I Doubled The Horsepower On A Honda Grom. Grom Fatherz Sucker Punch Kit ! GromFatherz

[@molonlabe9602]

I put the following on my Grom (MSX where I live) and got 17HP on the dyno: 59mm piston/rings (158cc) with jug, 24/28 valve head (ported), PCX 150 injector, pre-tuned (not to my bike but close enough) aftermarket ECU, stainless air filter, basic airbox mod (got rid of the snorkels and perforated plate), and 28mm exhaust pipe into a little higher flow muffler. And I did it all for about $200 where I live. I run 14-35 sprockets so it's a nice sounding little rocket that's a bit stubborn on start-up and for the first minute...after that she purrs. In the queue for a Triumph Speed 400 in a couple months. Have to sell my GSXS 150...3 bikes is enough.

[@Rman1100]

What's top speed? How much do you weigh? And did you map the ecu to push more fuel through pcx injector?

[@coolbananaboy5075]

WOW, that's the best I've seen. I really like the way you give the data. Thanks!

[@rivit7615]

In the 20 years I've been riding I've been rear ended 3 times. If you don't keep mirrors on a bike you're just another case of natural selection. 😅

[@onedayatatime723]

How does a mirror stop someone rear ending you?

[@thewheeltroll1833]

Currently waiting on a DHM 186 kit, can’t wait. These things are so fun and yeah I would get a better flowing exhaust. I went from a m4 exhaust to an Akrapovic ( I know a bit much for a grom) and there was a noticeable difference in mid range pick up.

[@john-martin]

I like the build🤙. Ive got a Koso 170cc 4 valve kit with other supporting mods, also brocks and a Dynojet Power vision 3 ecu. Dynod at 26whp, does 105mph.

[@DWBmotorsports]

You got video of that?

[@colbyclark2479]

Nice man, was looking at that one. How fast does it get to 100mph? You think it will keep up with like a supermoto or not quite?

[@truckacabrarex9831]

Add a turbo thank me later and call it gromzilla

[@supsurfa1a501]

😂😂😂 Riiiiiiiiight

[@john-martin]

@@supsurfa1a501 ?

[@bobanmilisavljevic7857]

The grom sounds pretty sweet and that rsx is looking super clean 👌

[@jeremycraven5856]

What does the mpg look like with the mods? Thank you for the video! Awesome stuff!!

[@thomascrownbuerger]

Stock compression is 9.3 and I believe the DHM piston is 13.2. Then on top of that I believe you said the head is decked. And you're running it over 11k rpm. And you're on 91 pump. Yowza! Hope it's running well. That's awesome you broke 16hp.

[@HunterTuned]

E85 fuel

[@johnw65]

My 6'3"- 190 lb son has an old 4spd Grom. He could go faster in 3rd than he could in 4th! So, he got a new drive sprocket that's 1 tooth smaller, and WOW! His Grom will now do 64 on the flat and 69 with a tailwind! I got to ride it and 69 on a Grom is lotsa fun!

[@Rman1100]

The rear sprocket? Or front

[@johnw65]

@@Rman1100 You read that correctly, On his antique 4spd Grom, He Lowered the gearing by changing to a smaller drive sprocket (Front) and got way better performance!

[@Rman1100]

@@johnw65 nice any other upgrades??

[@johnw65]

@@Rman1100 Just a cheap glass pack muffler and an air cleaner upgrade...

[@chrisfranklin7845]

I had a 185 big bore kit done on my 2020 grom. It’s not tuned right but still got 85 mph on flat roads. It would sputter out at 3/4 throttle so I’m sure it will go faster

[@Acestrex]

You should do a turbo on it!!!

[@Nelliott164]

I picked up a bone stock 2020 Grom SF on FB marketplace with an amazon exhaust. I have just recently done a similar upgrade on my Grom. -DHM Gen 2 H/C piston (replaced cylinder with OEM from Honda dealer) -Decha high rev cam -ported DHM stock valve head with upgraded springs -Chimera intake -hindle evo exhaust -DHM ecu flash (tuned for low elevation and 93oct) on a stock injector other upgrades: SMR 6 disk clutch with 60% stiffer springs Chimera billet clutch lifter plate oil spinner delete kit kitaco clutch cover with filter and cooler ports Koso timing chain tensioner takeagawa super oil pump mod (highly recommended!) takeagawa 4th bearing kit DHM recommended the stock injector for my build. Has seemed fine riding so far, Have not put my bike on the dyno. Pulled my spark plug and the color is right. My bike would struggle to idle after I built it and would stall. I had to adjust my air idler screw out like 2 turns on the stock TB. I'm sure my bike is pretty close to your dyno results, can definitely feel it start to pull after 6k rpm. Below that it is doggy with the cam I have. Seems like with this combination, the more RPM you give it the happier it is, and the power just maintains up high. The Hindle is very loud to the point I almost want to wear earplugs while riding it.

