Honda Grom/MSX Airbox Mod (Free)
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- Опубликовано: 1 сен 2013
- This video shows the available free modifications for the airbox on a Honda Grom/MSX125. The removal of the internal snorkel on the airbox both increases low rpm torque, as well as high rpm peak HP. The change will provide you with slightly increased acceleration and a higher peak speed.
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I just did a road test this morning with the Grom, wow! didn't expected that amount of fun! and surprisly it's more powerfull than I tought!!! love it!
Nice detailed walk through. I'm putting the MNNTHBX exhaust and fender eliminator kit on today. I'll have to join that to the list. Thanks!
I did this mod and have loads more low end torque.Only to stay safe from a broken filter,I left the mash cover on the back of the filter.I did remove the inner snorkel and left the outta one in place.Just removing the inner tube makes a big change.Also the exhaust note from my ScProducts stainless steel system sounds better,go for it,it works.
When re fitting all the air box screws, gently rotate each screw backwards until you feel or hear a click. This should locate the original thread that the screw cut into the plastic when it was first fitted, and not cut a new second spiral, then a third, then get stripped out
I have ridden in several rainfalls with the modified airbox and each time I checked the airbox drain for water accumulation. At no time did I find more than a few drops accumulated... this mod is safe for rain riding.
Best video iIve seen for removing the fairings. Thank you!
Awesome video. Thanks for taking the time to post this.
Really good video man! It has helped me understand how to remove all these stuff, without braking anything👍🏼
*breaking
Just wow, great tutorial! Very detailed and comprehensive.. thanks!! Can you make a video on installing a rev-limiter maybe?
Yes, this red connector is diagnostic, however two of the pins on it can be jumped manually to enter the ECU reset mode to "unlearn" whatever the ECU has stored over the recent few miles of riding.
Thanks for the info, I'm all for trying free mods.
Will give it a go on my MSX125 once I've had chance to run/break the engine in.
excellent video! thanks for the help! about to go mod two of em!
Awesome video man.
Thanks for the help!
just did it. The 2018s are a little different but this video still helped.
watched all this video. did this myself today altough I just drilled holes in the inner tube and took the air guard out.
bike feels a lot nicer and loads more power in first gear. I have got a full double exhaust system on it though so that might make a difference.
really good video though. you should do more x
+Joseph Edward Course (Joeyrule111) do you have a mapping device. if not are you planning on getting one
Great tutorial. They should all be this thorough...
Thx for info bro.Helps me a lot More little easy mods for groms please ;0)
Just purchased a 2016 Grom with 850 miles on it for $800. Here in SEA it's called the MSX and they are much cheaper. I like this mod as compared to installing those stand alone air intakes. I can buy pre-programmed ECU's here for about 20 bucks that add fuel and increase the RPM limit. I suspect that the ECU replacement will more than compensate for this mod and probably a performance exhaust later. Also, just today, I installed a NGK Iridium spark plug. If I burn the top end, I can replace it for about $75 here, including labor...so no big deal. BTW, this video was well done!
Where are you based, need to order parts from your area if they're so cheap
At that time there was much speculation whether the K&N R1100 would fit. I have now confirmed it does fit and I have installed one on this Grom and removed the airbox entirely.
I just removed the internal snorkel to get more air flow bought a k&n in box air filter and made a cone to shove in the opening that goes to the rubber boot inside the airbox out of a cut up oil funnel and zip tied it on to make the entrance hole into the throttle body much bigger i also ordered a cold air pipe to go from the throttle body to the air box
Very informative and interesting video! Thanks!
What are your thoughts on the Dayco 71863 mod?
Where you replace the pipe from the throttle body to the intake housing with the larger diameter one?
FYI... pretty sure the metal grating on the back of the air filter is there for when back-fires happen. I *think* in the US it's a regulation on stock street bikes to have it be there. If I remember correctly the idea was for it to help prevent the filter media from catching fire should a back-fire happen. Of course, don't just take my word for it, ask around. But pretty sure I remember that being the reason those metal gratings are found. I seem to remember questioning about that years ago.
