Is Your Grom Running Lean?
ฝัง
- เผยแพร่เมื่อ 21 ก.ค. 2020
- In this video I discuss the relationship between modifying air intake, exhaust and how it affects air-fuel ratio, when you need to adjust the AFR, different ways to adjust AFR, and pros and cons of each way.
Products discussed or shown:
Intake Systems:
Chimera Intake (I use this): amzn.to/3eRI5pJ
Dingerbuilt Intake: www.dingerbuilt.com/product/k...
Exhausts:
Yoshimura (I use this): amzn.to/32JqCxb
Special note: if you have an OG you'll need the adapter: tstindustries.com/tst-low-mou...
Zoom Polygon Exhaust: Not currently in production
Standard Zoom Exhaust: amzn.to/39iREwG
DHMotoring ECU Re-flash Service (I use this): www.dhmotoring.com/products/s...
Dynojet Power Commander 5: www.amazon.com/gp/product/B07...
Dynojet Wideband 02 Bung: amzn.to/32KUVDV
Dynojet POD-300 Display: amzn.to/32H3G1L
Aracer Mini 5: amzn.to/2CuluTa
Cheaper AFR display option: amzn.to/39okpZ4
special note: This does not AUTOTUNE your AFR, it just displays your current AFR in real time in all throttle positions, where the dynojet actually AUTOTUNES the AFR. - ยานยนต์และพาหนะ
I only watched 2 videos, this being the 2nd. You have an amazing personality man. Your just so relaxed and such an honest dude. I love your vibes and how clear you are when explaining things. I stay in Houston but you have totally got me in the Grom game.
I appreciate that, those are big compliments, thank you. I try hard to give concise and HONEST information. I know there's a grom scene over there, hook up with those guys and go on some group rides! You'll have a great time!
I agree. I've watched quite of few of his videos. I hate going on some of the FB groups. So many people are a holes and give people the wrong info or trash talk.
What a great video - I have a Kaw z125, but learned a lot from this video.
After watching your videos I'm probably going with intake, exhaust and just a flash. No more than I'll be riding and where I live, this will work best for me
Just made my grom cheaper and cooler keep doing this bro I don’t anything about groms
Well keep watching, I'm glad you're finding value in the content. Thanks!
I thank you a lot I've a grom 2024 abs but I want more speed and power and you got me these good advice!, fever!🔥
Definitely going to do the reflash for my case.
Do more videos like this!
Awesome, glad that it was informative and helped you! I'll do that!
Thank you for your honesty and guidance. It made my decision clear on what direction I needed to go. You also hit me up with some knowledge.
Literally a video everyone needs to watch
Hey new subscriber here. I really like this channel. I don't have a grom at the moment but I'm planning on picking one up soon. Your vids have been very helpful. Would you consider doing a vid on your friend's bikes who might have different mods to show other options. Thx for the great content. 👍🏽
That's awesome, I'm really glad you're finding value in my content :) I did do a video like that once. It's here: th-cam.com/video/7CzdwCMe9TE/w-d-xo.html
@@CTGromer cool. Thx. I'll check it out
I've been planning on getting a grom for the past month but the dealer wasn't getting any in until august. I definitely want to mod it so I've been looking at a lot of different parts and videos, including your old ones, and making a list. This is one thing I wasn't to sure on so thanks for the videos!
That's awesome, I hope you end up getting one this month! Let me know if you do. I'm glad that you're getting something out of the content!
check out my 2018 Grom on my channel , its Matte grey metallic.
Great vid, CT! Definitely helpful.
Glad it was helpful-that's the goal of the channel! Thanks for the comment!
Great Channel. Content worth watching!
You're the man Arron! I appreciate you.
Another great video I’m actually at the gas station with my grom taking a drink break…watching your video..quick question is the price for an ecu reflash to have your own ecu re-flashed are is it a new ecu flashed if it’s your own what’s the price difference to have another ecu re-flashed to be able to keep the stock ecu?? Thanks for your vidz I’m highly mechanical I’ve built airboats swamp biggies and mud trucks anything to do with off-road are bass fishing I’ve done it but these little mini bikes motorcycles in general are new to me I do have electronics on my newer quads but don’t ever do much to them besides replace parts when they go they have plenty of power…but driving to save money on fuel for travel and needing more power for higher speeds your videos are great I’m top speed wide open at about 64mph right now fastest I’ve had it is 67mph I’m 6’3” 210lb and travel with a backpack that probably weighs 30 pounds at times gives are take..just so use to 4x4 stuff and so much storage space..trying to get it into the mid to high 70s without doing anything to crazy in the internals of the motor I wouldn’t mind putting a cam and a few other basic things would rather not go bigger then about 185cc on a bbk if I have to..thank again…
i think you should do alot more videos like this ! where you talk infront of the camera, gives you more personality on the channel !
