2 exhaust. I’ve got a picture of that Yoshi fender eliminator kit below too.
Enough of my rambling, let’s get to the main reason you’re here and that is to check out the 2017 Grom Yoshimura RS-2 exhaust system… Here’s the press release info from Yoshimura:
Not to be outdone, Honda strikes back with the brand-new 2017 version of the pint sized street fun bike the Grom (AKA MSX 125). Yoshimura is ready with a performance Race Series system that will make the little fuel injected 4-speed engine come alive! Gone is the weight of that ugly muffler box, so Yoshimura performance can be bolted up!
Fresh off the dyno and out of the fixtures is our proven carbon fiber RS-2 mini system that adds torque, horsepower and less weight. Adorned with our proprietary Works Finish on the systems tubing that will give it that Ti look that’s guaranteed to increase head turns by 100%. Add the new Yoshimura Fender Eliminator Kit and you can’t go wrong!
2017 Grom Horsepower Increase | Yoshimura RS-2 Exhaust Dyno Chart VS Stock Exhaust
- Diamond-shaped sleeve
- Works Finish header surface treatment adds ti look and durability
- Large core and increased muffler packing volume means quieter operation
- Stainless steel cone end-cap
- Stainless steel header and tail-pipe
Soon to be confirmed is Yoshimura’s 2017 Grom camshaft, engine plugs and graphics kit for this mini racer. Look for the release very soon!
2017 Grom 125 Yoshimura Fender Eliminator kit Pricing:
- 2017 Honda Grom Fender Eliminator kit – Yoshimura
- Part #: 070BG121210
- MSRP: $139.95
2017 Grom 125 Yoshimura Exhaust System Pricing:
- 2017 Honda Grom Race Mini RS-2 SS / CF / SS WF – Yoshimura
- Part #: 12121AB250
Here’s a video of the Yoshimura RS-9 exhaust on a friend’s Honda Grom to give you an idea of its sound. Keep in mind this is the Yoshi RS-9 on the 1st generation Grom that’s technically a high-mount muffler and not the low-mount like the RS-2 on the 2017 Grom. The sound should be very similar though, once I have a video of the 2017 Grom Yoshimura exhaust to post up I’ll edit this post and add it here.
Now, if you’re curious about the other Yoshi exhaust I mentioned at the beginning of the article that is offered on the other side of the pond. This is the Yoshimura R-77S exhaust for the 2017 Grom (2016 MSX125SF)… As you can see the R-77S has a different header than the RS-2 that runs straight back to the low-mount muffler on the Grom / MSX instead of twirling around etc. It also has a different muffler design and is also offered in more materials including SS, CF and Titanium as well as the burnt blue’ish Titanium which is pretty cool.
Want to buy the Yoshimura R-77S for yiur 2017 Honda Grom but having problems finding a dealer in the USA that carries it? Your best friend in this case can be eBay with the links below. This particular link is for the Titanium R-77S but the same seller carries the Carbon Fiber and SS versions too.
* What is the MSX 125 that I mentioned a few times above? Some aren’t familiar with that model name but the MSX is technically what the Grom is called in other parts of the world. It’s identical to the T from the front to back except for the shape of their turn signals and then their headlight was different internally on the 2013 – 2015 model when compared to our 2014 – 2015 in the USA.
Thanks to your blog, I’ve worked out that I’ve ordered the r-77s exhaust. Do you know if this needs tuning i.e. power commander/dyno etc?
That’s awesome! Always love to hear when what I post up was helpful in some way or another. You can’t go wrong with Yoshi these days, back in the day I wouldn’t recommend them due to personal experiences with quality but they seem to have changed things up the last few years and every experience I’ve had with them has been 100% positive.
On the Grom and an exhaust with tuning etc… If you just do an exhaust, you’ll be fine but if you add anything else I would not run it without some sort of programmer to where you can throw more fuel at it. They run pretty lean as it is when stock and installing an aftermarket exhaust makes it even worse but still acceptable to where it doesn’t cause any long term damage. If you throw an intake on it or tweak the air coming into the Grom engine in any shape I’d throw a programmer on it. Even though this is a low-tech engine it’s very responsive to those little mods. On my Grom, the exhaust added 2-3 MPH up top and then the same when I added a Chimera intake as well as when I installed the DynoJet PC5 while also benefitting its overall acceleration. Here’s a link with an overview of the mods I mentioned on my Grom: https://www.hondaprokevin.com/custom-grom-125-motorcycle-msx125/ and here’s a link to all of my previous Grom posts if you want to check out some more Grom stuff: https://www.hondaprokevin.com/tag/Grom . Hope the info was helpful and thanks for checking out my site as well as posting up too.
Hi Kevin!
Your blog is awesome!!!!!!!!!!!!!!!!!!!!!
I have some questions for u. Does Grom 2016-2017 Race Mini RS-2 have db killer? And this RS-2 full system is US Yoshi or JAPAN yoshi ? Will this RS-2 full system fit with rear set??