I would have said the same as some of the other comments below, the snorkel is probably facing backward to further avoid pulling in rainwater while riding in bad weather
Sounds better, but going uphill to school it helped me out a lot. Almost went 55 haha
Nice tutorials, Dodge Rider.
Great video, very detailed.
how much faster will it go by changing or switching out the airbox?
Does this make any difference in power or just intake noise?
thanks for the video but is there any negative side effects to doing this mod
I am installing a KNr1100 filter soon. I want to remove the airbox so I can have better access to the intake valve for my valve adjustments. I had no problem removing the airbox. I am just not sure what to do with a few hoses and wires that were connected to it. Can you tell me where I should put those?
Does anyone know if it's basically the same process on the 2017's? I would assume it is because the newer Grom is pretty much the same as the older ones but I thought I'd ask anyway.
From experience, New bikes (modern bikes) have the fuel and air mixture set very lean (more air than fuel). more fuel in the mixture (richer) means better cooling a bit more lubrication and longer engine life but for the economy and fuel consumption manufacturers make the mixture more lean than rich and by doing this mod will lean it out even more possibly causing overheating and shorter engine life. Hope this helps :)
The Grom/MSX eco is adaptive and can handle small change like this or a slip on muffler. Full exhaust or big bore kits should be paired with a tune as you are suggesting.
MotorcycleProjects aren't most bikes restricted on tuning? what exactly would you need to tune for this Mod? and how? cheers
No tuning is needed for any basic intake mod like this. If several significant mods were done then you would need a computer tune such as a power commander or bazzaz.
MotorcycleProjects
if you don tune the oil cannot fit in the big air flow as i have try it, it run too lean
Tq for open up cowling and etc, i knowing better my parts, just to throw out the plate at the back of air filter, i think it would damage the air filter it self. I think the plate function was to help air filter & withstand strong air coming in. There's must be a reason honda build that. Tq
i have seemed to lose top end speed when removing the first hose
thanks for the lesson on this, i do how ever have one question thow".- So people say that moving the screen mesh allows more airflow through, but if you totalled all those holes on the mesh screen into one giant diameter, that would be many times bigger than the smallest hole from that horn behind the air filter, so why would taking the mesh screen off make a difference? because im sure opening up anything else that allready allows more air flow than the smallest restriction which is that horn will not let anymore air travell through that horn any better.
I have done the AirBox mods and also fitted an ScProducts full stainless steel exhaust system.Do I need to reset my ECM,Codes and or TPS ? Do we have a different system here in Australia/or can I use blue/green wires like in the usa?? Thanx for your help.
Hey man I just removed these snorkels and my bike seems like the torque is totally gone. I can run faster off the line than my bike. Can this be that the airbox snorkels are there to add quick fast airflow to the engine ? I also filled up 93 for the first time so maybe that’s the culprit? I’m so confused and pissed off my bike runs like crap
thank you its very interesting , in my opinion i prefer the honda grom with malossi E13 sounds fantastic powerfull and very easy to clean
Was your snorkel connected to the carb? Or is your grom fuel injected?
i just did this mod. seems to have more torque or acceleration from a standstill start.
Thats a very good job done ...Cheers m8.
I do not have a better picture of the other side of the airbox, though I know a second snorkel would not be possible. The filter sits very close to the airbox lid at the front. In order to put in a second inlet for air it would need to be drilled directly into the airbox lid. The real restriction though is not the intake to the airbox, nor the air filter. The primary restriction is the pipe going into the throttle body. Only removing the airbox and installing a cone air filter can fix that.
Surely by rotating the snorkel and drilling the front panel full of holes and even by removing the snorkel, you now stand the chance of pulling in rainwater whilst running and water can run into air filter even when washing the bike.
I guess once you get enough rainwater into the airbox and it soaks your paper filter enough, by removing the metal mesh backing on the filter your engine should be able to suck all of the mush that is left of the filter, straight into your throttle body.
I don't ride my Grom in the rain. Got a car for that.
hahaah me too!!