I appreciate the feedback! I just may do more this way!
I like your video. I have some suggestions. Get your microphone as close to your mouth as possible. The room has lots of reverb and with the mic closer the viewer will hear less of it while your audio improves dramatically. Thanks for the info too.
I appreciate the advice, next time I'll get it right up close!
Just what I was looking for, thanks! I just need the re-flash.
Glad to help!
Nothing much to say ....sound info. you nailed it to a T. Even here on youtube you see so many people put on aftermarket exhaust and wonder why the bike don't run that great. Then expect a fuel controller to fix the problem to no avail.
This is all true, I'm trying to stamp out ignorance and stupidity!
I am going to do the DHM stock air box insert and the 80$ Amazon exhaust and I fall into the category of people that the red lash will not be that important especially since it’s just a “filter change”
Any suggestions as to where we could send a UK ECU to in the States to get it flashed fella? Don't think we can get it done over this side of the pond sadly! Thanks, and love the channel. Sub'd! Edd
Thanks a lot of the sub Edd, I'd send it to DHmotoring, I believe he's down in Florida here in the US.
how the heck do you only have 6.9k subscribers!? I thought you had like 100k... im almost at 3000 subs
I don't know man, lol. But I'm getting more all the time! I appreciate the compliment though, maybe one day I'll get to 100k! Just checked out your channel, you put out a ton of content!
Excellent video. Question about running too lean, what does that sound like? I bought mine with all those mods done to it, including PCV +autotune, so I don't know if what I hear is normal or not because of that.
It's not something you can necessarily "hear", but if you have the PCV and autotune wideband o2 bung then you're good to go! Its the best setup, but the most expensive for sure!
@@CTGromer Gotcha. Must be something else going on, then. And I absolutely got a hell of a deal on it. The mods alone probably cost more than what I paid for it.
CT Gromer, you didnt mention the EJK brand instead of Power Commander. Do they do work good?
To make clear the EJK or Power commander, would override the ECU settings from factory to allow to run richer?
Thank you
EJKs will work, but they seem to be a bit ambiguous to use. It's just sort of a guess and check method. They're cheaper, but more cumbersome than a PCV, but the PCV is designed for you to use all of the add-ons and extra modules. the EJK is JUST a tuner. Yes, both EJK and PCV will override stock map on ECU to richen mixture.
Hi I’m a new viewer and have to agree with most of the comments/compliments great job explaining things along with your honest advice. I have a zoom high mount full exhaust and ripped out all that restrictive tubing in the air box and installed a K&N filter, I converted my 2017 SF Grom into a dual sport so when going on trails especially high altitude hills it struggles on 2nd so I bought a PCV and plan to use the yoshi full exhaust stock air box with no lid map. My question and now my concern is will this Dyno PCV be a good addition and did I pick the right map choice (my specific map is not available)and how likely will it strand me too, deep in trails? Thank you so much in advance for ur time!
Hey antonio, at what altitude are you riding the grom in the trails? The premade maps online will make it run more rich at 3/4 to full throttle. They won't make a lot of adjustment for altitude, so you might just be more rich. If you're under 6,000 ft or so it should be fine.
@@CTGromer Hollister Hills in CA so I think 6K’ ft is about right so that’s good to hear also you mentioned the PCV failed you by not starting your bike how did u fix it, was it as simple as disconnecting it and reverting back to simply using the ECU?
@@antoniochacon7985 Yes- that's all it was, the PSV module had failed so I just took it out and plugged that giant wiring harness directly back into ECU and it ran like normal. PCV did replace the unit for free and I ending up just selling it to a friend.