[@skylerstorm527]

I wonder how much this affects the MPG’s?

[@TheDonuts1234567]

that noise at about 10:10 sounded like a knock and i wasnt expecting anyone lol

[@dufus7396]

I think I would be having cranks dynamacly balanced after such mods

[@thegrumpyoldmillennial328]

Would be pretty cool too throw one of those little $200 roots superchargers on there!

[@bryanroupe8646]

Wonder if it would make the same power ? The grom stuff is pretty expensive imo.

[@dufus7396]

Im happy with mine stock..only mod Ive done..pipe and tail tidy...Im not heavy

[@rsharney1111]

We have dif bikes(yami fz09) but same mods from the same places, except for the sucker punch kit, you're good at shopping.

[@ramiretz]

you could use E85 (u got the ideal injector for it) and waaayyyyyy more ignition timing :D :D :D only an idea ;)

[@varietasVeritas]

Miles per gallon?

[@ToxicTeemoOCE]

If you put in a bigger piston, and increase the power, the stock con rod will end up breaking. Have to replace the con rod as well.

[@charlesfoster141]

Wow, this is a total top end and clutch overall. That is a huge project to do on a brand new Grom!!

[@HunterTuned]

It’s how the bike should have came from the factory! Much better and tons of fun now

[@derick12331]

@@HunterTuned How much does that cost

[@allengrant7201]

Hi Hunter. I wonder why Honda didn't give us at least 15bhp for the Grom and the Monkey from factory. I have a 2021 CB125R running 14.8 from factory. It's a capable little water cooled engine. It's got some poke and I can get away from most tailgaters. Like the look of your Acura. I have a 2004 DC5 Integra which has done over 100,000 miles. I was the first UK owner at 33000 miles and it's still practically immaculate. Enjoying the videos please keep em coming. Cheers.

[@Prosecute-fauci]

I would love to see the altitude calibration on the Dyno.

[@uniqueanartist6792]

Sounds really really good. I'll def look into their engines

[@joshuataft5541]

50 for me but i get ther prety quick been fun..inused to ride db and 600 sport bikes..got hurt bad..now im happybwoth a cool grom

[@2007farnham]

But it’s killed the bottom end and those revs will ultimately kill the motor , somewhere in between would B of been more functional

[@brido357]

How much did this kit cost with the ported head if you dont mind me asking? looking to possibly do this to the wifes grom.

[@alexmoody5936]

On the full stand next go to fuel start amd add 3 to every cell and on the bottom left cell in timing att 3 degrees

[@joshuataft5541]

I got mine 2nd hamd and the gut got it in a trade..i think mine has a engine upgrade...def has a similar exsaust pro tsper bars and white walls

[@raw_fittedz]

love the vids man i think i saw you post in a fb grom group or the full stand group

[@tonnitropartas]

Good vid, I've got the dhm piston and a takegawa type 1 cam ready to install, just waiting on a special part to arrive. Excited to feel the power difference after I install it

[@giddyrightonup]

Did you install them, and did you feel a difference?

[@tonnitropartas]

@@giddyrightonup haven't installed piston yet cause I'm frugal right now, cam has been in for awhile now. I can cruise so much easier with the low end cam. I wouldn't say it's anything remarkably insane but I wouldn't personally go to a high rpm cam unless I got money to blow

[@giddyrightonup]

@@tonnitropartas that’s great, thanks for the reply. Glad the cam has worked out well, hope you get some good gains from the rest of your upgrades

[@MikeJohnson-ld9rn]

Thanks, it was very interesting.

[@Floyd_F]

Im curious how these kits perform over the years, reliability wise. Are these still running?

[@5thgearedlined]

Has the same gauge cluster as my cb300f, that’s cool

[@prawnstar502]

grom needa come as a 200cc

[@charlesfoster141]

I like your Grom's exhaust sound much better than the Vance & Hines exhaust that came on my 2020 Grom that I purchased yesterday!

[@HunterTuned]

For the money you really can’t beat it

[@jamesarneson7769]

With my 2020 Grom with full Yoshi pipe and 14 tooth front sprocket I can get 72 mph out of my machine!