I did not open up my airbox yet, but I tend to believe that it is possible to place another snorkel on top at the other side of the airbox. That would combine a larger intake area with the rain-proof advantage of the snorkel. (I live in Belgium... 60% rainy wether) Do you have more detailed pictures of the other side of the airbox? Also, I'd like to know wether a non-cat pipe with the same, original damper results in better air flow.
Buenas tardes tiene algún vídeo instalando un indicador de marchas en la honda msx gron me gustaría ver gracias
What IS The top speedway before And after
What exhaust are you using?
how much was you able to get yours out the door for
Have you tried Hurricane Stainless Steel air filter for Honda Grom? I think it's worth 20 bucks.
That snorkel is meant to stop water from getting onto the engine, hence the bends and it not facing forward.
Cold air is more dense, so you can fit more of it in a cylinder. This allows more fuel to be burnt per cycle, thus increasing power.
Josh Bright I literally just learnt that yesterday watching an Engineering Explained video, but thanks for letting me know anyway.
Ah those are excellent videos!
Very detailed thank you
I would paint the walls a light to medium tan color. That way all of your cycle stuff would really pop against the lighter color. IMO
All that time and energy.... It's a good idea in theory but it would not help much. I guess if your ballin on a budget try this, but I would reccomend a cold air intake kit. It fits right on for 80 bucks and by losing the the stock air box your shedding roughly 2 pounds. The cold air intake kit will suck water though if you ride in a heavy downpour.
The 2017 grom is vented by the tube he turns forward. I didn't turn mine in case I go off road and don't want to let dirt in; being turned toward the back may create a vacuum and be beneficial. I did pull out the portion of the tube inside the airbox and used a k&n filter that is a direct fit to the factory location.
would you say that was worth it? i have a 2017 also and haven't seem many mods or feedback on the topend speed
It just surfaced you have to wait at least a year or two before you start to see mods like the last gen.
Xavier Adriano, it is worth it in general for throttle response. You wont see any gains in top speed. I suggest dropping a tooth in the front sprocket. Makes torque sooner and increased my top speed by a couple mph (due to safe higher rpms). Cant say the exhaust mod did much but it was done for sound and feels a little stronger.
Scott Lewis thanks. Do you do wheelies? And if so is it noticeably easier?
Just got my 17 a week ago and did the same. Love that honda put those openings on there. Now I don't have to worry about drilling holes.
U can buy the 1 inch mini filters and put about 3 into the Fairing and it will look Great instead of just having holes. I did it to My YamahaTTR and it looks and rides way better. U could also Drill right into the air Box and put mini Filters, Correct ?
Awesome man thanks alot I know what I'm doing today
Thank you for the info
I put an intake and exhaust on my grom and it feels like 4th gear is stupid now. It hardly has any power on 4th now. It has the room for the speed, just lack of power.
Through experience after 500miles i did a spark plug check and it was really lean. Though it gained more power with this mod plus exhaust. Id recommend getting a powercommander v and wideband2 to balance the af ratio and run s healthier engine :-)
Since I run my bike with RON98 fuel, I think I would get a good power and torque gain if the ignition would be a little bit more advanced, but i did not find a good, PC programmable EFI controller replacement (or possibility to reprogram the original) yet. (an old Motec or KMS would be a bit overkill I think :p) There is alo a red connector under my seat which is not connected to anything and seems to be a diagnostics connector??
i agree, good job
also helps to port the hole a little.
that was my video but i did not use a k&n filter it was a unifilter. the new intake along with the fuel/timing controller the difference is noticeable!
i cant wait to get my grom
what about rain and weather?
Awesome. Thanks dude. But what if you cut a hole in front of the air box and make it a cold air intake? I know that's horrible for people who ride in the rain or go off road, but wouldn't that be a great free option for Gromsters who live in dry areas like me (So Cal - LA county)?
and now, with no safety screen, if the filter media comes apart nothing stops it going inside engine to jam up throttle body and possibly wreck valves and piston. DNA makes a re-use-able high flow filter you may want to consider. DNA part number is P-H1N13-01 .
www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313.TR0.TRC0.H0.XDNA+P-H1N13-01+.TRS5&_nkw=DNA+P-H1N13-01+&ghostText=&_sacat=0
actually for dry and fair weather riding.... that open front airbox might work.... expect to clean or replace filter more often. I doubt it gains much over closed box with snorkel.
