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Hi, folks. Searching this site has provided a wealth of information, it is great to see a community exist for these little bikes.

First day I purchased my 2018 Grom I promptly rode it 100 miles to get a feel for it. These are my first impressions:

1. Pretty darn good power for the engine size. I am not light at 200lbs, but still was able to maintain 50-55 no problem and 61 on flat farmland WOT. First tank at 100 miles was 1.13 gallon. Not bad.
2. My butt hurt. I ride horses and like to think I have a fairly tough backside as a result. I promptly ordered a custom Corbin seat, which I have used on other motorcycles and been very happy with. Review incoming once I get back from a work trip.
3. Occasionally I bottom out the rear shock, I ride on rough rural roads and dirt roads. I have the Maxxis knobbies on it, which actually work better on dry road then I expected.
4. Headlight is unremarkable, totally fine for urban driving but out in pitch black farmland / desert its not going to cut it. I'll upgrade this after a few mechanical upgrades and much research.
5. Easy to load in and out of my pickup, awesome!
6. I'd like to get a metal dipstick at some point, black plastic is hard to check in lowlight.

So, yeah I am a pretty happy camper. My goal is reliability at WOT and performance second.

My first upgrade will be new exhaust. I need something stamped with the USFS approval as a spark arrester is required where I ride. (FS, BLM, desert, etc) Is there one with it built in? So far I have been considering an M4 as you can slip in a generic round spark arrestor. I prefer quiet for my use case, which is mostly exploring, travel and not attracting undue attention.

I'll start a build thread once I have everything in hand and probably throw some youtube videos up about it.

First upgrades:

1. Seat
2. Exhaust
3. Kitaco cover/oil filter and big oil cooler. (Does removing the oil spinner cause issues like you'd see with a lightweight flywheel?)
4. Rear fender delete, add cargo rack, remove passenger provisions.
5. Temp sensor(s)
6. ECM coder (thinking dynojet vision 3, I love data)
7. Intake (I will probably butcher the stock airbox prior)
8. Extra fuel storage. (I have some unique ideas on this)
9. Rear shock, maybe something for the front as well. (This one might get pushed ahead if I keep bottoming out)
10. Headlight (probably sooner, just don't know what to do about it yet)

So any advice is welcome and I'll keep you updated.
 
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Welcome and ride it like you stole it!

I'm a new Grom owner too with 1300 miles in the 1st month :blackgrom:

Everyone has their own needs/preferences, looking at your list and post I'd spend your money on a seat and the headlight but the first thing I would do is get that rear fender off :)
 

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Congrats! Welcome to the site.

The fender eliminator was also my first mod. But if you ride on dirt you may want to keep it. Water and mud spray my back after removing the stock rear fender.

I have no idea how you got to 60. I'm about 155 pounds and never saw 60 MPH with the stock exhaust.
Thanks for the welcome! Maybe the tires are a little bigger and it is a false reading. I'll find out! Good tip on the fenders, I'll leave them there. I'd don't mind getting wet but muddy is another thing. Just need to find a cargo rack that is compatible. :) This from did live with someone else for its 28 miles, so there is a chance there might be something else done to it, but I have not found anything yet.
 
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First upgrades:

1. Seat
2. Exhaust
3. Kitaco cover/oil filter and big oil cooler. (Does removing the oil spinner cause issues like you'd see with a lightweight flywheel?)
4. Rear fender delete, add cargo rack, remove passenger provisions.
5. Temp sensor(s)
6. ECM coder (thinking dynojet vision 3, I love data)
7. Intake (I will probably butcher the stock airbox prior)
8. Extra fuel storage. (I have some unique ideas on this)
9. Rear shock, maybe something for the front as well. (This one might get pushed ahead if I keep bottoming out)
10. Headlight (probably sooner, just don't know what to do about it yet)

So any advice is welcome and I'll keep you updated.
I'd also go with the seat as first mod, good choice!
Exhaust, choose carefully, lot of the exhausts available are LOUD. Fun for 15 minutes, tiring after that, especially on longer rides.
Kitaco cover / oil cooler, no technical issues if you follow the instructions. Get a temp meter first, a stock, stockish Grom engine really doesn't need a cooler. Also you'll loose a lot of inertia with the Kitaco cover, nice when in a hurry, not so nice if you do a lot of stop and go or evolve at very low speeds near idle. You can also turn down the stock spinner if you don't go Kitaco but still want to loose some mass.
Rear fender, I agree with what was said above.
The Dynojet power vision seems nice, I just don't see why you'd need it. You could get a reflash for a fraction of the price.
Intake, like the exhaust has a tendency to add a lot of noise.