@@CTGromer so I just installed a high mount zoom exhaust (like on ur video) onto my 2017 SF and of course opened the air box up by removing all that tubing and added the K&N filter and closed it up (no pod style) and I just installed the PCV and used map 16-049-005 (two bro exhaust with stock air filter) per Dyno tech recommendation only to find out it’s from a 2014 Grom not from a 2017 uggghhh u would think they would update these maps on their site, anyhow bike fired up and idles fine have not driven it yet so not sure how it will perform at the higher RPMs since I do see the preprogramed variations +7, -5, +6 etc etc for the fuel and ignition tables, however I’m hesitant to ride it because the map is for a 2014 model u think this is going to be an issue when I take it out on the highway and open her up to those higher RPMs?
Great information, I have a 2022 honda monkey that I have done everything to. pipe,intake,cam,149cc bbk,150injecter oil cooler and 2 dhm ecu reflashs! The motor is running hot. will the wideband cx single channel afr kit fix me up? can I use it by itself or do I need a power vision 3 also? I want something simple !! thanks Mike
Im 66 years old and not very good with computers!
Hey I'm a pretty small chick and thinking about getting a Grom as a first bike. I'm taking the motorcycle safety course soon and I was wondering about what the best safety mods are for the grom? I was looking into sliders but I was wondering if you recommend anything else. Also any good travel mods like storage that doesn't drastically effect the speed and control of the bike?
A grom is a great first bike for a small framed person for sure! As far as safety mods go, axle sliders, upgraded handlebars go a long way--stock handle bars bend very easily and have a narrow and swept back grip. As far as travel mods go, a variety of companies make rear racks for the grom that you can mount a tail bag to. You could also look into a good quality "tank bag" for extra storage. Neither of these will significantly affect the handling. Good luck!
If only changing intake and using stock exhaust do you still need to flash your ecu?
I’m pretty new to this and I’m planning on getting a exhaust and a intake for the grom. I’m kinda confused on the ecu reflash. If I get the ecu reflash it will work for any exhaust and intake right?
Yes, it will. I'd recommend the Chimera intake, but any aftermarket exhaust will be more free-flowing than the stock one. The ECU will richen the mixture enough so its not dangerous. Depending on who flashes it, someone might have an EXACT tune for your specific intake and exhaust, some just make a broad tune that will be safe to run. Hope this helps.
Big question in my mind: If I open my Intake/airbox... what happens if i get caught out in the Vermont RAIN?
I’m getting the ejk tuner for the 18 Grom do you know anything about what settings I should put it on full throttle or accelerate idk if you know just wondering
I don't know any good settings on that thing man, good luck.
Hey could you do a video on if a motorcycle course is necessary/beneficial, or go self taught?
This is a pretty good idea, yes, maybe I'll do that. I appreciate the suggestion!
CT Gromer thanks! I’m planning on getting my first bike soon either a grom or rebel but I’m not sure if I sure take lessons first or just go for it.
CT,
I’m a Grom owner. Very old Scooter rider in that I’m 76.
I simply want to increase speed so I can comfortably run between 55-65 mph. My thought is to simply change gearing ie: 16T Front/32T rear sprockets.
Since you are a Grom Guru what are your thoughts?
Tnx...
Hi there, 76, thats awesome! Glad you're still riding! changing the gearing to 16-32 won't increase the top speed in the groms stock form as it simply will not have enough power to take advantage of the taller gearing. Leaving gearing stock and increasing the power is what get the grom to 55-65mph. The gearing is not the issue, its the power.
If you flash the ECU with DHM or CJR, what is the process to go back to stock configuration?
Anyone have any experience with the EJK programmer?
thanks pal so don't need 2 do nothing 2 the ecu when just did exhaust?
You're welcome, I'm glad you're enjoying the content. Correct, no further action is needed in adjusting the AFR if all you're doing is exhaust.
I love my 2020 Grom, but don't use it a lot.
I've purchased the Toce exhaust and I'm deciding between:
a. Dingerbuilt or Chimera + exhaust + DHM ECU setup
b. DB/Chimera + exhaust + cam + DHM ECU (intake/exhaust/cam) setup
do you recommend the cam? I just want to unblock the way it comes from stock
dude I HIGHLY recommend the cam. Its the biggest single change I've ever felt on just one mod. I actually reviewed DHM's CAM package a while back: th-cam.com/video/t7xqQPafvF8/w-d-xo.html
@@CTGromer Thank you bud- I did however go with the dinger built mid-length intake + CJR tune...for now... Cheers
@@gmartinezfuster All good man, Dinger is a good intake, I just don't have any person experience with them, but theres a reason why they're popular. Enjoy!
So if im just doing the intake and exhaust then a re flash is my beat bet correct or should i do the dynojet v ?
