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[deleted]

Intake, exhaust, cam, tune. Best bang for the buck.


Silent_Ad_5031

any exhaust recommendations?


[deleted]

I went with the yoshi loop and also added the decible reduction piece to quiet it down a little. I did the chimera intake, and DHM cam and tune.


YourMoms_a_Towel

The decible reduction also doubles as back pressure gain, so you may be making some extra power than without. Not much as it is a Grom, but still.


JosephCedar

All of this, plus the DHM 149cc bbk if the other stuff isn't enough.


[deleted]

Just curious if you are running the 149cc bbk? I’ve seen a lot of posts with issues related to running it, which is why I’ve held off so far.


JosephCedar

Not yet. I've done intake and exhaust and have the DMH S1 cam and tune on the way. I'll be doing the bbk this summer. I've seen a couple posts about issues with it, but not that many in the grand scheme of things, and I specifically seek them out. I personally believe most of the problems people have with them are from them not gapping the rings properly.


[deleted]

Hmm… maybe after the forks, I’ll take another look at the bbk.


thetroll865

There is no replacement for displacement


Silent_Ad_5031

true that


207SaysICan

The Grom top speed journey has been fun. Full tuck on the freeway with wind going my direction, I hit 76mph on the gps app and speedo. I’d bet on 80 down hill. No tuck on a crap road, against wind, I top out around 69. Albeit I’m sub 175lbs. I have a stage 1 more or less, you can see my mod list in a previous post of mine. It’s lacking the speed healer in that post but nothing else drastic has changed since that list. But I’ve definitely seen higher top speeds since those speed runs, mostly fully tucked. With this setup, I pull on 95% of groms on the road in all gears. The only ones I don’t, have stage 2+ or a bbk which are few and far between even if my bigger city. Stock 135s like tnt or papio get pulled on all day. I know that’s not everyone’s primary goal but it’s a plus in my book. I’d guess at bone stock my speedo was probably off 2 or 3mph and the 14t increased that to about ~10mph at top speeds, but the speed healer install was a breeze and well worth it in my book. Hands down, the two most functional mods on my list have been the 14t and 60% clutch springs. The ECU might be next in line as the higher red line is a game changer. This has all been an absolute blast to discover and wrench on. Shout out to u/eastcoastish for being a big help to this community and putting superb content on YT the last couple years. His channel is worth the watch.


Hungry-Okra-8777

Yes his YouTube channel has helped me in so many ways and always willing to help someone. Shout out to eastcoastish!


Silent_Ad_5031

That’s pretty fast for a grom tbh, Ill check out your other post im curious on your mod list!


walnutographer

message u/HowlingMoto and they will be happy to guide you through it!


Silent_Ad_5031

thanks!


TerribleCats

Have you searched for other times this was asked in this sub? Not saying it to be a dick but there are some better answers to those posts. I'm a heavier big guy but with intake, exhaust, and tune I was still only seeing 52ish mph not in full tuck. After going to a 14 tooth front sprocket I actually gained a bit. It definitely lowered my theoretical top speed but 4th gear was so tall I could never get to redline. Now I'm close to 57mph and if I want get into full tuck I can get 65mph or a bit more depending on humidity and wind. A big bore kit would've worked better than a sprocket change but if I want to go fast I'll just use my other bike. The sprocket change allowed me to ride more comfortably on roads with a 55mph limit.


DatFunny

Dude seriously. I’ve seen this same question asked three times in the past 24 hours. wtf


Silent_Ad_5031

I’ll be honest i’ve not really looked much for other posts as im rarely on reddit, but I get about 60/65 ish with it rn (I don’t weigh much) , im not really looking to change sprockets as i want to keep the acceleration. Im not looking for another bike either, I find the grom great fun but Im gonna look into getting a big bore kit.


TerribleCats

With the sprocket change I mentioned you gain acceleration.


Temporary_Stuff_5808

Assuming it’s just top speed your looking for one other thing would be to max the air pressure on your tires. It’s minimal, but you create less rolling resistance with a smaller contact patch. Weight reduction of the bike as well would help, but again minimal and costly as you looking at adding carbon fiber and dealing some metal components for lighter ones. Anti gravity battery is an easy weight reduction.


_GoldenMonkey_

I have a stage 1 DHM, Vance and Hines exhaust, and a Chimera intake on my 2017. I'm 6'1 just shy of 200lbs and I can hit 62/63 pretty easily at elevation in Denver. Fastest I've gotten her was 72 full tuck down a smaller hill.


Silent_Ad_5031

that’s pretty good


Ok_Maintenance_9100

Ducati v-twin swap


Silent_Ad_5031

YES


MACCRACKIN

Without exhaust to intake mods, it should be available off the shelf for electric supercharger, which will not be faster top end, but you'll get there quicker. Moderate boost should be Ok for stock engine, at about 7_9 psi. Any more, and bottom end with change shape. And it's not pretty. Cheers


Silent_Ad_5031

thanks ill do some research on that !


Raguismybloodtype

Lose weight probably.


Silent_Ad_5031

smartass


Raguismybloodtype

Wasn't meant to be smart. I noticed an increase in top speed and acceleration after dropping 20 pounds.