Two things. Turbulent air moves faster. Second I agree that honda has made a labyrinth for the air flow, and most manufacturers do for the reason of separation of air and water. Example, puttles or riding in the rain.
couldnt you just glue a tube that funnels into the intake on the back of the filter cover and then drill holes in the platic cover for the filter and than have an even more direct flow of air
Nice vid! Wouldn't the snorkel prevent most water to enter the airbox? Now it falls straight into the box
the video is very great.
kitaco exhaust / mini2, gonna help more torque / hp or this is just good for stock shit
great vid thank!!!
removing the tube inside the airbox would cause turbulence into the engine wouldn't it??
thx for the video, I don't own a grom but if I ever do lol...
and i am considering that the fact the actuall airfilter does need to be many times bigger because that restricts allot of airr flow too but with that many holes and that amount of surface area' it should still be more free from restiction of aur flow conpared to that first little horn, or am i wrong?
I tried with and without the mesh screen. Without the mesh screen gives the bike a little more boost! Performance first! 😋
You should be a school teacher. Great vid
+MotercycleProjects I'm completely new to motorcycles and have a question.
If i do this mod in the near future when i get a Grom, would that be illegal because of the reason that the topspeed is altered with 2 MPH?
P.S. this is prob a dumb question xD
Not in America, I don't know about any other countries. As long as you have the proper license to ride the bike, there's no worries. Point of referrence, turbo kits and big bore engine kits for bikes are street legal.
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I bought got a k&n airfilter to replace the stock filter. Is the K&N filter better than the stock ?
SnapBack Yes much better
Do you have your Grom yet? They are a lot of fun to ride. I'll be posting a detailed oil change change video soon including how to clean the oil screen and spinner. Check back and subscribe so you don't miss it.
Have you tried putting the intake tube on the insides to give the air more directional flow
I assume you are referring to the tube on the outside and placing it inside the airbox to feed air directly towards the filter? Though that would direct the intake air more quickly to the filter, the design of an airbox works on a different principle. As the engine needs to pull in air during an intake stroke it pulls the full 125cc of air. This creates suction in the airbox. The smaller an airbox is, the harder it is for the motor to pull in that amount of air. Companies have found for decades that the larger the size of the airbox, the better power and throttle response and engine will have as it isn't wasting as much power trying to draw in the intake air.
With your suggestion about directing the airflow that would only be helpful in a small airbox where it was designed for high RPM power only, perhaps like a Formula 1 engine where laminar flow is necessary. (Google laminar flow) In short, it means that the nature of the intake pipe plus the high speed of the incoming air will have momentum and the intake pipe would be shaped to achieve a slight compression of air as it enters the airbox. Though the principal is sound, it's not practical on the Grom or even 600cc supersport bikes which run near 20,000 rpm.
In the case of the Grom, the only way to remove restriction on the intake side is to ensure the airbox volume is large with a high amount of filter media. Further restriction can be removed by installing an oversized cone filter directly onto the throttle body and removing the airbox. Even with this modification the power increase is only slightly noticeable. These types of modifications make small differences to an otherwise stock bike, but later when we have Big Bore kits available they will play a greater role in maximizing the power output of these little engines.
Thank you
i use k and n air filter install directly to the carp, no air box, and wow power increase a lot, however you need setting to more richer as this done by my mech, as my mech test ride few time and keep resetting, not easy job
Turning the snorkel can cause some water to go in to the intake,,,becafull ,damage can occur,,,,
If you really want to mod that air box and get the most out it, why not just cut a hole in the drivers left front of the air box "LID" and create a ram air effect from the front giving you even more power! I would even go one step further and seal the original snorkel hole at the top rear of the box so it only breathes from the ram air hole cut into the lid, creating an almost supercharging effect! And you can make that hole as large as you want to!
do you have to frequently change your air filters
almost clean at 10.000 kms
I pull the snorkel out too.. Thug life!
me to. awesome! now it actually groms... and a little bit more power in 2nd en 3d gear
I got my grom for dirt cheap because the guy did this mod plus drilled like 8 holes in the air box cover and it made it not even start I put it back to stock and plugged the holes in the cover and it fired right up did 60mph then took only the inner air tube out from inside and topped out at 68 to 70 bouncing back an forth and I weigh 215lbs so I like the intake mod but only with taking out the inner tub and that's it.....it made a difference and is still safe from rain and dirt
Jerod Dull 215lbs and 70mph? Does it have a hidden turbo you don't know about too? Gonna need proof. Link me to your video.