I would just do the re-flash. Much cheaper.
Understanding how air/fuel changes with mods is the key. The missunderstood part of the equation is the back pressure needed. The aftermarket exahusts are wide open for the most part and have little to no back pressure.
Thanks for the info Ryan, and for always watching and supporting!
That's why yoshi makes them in a loop
I'm going to get a dhm flash for my dinger intake and zoom loop exhaust. Is it ok if I ride it around to test it a bit with no ecu flash yet? I'm new to all this
If you don't ride it a bunch, it should be fine. Don't hold it wide up for 2 minutes at a time, and not a on a super hot day either. Definitely do the ECU though!
Hello,I bought a pv3 and weird enough after putting my takegawa exhaust I flashed the recommended tune and the bike was slower and loosing top speed and the bike was feeling sluggish,I reset the tps and stuff like other explains already...so I bought a chimera intake and the bike waken up a bit but was so much looder the cops in my city a used to electric cars and the moment something is different they will pull us over ....
So I have a 2024 grom. Everything is stock other than my yoshi full exhaust I just put on it. Do I need to do anything to my ECU or am I safe for now?
Hi, Does anyone map the 2022 euro 5 groms? And is it safe to change just the exhaust without a map on a euro 5 as the euro 5 runs even leaner than the euro 4 engine. Thanks
So just out of curiosity, you said with just an exhaust, you SHOULD be okay, is there anything you need to be wary of? I'm looking at getting a grom in the next month or two, so just wondering... Thanks!
Hey thanks for commenting! If you don't modify the airbox and just add exhaust, the ECU can make that adjustment and it won't be too lean to the point that you're risking the engine overheating. If you were to do the intake AND exhaust, you would want to richen the air-fuel ratio by flashing the ECU or adding a fuel controller of some kind.
@@CTGromer That's good to hear! Appreciate you getting back. Even though I just found the channel, I really like the stuff you do here on TH-cam!
INCORRECT not the same. Power Commander is a piggyback system and Aracer is a standalone ECU that has full control. Night and day difference
My bad, thank you. I don't have any personal experience with the Aracer. ignorance on my part.
If i come over will you make me a cup of coffee again i havent had coffee that good since last time
Of course Karter. Anytime
Reflash vs Reset? Whats your opinion?
Okay dumb question, I plan on doing the intake and exhaust and reflash. Would it be dumb to add the aracer with the reflash? Eventually I'm going to do the high compression 125 piston...
If you're going to the reflash don't do the Aracer. If you get the flash from DHM and then get his hi-comp piston, he should cut you a deal do reflash it again.
@@CTGromer I want the an ecu with quick shifter and the popping out the exhaust tuning
@@FatKidatSpeed Both Acerbis and Dynojet PCV can do that!
I would like to ask my Grom 2018with intake cam and yoshimura what is the best for my Grom power commander or dhm ecu reflash ?
Ali Al Doh hey bud, do you plan on doing any other engine mods? If not, the ECU flash is the cheapest best option! Thanks for commenting!
CT Gromer hi thank you for replying.no I will not do anything more.thank you again and be safe bro
Ali Al Doh if you go the dhm route they update it every upgrade for free
CT Gromer hey bud I bought ECU cam tb and yoshimura rs_2 exhaust and Air intake And I’m happy 😃 for daily use
Is there a reason to bay oil cooler or that's enough
I am thinking about buying a 2020 Grom and it has 5,500 miles and he says that after he put a new exhaust on it, it had less power. Any idea what the problem is or if I should buy it? It’s 1500
I'd snag it for that price, what exhaust is on it? When you put an exhaust on, it takes 50 miles or so for the ECU to make an adjustment, during which time the grom is slower. If you reset the ECU (which you should) it takes around 20 miles for power to return as the ECU learns. That's probably what's going on.
Awesome video. I recently bought a used 2017 grom with full yoshi and chimera intake. I found a video on how to reset the ecu and TPS with paperclips.. Is that equal to sending my ECU in to get flashed?
Hey congrats on the new bike! Unfortunately no, resetting the ECU and TPS is not the same as having the ECU flashed to compensate for freeflowing exhaust and intake. I'd do the re-flash!
@@CTGromer thx man! Exactly what I needed to know.. as of now it runs ok based off the spark plugs health. But I'm going to send my ECU out to get flashed for my specific set up soon. Keep up the awesome content bro!