Other cheap mods I like a lot, stiffer clutch springs, the clutch feel is so much better! Go 60% Kitaco, those are cheap and do the same as other 60% springs. No need to upgrade the other clutch parts. Last mod is the gearshift linkage https://www.hondagrom.net/forums/7-grom-talk/7345-gear-pedal-linkage-what-load.html
You can find complete sets on eBay, a bit more expensive than the hardware store but if like me you're in the middle of nowhere it will save you a lot of miles and time.
This really improved the gearshift on my Gloms.
 

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Also you'll loose a lot of inertia with the Kitaco cover, nice when in a hurry, not so nice if you do a lot of stop and go or evolve at very low speeds near idle. You can also turn down the stock spinner if you don't go Kitaco but still want to loose some mass.
This is why I'm so torn about the Kitaco cover. Flywheel weight is not always bad to have.

It seems the Takegawa cover also deletes the spinner/flywheel mass, but almost nobody talks about that cover for some reason.
 

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It's much more expensive and the Kitaco one coming out before it gathered most of the attention.
I do like the Takegawa cover as you can add a thermostat on the oil line exit, nice feature but adds to the cost.
 

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This is why I'm so torn about the Kitaco cover. Flywheel weight is not always bad to have.

It seems the Takegawa cover also deletes the spinner/flywheel mass, but almost nobody talks about that cover for some reason.
Oh oh… I just got a Kitaco cover.

Are there any guys here who can describe how their engines run without the flywheel spinner? Are you having any problems? Thanks. :)
 

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I just put on the Kitaco cover about a month ago. Put about 1k miles on it and have had no problems except this weird whining noise. It seriously sounds like a turbo spool. I did a quick google search and found others that have reported the noise with no other problems. I'm not too worried about it, but I'm listening if it gets worse. Maybe a small small small increase in power without that weight. I also installed the takegawa oil pump with the modded pickup tube at the same time. Overall, the bike runs cooler at prolonged WOT and long red lights.
 

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I just put on the Kitaco cover about a month ago. Put about 1k miles on it and have had no problems except this weird whining noise. It seriously sounds like a turbo spool. I did a quick google search and found others that have reported the noise with no other problems. I'm not too worried about it, but I'm listening if it gets worse. Maybe a small small small increase in power without that weight. I also installed the takegawa oil pump with the modded pickup tube at the same time. Overall, the bike runs cooler at prolonged WOT and long red lights.
Just a guess... flat cut gears whine more then there isn't a load on them, so possibly removing the load of the flywheel spinner on them could be causing them to whine. And same here, I also got a Takegawa oil pump to install while everything is apart. Everything gets installed at the next oil change.

IMG_1166.JPG
 

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I just put on the Kitaco cover about a month ago. Put about 1k miles on it and have had no problems except this weird whining noise. It seriously sounds like a turbo spool. I did a quick google search and found others that have reported the noise with no other problems. I'm not too worried about it, but I'm listening if it gets worse. Maybe a small small small increase in power without that weight. I also installed the takegawa oil pump with the modded pickup tube at the same time. Overall, the bike runs cooler at prolonged WOT and long red lights.
That's concerning. Removing the 2 pound spinner from one side of the engine and no weight from the other side may lead to an imbalance. Another concern I've had in the back of my mind.
 

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Just a guess... flat cut gears whine more then there isn't a load on them, so possibly removing the load of the flywheel spinner on them could be causing them to whine. And same here, I also got a Takagawa oil pump to install while everything is apart. Everything gets installed at the next oil change.

View attachment 80906
Keep us posted on if you notice a difference after install. I've been on the fence about doing the spinner delete because I'm concerned with losing torque. From reading a lot of your post I think you are more concerned with torque as well.
 