[@richs5768]

I really like the green color, I haven't seen that before.

[@mechtechau]

I'm running a Fullstand next and find it very easy to use. Hopefully you got some more time on the software and got used to it to get rid of your small issues. Nice kit.

[@domjohnson9502]

"Oh, some horsepower going down the street right now."

[@Wreckedekcoupe]

You and christine need to race! You got the driver mod but less power with the green one but shes got double the power. Its so cool that you and christine enjoy different types of motorsports together.

[@reesetaylor5366]

what did the mpg end up being after everything?

[@That_Stinger_GT5]

One of my favorite Z's tbh lol

[@Brock_Landers]

That thing sounds so much better with the cam upgrade...

[@_BlueCollarGamer]

Hey how was the install on the pro taper mini handle bars? Did you have to Re Route any cables or install any new/longer cables or was it just a simple swap out?? Do you have full turn radius with out any snags or tugs??

[@josephsaucedo8691]

Christine reminds me of my 67 sports fury dodge love the name😍👍👌✌️💯

[@Schraubzel]

Yeeeehaaa ! Greetings from Germany ! Nice one Mister :-D thank yoouuuu !

[@gromhub]

What's the reason behind no sir filter at all.... is this not just risking particle contamination? I'd also be interested on a comparison with that ECU vs an Aracer.

[@dannycastaneda4273]

What about adding g cold air intake

[@warrenpeas]

daytona 212 4 valve was not a reliable more powerful option?

[@junboloy]

Hi how much all that sucker punch kits what you show on your videos everything?

[@mike148r]

You should put vp race fuel in I have a 79 custom monkey takegawa race bike I run 91 plus vp race fuel I use for my 72 Nova and she rips response is crazy

[@aarontorrez4511]

are you from wisconsin? i thought i seen a Wi plate on the last video of your's i watched. and dealer you reccomend for buying a grom in wi? I'm in Appleton and hoping to buy one in the next couple weeks.. been having a hard time on choosing this or the KP150 mini with the honda CR150 Clone motor.

[@joh8379]

Guys... guys, there are uncountable amounts of 200cc, 300cc bikes in any power variety imaginable out there.

[@HunterTuned]

@@joh8379so? Building stuff is cool and fun

[@janmuniz955]

Was that kit designed to run on E85? The injector seems suitable and the sensor also read differently.

[@Yettee0201]

Rider weight and height can make that 70-80mph difference

[@cristinaortiz2970]

how reliable is this

[@stoosee]

what is your throttle body diameter and port diameter?

[@rattyratstuff7125]

now i need a grom cause gas prices XD the 1100 broke. 450 popped. time for a mini

[@Vleporama]

what was max spark advance on this bike?

[@kevinestrada5672]

What’s the top speed

[@Jonny_trans]

I’d be curious how it would do with e85

[@ImZene]

Sounds nice. Wow

[@chehystpewpur4754]

id race it with my moped... not gonna lie i have a soft spot for picking on these things. i wanted something like these years ago when i needed cheap trans to get to work in sunny florida. instead bought a 2 stroke scoot and cranked it up to the moon. somewhere around 22hp currently and 15:1 compression ratio. it can hang with modded corvettes and big cc bikes. geared for over 120mph and im sure itll do well over 100 but i wont go past 70-80mph on those little wheels. i wont let myself have a motorcycle cause ill break my neck on it but i am getting a supermoto soon. its more what i need anyways. 2 stroke. can jump it and on and off road legal. ill only ride it in the city spaces so it will be like a big bmx bike. and my scoot will be my fast one.

[@MrLeonightis]

Why would you take off your mirrors?

[@HunterTuned]

Cause they don’t look good bar end mirrors look better

[@enochthewitness719]

Sounds pretty nice!

[@SRTDreakeo]

Does it wheelie any better?

[@mw2freak203]

What’s the top speed on that now?

[@HunterTuned]

@@mw2freak203 82

[@TimberTrainer]

Can the fuel system support E85? The injector might be a better option for high ethanol fuel, and make more power.

[@HunterTuned]

I run e85 on both my bikes. Decapped stock Grom injector

[@jbean530]

“In fourth gear, going uphill, I kinda lose power.” Haha. Fourth gear doesn’t have power on the flats. Downhill, it’s good, though. Haha. I just use third gear uphill.