Hey have you seen the new 125cc Wolf Striker?
I'll have to look it up- I've not heard of it!
I know it looks exactly like honda grom 2015
Ct gromer if I have an exhaust and the simple stock air box mod for more air do you think I’m running lean and need a Ecu reflash?
What did you do to the airbox? I've seen people remove the internal snorkels and add a "velocity stack" inside. Is this along the lines with what you did?
CT Gromer thanks for the response. I took out the middle snorkel inside the box the one held by the steel piece and also remove the steel piece in the back of the paper filter for more airflow.
I have an eu grom (2022) with the different ecu and no sites that offers ecu remap or replacement. Anyone here with a eu grom with a power commander or power vision?
Hey serious question what kind of grom seat should I get? To be honest I don’t have a grom yet but I want to get all the parts I want first and put them on when I do? And where should I get the parts from?
Hey Christian, that's one strategy I guess! I buy most of my grom parts from TST Industries, Steady Garage, and Amazon. Good luck finding a grom!
@@CTGromer thanks for the response
@@christiancabrales44 Hey Christian- you're welcome, good luck!
i just put an aftermarket exhaust on my grom & i reset my ecu... my air intake is stock. Do i have to do anything more? Is it better to keep my stock air intake with aftermarket exhaust or is that something I should change.
You're good as long as you don't modify airbox or add air intake system. Once that is done, you'll need to reflash that ECU
@@CTGromer thank you so much !
Are you from Connecticut and what is the first thing I should do to a Grom it’s my first bike ever I’ve never done nothing mechanically in my life I’m 13 it is to ride in my property what do you recommend
Hey bud, I'm from California, the CT in my name refers to the CT90 or Trail 90, which was my first bike. First thing to do to the grom? Ride it! After that, new handlebars and grips, remove the rear fender, and get an exhaust. That's all it really needs :) Let me know if you get one!
CT Gromer ok thank you I’ll let you know if I get one
I have takegewa 143cc bbk, exhaust and intake can i just do the reflash?
Yeah, go to dhm they do it cheap
I'd ask DHM if he can make a custom flash for your exact scenario. When doing BBK i'm partial to doing the PCV with Wideband o2 auto tune.
Will it be okay if I run it 2 weeks without the ecu flash?
Yes, as long as it never gets super hot, from things like prolonged wide open throttle or stunting, should be fine.
Does most grom mods work with a honda Monkey?
No, I don't think so. The engines are very similar, but I don't think a lot of the mods are universal.
You can also use an another ECU if you mod the air intake and the exhaust. For example the Yuminashi ECU... Its cheaper to.
Sry for my english :)
Ahh I'll check this out! Thanks for the info!
More air also needs more fuel.Take injector out and replace with Honda Pcx150 injector
I had not thought of this, on my own bike, but I will look into it. Its a cheap part, might as well!
Hey ct_gromer! My buddy and I are getting in to groms. I think I heard you say in one video that your in central california? If so we should link up and ride.
It's an awesome investment! Yes, I live and ride in Fresno, we have a good size group that rides several evenings a week and weekends too! Congrats on the groms!
Awesome man! We'll have to make the drive over there sometime. We're by santa barbara. Thanks! Definitely so much fun so far. Do you have an instagram?
@@joeyanderson8231 We'll make it worth the drive, I'll let you know next time we have a big ride here! yes, I have an instagram - @dsimon11
I just bought a grom with a big bore. i put the bigger injector in and have a power commander v but no oil cooler and no downstream o2. how boned am i to run it like that for a little while? I have the ability to add an oil cooler, i just dont have one installed yet. when cold(er) and under load i have noticed some black smoke out the rear which makes me think it might even be running rich
Which BBK your running, and what map are you running on the PCV? Black smoke could be rich AFR, yes. Let me know.
@@CTGromer for whatever its worth i bought it with all this stuff on it. it was too good a deal to pass up on. I wanted a stock one but eh.
its got a TB bbk. I havent gotten into the power commander yet. I should really read a how to on it and get a new map for it. it does have a bassani exhaust and some intake with a cone filter.
the bike still had the recall from 2015 on the fuel pump so I havent had a change to dig too far into it yet.
@@Ericbuyslunch Ahh so its an OG grom! make sure you get the fuel pump recall done, I've had to do that on two of the groms I've owned. Honestly, you're probably good for now, but when you get a chance, get it mapped by someone who does it, or buy the autotune module.