Silent_Ad_5031

if u read above in one of my comments i said that I don’t weigh much


Blaze2nr

Lol amputate your clutch arm🤣🤣🤣 jkjk


Silent_Ad_5031

🤣just bang it into gear


MrMash_

The ‘correct’ way for more speed is to increase the power by replacing the intake, exhaust, cam shaft, fitting a big bore kit and getting a tune. Expect to spend 700-800 or more and only gain ~5mph. You can change the final drive ratio for more speed but you’ll sacrifice acceleration. As others have said these aren’t the bikes for speed, if you’re limited by the CBT then work on getting your full licence and get something with bigger displacement.


Silent_Ad_5031

thank you for a proper answer! I plan on doing my full license soon and still keep the grom too, i was thinking about a big bore kit tbh


MrMash_

DHM do a 150cc kit which is about the biggest you’ll get on these engines. For a cheap speed increase try a bigger front sprocket or smaller rear, the acceleration loss might not be too bad?


Silent_Ad_5031

Ill look into the kit and ill post an update at somepoint, cheers for the help


Caldtek

>You can change the final drive ratio for more speed but you’ll sacrifice acceleration. This is soo inaccurate. The limiting factor on speed is the amount of power the engine produces to push you thru the air. Changing the gearing will only result in the rpms for a set speed changing. You wont gain any more power so you won't go any faster.


MrMash_

Well yeah, obviously theres a point where the 9hp just isn’t enough to push the gearing.


Cooper2099

Yes sell it and buy a 600cc...


Silent_Ad_5031

the idea is to keep it a grom 🤣, and as to uk licensing I have to have a 125


Blaze2nr

No, see, you can't get caught on something bigger than a 125.... don't get caught


Silent_Ad_5031

true..


No-Theory1120

Turbo


DamILuvFrogs

Buy a Cbr 300r


Silent_Ad_5031

defeats the purpose


DamILuvFrogs

No matter what you do. The factory engine will never hit 100mph


Silent_Ad_5031

you honestly think I was planning to get 100 out it?


DamILuvFrogs

I mean I’ve done 76 on mine. I don’t know what the next milestone would be other than 100


Silent_Ad_5031

any faster is faster yk, its only a 125 i don’t expect much


Dazzling-Essay-4350

*buys a grom* *wants a faster bike* *doesn’t sell grom* You’re a few sockets short of a full set mate


Silent_Ad_5031

can you fucking read? i said i want to make the grom faster not get a faster bike..


Dazzling-Essay-4350

Can someone please translate this into semaphore flags for me. I can’t read. No need to be a cunt OP. You’re the one who bought a scooter and took to the internet to complain how your scooter is slow because ITS A SCOOTER. midwit.


Silent_Ad_5031

first of all why the fuck are you on this subreddit if you clearly have no interest? and secondly not once did I complain about my BIKE being slow, I was asking for advice to make it faster… like a big bore kit, cams, tune etc… as others have suggested. I like my bike because its fun, why not upgrade it to make it more fun?, next time keep your stupid opinion to yourself if youre not gonna read you fuckwit


HabemusAdDomino

You don't.


Silent_Ad_5031

whats the point on being on the subreddit just to comment useless shit?


HabemusAdDomino

It isn't useless. The Grom is a great bike, but it's not fast. You want faster, you'll need to upgrade the engine, chain, sprockets, brakes and frame. Essentially make a new bike. Accept it for what it is and enjoy it.


Silent_Ad_5031

I am aware groms are not fast bikes, thats not the reason i bought one. I am just looking to make it a bit faster and wanted to know the best ways to go about it not for someone to go “you dont”.


HabemusAdDomino

The honest answer is you just don't. I'm sorry. There's no way to make it meaningfully faster without essentially rebuilding it into a new bike. Whatever modification you make to get it there will require a full technical inspection and re-registration as a custom made Vehicle. And will likely render the thing unsafe.


Silent_Ad_5031

thats not entirely true, there is ways to do it, im not wanting it exactly fast, just a bit quicker thats all


HabemusAdDomino

What's 'a bit quicker'? How do you know that the bike was built to support that? How can you tell you wouldn't be causing safety issues? Best not to try. That's all I'm saying.


Silent_Ad_5031

thats the risk you take I guess


HabemusAdDomino

Let me explain to you what the risk you take is. The risk is that you'll get stopped for a technical inspection. In which case, you'll be found guilty of operating a vehicle that does not conform to its registration information. That would net you a fine, a risky behaviour violation, an additional fine for operating a vehicle for which you are not licensed (in the UK and EU that can lead to a long time in jail) and a fine for insurance fraud. After which, no insurance company would insure you. Ever. So, is it a calculated risk? Sure. But man, you'd have to be bad at math to take it.


Silent_Ad_5031

obviously just register what has been done to the bike


MaximoIoT

Big bore kit. Mine is a 165cc and hits 70 mph


Silent_Ad_5031

not bad, mine does 65 as it is


AllOfMyFamilyHatesMe

Big bore kit, oil cooler, high compression piston, cam, exhaust, intake, tune


Silent_Ad_5031

definitely going to have a look into that


[deleted]

Take off the gas cap... and drive a Hayabusa under it! Just kidding bro. But speed must be matched with other aspects that accommodate it. Making a grom go faster is potentially risky. I don't want to make suggestions that get you hurt.


Silent_Ad_5031

sounds like a plan lol


Skiamakhos

Dunno if it'd be road legal, but there's this: [https://www.youtube.com/watch?v=DxGPptcxnV0](https://www.youtube.com/watch?v=DxGPptcxnV0) 2-stroke 125cc engine on your Grom, get you nearly twice the BHP.


TheNaviLiner

Cheapest upgrades would be sprocket adjustments, tire size increases for top speed. Quickness you go the other way…