New Grom report and USFS exhaust recommendations and oil spinner question.
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New Grom report and USFS exhaust recommendations and oil spinner question.

This is a discussion on New Grom report and USFS exhaust recommendations and oil spinner question. within the Grom Talk forums, part of the Honda Grom Forums category; 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 ...

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Thread: New Grom report and USFS exhaust recommendations and oil spinner question.

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    New Grom report and USFS exhaust recommendations and oil spinner question.

    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.
    50-50 likes this.

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    FluxCapacitor's Avatar
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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

    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 :-)
    absidia likes this.
    2018 Matte Gray Metallic
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    JT 35t Rear Sprocket
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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.
    absidia likes this.

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    Quote Originally Posted by 50-50 View Post
    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.
    50-50 likes this.
    ---
    2018 Grom
    2017 RAM 6.7 diesel, 1978 German Ford Capri, Jeep Wrangler and others. Oh, and horses. Like the living kind.

    Former two stroke moped nut.
    ---

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    Quote Originally Posted by absidia View Post
    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-g...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.
    absidia likes this.

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    Quote Originally Posted by David View Post
    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.
    50-50 and absidia like this.

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    Quote Originally Posted by 50-50 View Post
    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.
    absidia likes this.
    2018 GROM: Modified for reliability longevity gas mileage... and fun.

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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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    Quote Originally Posted by LordSquirrel View Post
    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.

    New Grom report and USFS exhaust recommendations and oil spinner question.-img_1166.jpg
    Last edited by tooter; 06-22-2019 at 06:23 AM.
    2018 GROM: Modified for reliability longevity gas mileage... and fun.

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