@@CTGromer yeah. its at the shop right now getting it done as california wont let you register it without it. hence why i havent ridden it hahaha. the previous owner was seriously an idiot. the front brake cable is ran backwards and out of its holding points.
a friend of a friend has a super nice grom dyno. people bring their bikes to him from all over to get tuned is what ive been told. ill have to ask him for pricing. i do intend to get an oil cooler soon because you can never overcool hahaha. but i just dont wanna blow it up, especially with that 186cc kit. ive heard mixed reviews
@@CTGromer been riding it the last few days and it rips pretty good. no real complains. Kinda bummed it tops out around 60 with me on it, but i am a big dude. Just thought id get a little more out of intake, exhaust, BBK, and power commander v. Chances are it needs a tune though
SOMEONE PLEASE HELP I RECENTLY BOUGHT A 2017 GROM THAT HAD A CHIMERA INTAKE ADDED AND AN EXHAUST MOD. It suddenly shut off mid ride and will not start now I’m almost certain it’s the piston and rings. I just lost my job and have no transportation until I can fix this problem. You mentioned a $150 rebuild. Please respond
www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313&_nkw=Honda+grom+top+end+rebuild&_sacat=0 good luck bud, how certain are you that its the top end?
@@CTGromer finally pulled the engine apart and sure enough it was the piston and rings. Thank you so much for the help
Man I want a grom Soo bad
Grab you one!
@@CTGromer I wish I don't have the money
@@bigmike3189 save big daddy!
@@CTGromer I'll try
Couldn’t you just install a bigger injector or no?
Any company that re-flashes the ECU in Europe, anyone?
Good question! I really don't know. DHM cant chip one to you?
@@CTGromer too much hassle, with shipping costs and costumes/taxes
going with a cheap amazon exhaust and open air box mod….ecu will adjust itself. it’s nothing big so it probably won’t do anything. save the money and buy another mod😎
What up bro.
I have nice grom
You have club
I’m fresno
Yes we ride all the time here in Fresno, add me on Instagram and hit me up @dsimon11
Don’t think anyone have ever blown up a grom from doing an intake and exhaust.
No, but the clean condition combined with other factors such as a slow climb up a hill, low oil, and lean condition will certainly overheat the engine and cause a significant amount of premature wear the tear. It's all about eliminating wear factors.
My grom sounds more akin to the pneumatic engine out of an air compressor than a motorcycle stock
I remember how a stock grom sounds, I always compare it to a sewing machine. Have you modded it yet?
CT Gromer lmao no mods yet but a tuner in the mail. After that I’m probably just gonna lessen the air box restriction and maybe slap a cam in
@@Quincy_Faulvius Let me know how you like all that stuff!
The power command is a complete waste of money. All you have to do is reset the ecu. It will relearn and do exactly what the power command will do.
Your info on fuel injection and running lean is all wrong. Your idea that the ecu can only adjust a little bit is hilarious. Fuel trims can adjust up to and often beyond 25%. There is no way that either a filter or exhaust gains 25% or more at either end.
Although it is sensible to have a proper remap done on a dyno once all hardware mods are done.
One thing that has me baffled is all this concern around these bikes running lean?. Unless there is something about these injection systems that I don’t know then these bikes should never run too lean or rich ever.
The fact it has fuel injection, an ecu and has a lambda sensor takes this running lean or rich away. Regardless of whether the ecu has a manifold pressure sensor or not the lambda sensor will detect rich and lean conditions as that’s its job. If it detects a lean condition it will adjust the fuel trims to compensate accurately and over time memorise these settings. That’s how fuel injection works.
Also, only if the fuel trims go over 25% +\- will the CEL come on. There is no way that either an intake or exhaust will create more than a 25% gain of air ingested or increase in exhaust gas speed by 25% so the standard system should cope just fine with both mods.
Everything runs towards the side of “leaner” from the factory simply to appease the tree hugging twats and government legislation.
Lastly, these bikes are equipped with catalytic converters, the square like box part of the exhaust in the middle. For a catalyst to work and not be destroyed we all know they constantly cycle from rich to lean all day long or the cat would die soon enough due to all the unburnt fuel.
Anyways, happy gromming to all 👍
Leave them STOCK. You will have no problems. All riders want is NOISE. Get over it. If these little grunts aren't fast enough buy a bigger grunt.