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Keep us posted on if you notice a difference after install. I've been on the fence about doing the spinner delete because I'm concerned with losing torque. From reading a lot of your post I think you are more concerned with torque as well.
I'll find out. :)

You don't actually lose any torque as nothing within engine itself is changed. It still produces exactly the same amount of torque. The flywheel only has inertia which resists changes in engine rpm over time by storing and releasing rotational energy. Think slow flowing molasses. Without a flywheel, the engine rpm speeds up and slows down faster, however the amount of torque produced remains exactly the same..

This will be an interesting experiment as I use my Grom for daily transportation and keep gas mileage records. I'll report on the results.
 

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That's concerning. Removing the 2 pound spinner from one side of the engine and no weight from the other side may lead to an imbalance. Another concern I've had in the back of my mind.

Meh. I just choose to believe I forgot I installed a turbo :big smile:
 
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been running the Kitaco clutch side over which removes the oil spinner which to me improved proformance on both of my groms from the old 170-183cc -2v to the 181-4v BBK kit engine. I did not remove the OEM flywheel or do a lighten flywheel. I tried using a lighten flywheel for test on my 2V BBK kit engine and noticed that my voltage output was just a dab lower than with a stock flywheel.

From my friend who has a one off 241cc grom when he had the lighten flywheel on his engine he noticed a lot more vibrations.

So all in all I think just installing a Kitaco clutch side cover which removes the oils spinner is a win win update, plus you have a real oil filter.
 

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I have a turned down spinner, i removed like 2 lbs off of it or something like that, quite a bit, Definitely notice snappier revs BUT, definitely easier to stall at very slow lugging speeds. Been tempted to go back to a full weight spinner, but it doesnt cause nearly enough issue for me to tear into it again to swap it back. Plus engine runs smoother with the lightened spinner.
 

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I have a turned down spinner, i removed like 2 lbs off of it or something like that, quite a bit, Definitely notice snappier revs BUT, definitely easier to stall at very slow lugging speeds. Been tempted to go back to a full weight spinner, but it doesnt cause nearly enough issue for me to tear into it again to swap it back. Plus engine runs smoother with the lightened spinner.
It runs smoother in what way?
 

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I have a turned down spinner, i removed like 2 lbs off of it or something like that, quite a bit, Definitely notice snappier revs BUT, definitely easier to stall at very slow lugging speeds. Been tempted to go back to a full weight spinner, but it doesnt cause nearly enough issue for me to tear into it again to swap it back. Plus engine runs smoother with the lightened spinner.
That may be an issue with me as I run at low rpms a lot when in stop and go traffic. I'll just try it out and see what happens. If I don't like it I can always put the spinner back on. I really like the idea of having a real oil filter cleaning the oil to make the engine last longer, so we'll see if the positives outweigh the negatives.

This'll be a fun experiment. :)
 

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I really like the idea of having a real oil filter cleaning the oil to make the engine last longer
The paper filter is more convenient but the centrifugal oil filter IS a real filter. I don't believe the paper filter will make your engine last longer in any way.
Do some research on centrifugal oil filtering, you'll to be amazed how well it works! :tennis:

I turned down the spinner to about 550g, or roughly half the stock weight, I find it to be a happy medium for me, on my bike, for the kind of ridding I do. It's really a personal preference. Plus it was free.

Either way, the Kitaco cover is a great part, not too expensive, works very well with no technical downsides. All the technical failures I've seen were because of bad installs.
If you want to loose as much rotational weight as possible go for it.
 

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The paper filter is more convenient but the centrifugal oil filter IS a real filter. I don't believe the paper filter will make your engine last longer in any way.
Do some research on centrifugal oil filtering, you'll to be amazed how well it works! :tennis:

I turned down the spinner to about 550g, or roughly half the stock weight, I find it to be a happy medium for me, on my bike, for the kind of ridding I do. It's really a personal preference. Plus it was free.

Either way, the Kitaco cover is a great part, not too expensive, works very well with no technical downsides. All the technical failures I've seen were because of bad installs.
If you want to loose as much rotational weight as possible go for it.
Just cleaning the spinner once will prove to a person that it works very well! I was astonished by the amount of gunk mine caught.

I just wish you didn't have to remove the side cover to clean the spinner and screen. It's a pain, especially since Honda didn't make it the easiest to get on and off. You have to twist it to just the right angle to get it off and on.
 
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