Kevin Trombley I know right i weigh less than him and i spent 1000+ dollars on performance mods and lightweight parts and i still can't get past 64 mph lol
@@10klotterywinner29 I weigh almost 190 pounds and my Grom (MSX) is all stock and I topped it out at 107 kph (66mph). I'm going to start doing some simple mods, like this one (just remove the inner tube) in the video, a pre-programmed ECU available here for $20 and I just installed a NGK Iridium spark plug. Hopefully I'll get some noticeable difference. Maybe a performance exhaust down the road.
@@molonlabe9602 Yes and I suggest the Yoshimura with to spiral pipe like mine it has a good deep tone!
whatever how you modify the air filter, carp, or whatever for more power there is a maximum speed which is set by the factory, and it will not exceed the maximum speed, unless you use power commander to reset the maximum speed
Yuminashi also makes a stand alone aftermarket ECU that has two engine governor settings. I am not sure that I would recommend extra rpms as a routine...unless engine life does not matter to you.... Piranha 190cc Daytona 190-4V engine is a carbureted no-computer, kick start-able, 4-valve racing pit bike engine that will fit on Honda and others. wholesale-cycle.com/product/ST-3094/Piranha-Daytona-190-4V-Pit-Bike/
planetminis.com/forums/wholesale-cycle/185170-piranha-190cc-4v-pit-bikes-stock-see-video-here-worlds-fastest-pit-bikes.html scroll down for "as of 2013" engine price. $1049. US dollars.
I would drill about 8-10 holes into front and bottom of airbox for fresh air
what if it rain?and also does it work with 2016-2017 grom?
there is a higher chance of water getting in but there is a drain whole in your air box so your fine....my grom is 2016 and it works...2017 should also work
Brad_3307 A 2017 and a 2016 is the same thing because i bought my 2017 in 2016 cause they didn't make it till about august of 2016 and fun fact if something is made after 6 months of the year it is considered next years model! Haha so in theory a 2016 honda grom doesnt exist cause the 2016 groms information in a dealer says 2017 lol
If you remove the little white cap below there it will give you more Air instead of doing all of that
i value your opinion and would like to know, if i go K&N plus freer exhaust is there any possibility i with cause damage as a result of being too lean. You have probably answered this well but i am unsure Thnx
you will have to play around with the jet and idle mixture screw,run it too lean and you can burn a hole in piston.keep it stock as honda intended.50mph is about as fast as you want to go on a 125 if you keep pushing it for speed your just kill the motor over time.
***** ORLY? Where are those screws located?
screw underneath carb towards engine or the rear will be mixture screw and on the side of the carb is the idle adjuster
***** You know this is EFI, right?
TerryMMA Its fuel injected bro lol
This is with stock exhaust.
Do you need to do carburator settings after this ?
*****
OK Thanks ! :-)
Raphael Lotufo It's fuel injected tho and no it adjusts itself enough for this mod
why don't you just drill a hole in the front of the air box so the air has a direct feed to the filter?
That would allow water to saturate the air filter when riding in the rain or through large puddles.
nice
the tube is for top end. honda knows what they are doing...
this mod might be improving response.
The best part is that this is reversible. So far, every single Grom owner on the forums who has a Grom capable of 65+ mph speeds it has required modification to the airbox (or replacement with a new intake such as the K&N R-1100 filter pod) as well as a change to the gearing or exhaust.
long tubes generally are intended to provide more torque at lower RPMs
+Mudux You do lose torque at lower rpm's but get way more torque and hp at mid to top end with a mod or k&N pod going by a dyno.
IRideA Grom I know, I was just correcting the OP.
Just remove the front cover completely