[@emkivi82]

So the shop you work at, do they work on groms? I'm in wisco too and looking to add the same kit

[@HunterTuned]

Yea call or text me 920-410-2144

[@bryanroupe8646]

Are you planning to have the black mustang out this year ?

[@HunterTuned]

Yes. Just super busy lately

[@bryanroupe8646]

I think you will have a 7 second car on a radial

[@TipsyDoughGaming]

Get the full stand next ecu working any better since this video? I have one coming from Keith from the Grom performance group. I’m hoping mine doesn’t have issues starting when it’s cold lol

[@dufus7396]

Comenters asking about economy after mods are missing the whole point

[@paulkazjack]

So why didn't Honda do this?

[@6Twisted]

Now if they did a 30hp Grom I'd buy one.

[@HunterTuned]

Check out my koso 4v video koso 170 4v makes 30hp

[@jamesmealing-gd8jv]

Ok😊

[@stevelubs]

I may have missed it. What was the end result whp?

[@islerenner]

Is 6' 230lbs too big for a grom? No rider xp, wanting to learn.

[@mechtechau]

Nah but it's no rocketship. I'm 5-10 but same weight and they're definitely quicker with a 160lb rider lol. Mods help a whole bunch and it's fun to get small gains.

[@junito1008]

Dude, you need to say how much that kit costed you !!

[@waynewelch9162]

Cutting any material away from combustion chamber lowers compression not raises. U could have done the same to your stock head by yourself lol

[@tedopsahl4908]

I wanna see this setup with a hindle exhaust and the stock injector. I want to see if you gain more out of the injector with the ecu your using I already know you'll gain on the top end with the hindle being bigger diameter

[@gromhub]

Need to try the better 4th gear from the Yuminashi guys it's changed My groms behaviour completely

[@primedirective00]

if you're making that much power on the stock bore that cam must have fucked your low end lol it's the piston windage making it run better when it's hot. All air cooled engines are like that. They can't use as tight clearances to account for a greater range of thermal expansion

[@joshuataft5541]

I like em..simular to my 17 exept ypurs are way cleaner

[@millyvee2433]

This is exactly what I’m going to do to my grom

[@thewraith6360]

Put it on E85 to take up some of that injector duty out of it

[@DWBmotorsports]

Lol that would increase injector duty cycle….. you need 30% more fuel with e85 compared to gas….

[@ChrisSmoove77]

E uses more fuel not less.

[@DriesOG]

How the reliability with this setup?

[@vrg69]

I think you should turbo it

[@armdrop101]

Still running??

[@HunterTuned]

Yep I’m upgrading and the parts will be for sale too. Recently this bike got a 186 big bore as well no issues

[@armdrop101]

I was gonna do the 186 but heard they are turds compared to 181. Also have head gasket blowing issues. Was gonna do the sucker or the 181 supposedly reliable af.. I don't wanna mess around pulling the crank and rod out be afraid stock crank would snap from trq.

[@HunterTuned]

@@armdrop101 I have a 186 and it is a turd for sure. Stock bore high comp setup like this is best your going to get on the stock crank and rod

[@armdrop101]

@@HunterTuned what tb would u put on the sucker kit over the rev wedge. Since u didn't like it??

[@armdrop101]

@@HunterTuned on the way "click" haha

[@jamesarneson7769]

Sorry I meant did you shave the head yet?

[@shootingcenter1776]

You need a evilswingarm man

[@jcf3056]

Did you ever put the stock injector back on with this setup? If so, did it run better?

[@HunterTuned]

Stock injector was not enough for it I needed atleast a pcx150 injector

[@charlesyates6687]

Put a turbo on it .

[@Buffy-ip4io]

Yes the proof is in the taste of the pudding. The low and mid range (where your nearly always at the power is way down. The driveability is gone with less than a hundred miles on it. Maybe you should get a actual engine tuner to tune it.

[@dariusjonsson2358]

do turbos work on engines that small? it would be funny to hear it spooling up even if i doesn't make more power

[@jackdewipper187]

Off course in Europe we all drive with small engines with turbo.

[@Bleezydeezy9]

It’ll work, but you need to pressurize a canister with the turbo and then have the engine fed from that canister. Single cylinder engines obviously only get 1 explosion off per cycle which makes boost build really weird if you tried to go straight from the turbo.

[@Gabriel-zr9do]

You basically made a 2 stroke

[@kevinjohnson1958]

66th from the UK.

[@johnl5573]

lol your title cut off at "...Grom fatherz suck...."

[@HunterTuned]

Perfect for clickbait lol