Steahly Heavy Flywheel Weight

Choose a machine

User Tip: If you're unsure of your vehicle type, you may skip the machine type selection box.

Use one of my Saved Machines
Steahly Heavy Flywheel Weight
  • View Larger

    Steahly Heavy Flywheel Weight

    Our Price: $114.80$149.95

    View Product Details

    Select type, year, make and model above

    Live Help
    • "Customer service is priority #1 at Rocky Mountain ATV/MC. We value our customers and strive to be the best shopping experience- when you buy from us, you are buying lifetime service."

      -Dan Thomas, CEO and Founder

    • Returns

      We take pride in offering no hassle returns. In the event of a return, please call, email or chat with us to receive a solution to the problem. For apparel that doesn't fit quite right, Click here to see our Fit Guaranteed Program.

    • Warranties

      We will stand behind all products we sell with regards to manufacturing defects in workmanship and material. Most products are limited to the manufacturer's warranty. However, we will do everything in our power to take care of the problem.

    • Have questions?

      Live Help (Leave email if after hours)
      Email: [email protected]
      Call us: 1 800 336-5437
      7am-7pm Mon-Fri 8am-4pm Sat (Mountain Time)

    Details

      When you’re looking for the benefits of a heavier flywheel but don’t want to replace the flywheel itself, pick up the Steahly Heavy Flywheel Weight for more momentum and faster riding right out of the gate.

      A heavier flywheel can make a big difference to the characteristics of your dirt bike’s engine. With heavier inertial mass your engine will have more spinning momentum. When you’re on the throttle this translates to the power building up and coming on more smoothly, giving you increased traction and less stalling at low rpms. These characteristics are perfect for new riders just learning throttle control and seasoned enduro riders that need the extra momentum and engine lugging ability when they run into slow, technical terrain.

      If you find yourself disliking the need to wind up your engine, install a Stealhy Heavy Flywheel Weight to put your bike’s power exactly where you want it.

      Specs:
    • Securely and easily attaches to existing flywheel
    • Comes with hardware
    • Makes for smoother delivery of power
    • Increases traction on difficult terrain
    • Reduces likelihood of stalling at low speeds and rpm
    WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    Steahly Heavy Flywheel Weight Reviews

    Each review submitted enters you into a
    $100 gift card monthly drawing and a
    $500 gift card quarterly drawing!
     
    4.7 / 5.0
    194 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Star
    154
    32
    4
    3
    1
    Value
    4.5 / 5
    Durability
    4.8 / 5
    Fitment
    4.8 / 5
    Performance
    4.8 / 5
    Recommend it?
    Yes (99)
    No (2)
    Value
    4 / 5
    Durability
    5 / 5
    Fitment
    5 / 5
    Performance
    5 / 5
    Recommend it?
    Yes
    Trail necessity on a motocross bike
    Fit well, easy to install, much less stalling on technical trails
    August 1, 2019
    Rigby, ID, US
    Age: 25-44
    Purchased
    1 month ago
    Gender:
    Male
    Weight:
    161 - 190 lbs.
    Height:
    5'10 - 6'0
    Value
    4 / 5
    Durability
    5 / 5
    Fitment
    5 / 5
    Performance
    5 / 5
    Recommend it?
    Yes
    Great improvement
    Really smoothed out the engine on my sons kx100. It doesn’t stall anywhere near as much
    July 24, 2019
    Grand Rapids, MI, US
    Purchased
    1 month ago
    Recommend it?
    Yes
    Works great on my 01 cr250. Lots of low end power.
    May 28, 2019
    Wadsworth , OH, US
    Purchased
    4 months ago
    Value
    5 / 5
    Durability
    5 / 5
    Fitment
    5 / 5
    Performance
    5 / 5
    Recommend it?
    Yes
    bike had no lowend now she comes alive like a new one
    just installed the 10oz weight on my cr 125 when it was restored had no low end i done everything to get more out of it but couldnt so i thought why not lets try this should have in the first place but didnt an now u can take off in third gear like its nothing for it to do an it took me 10 mins to put on really good investment for me thanks again rocky for haveing what i need

    -m-1996 HONDA CR125R--
    easy to put on big change of power
    easy to put on big change of power
    May 15, 2019
    ethridge , Tennessee, UM
    Age: 25-44
    Purchased
    3 months ago
    Gender:
    Male
    Weight:
    131 - 160 lbs.
    Height:
    5'4 - 5'6
    Value
    5 / 5
    Durability
    5 / 5
    Fitment
    5 / 5
    Performance
    5 / 5
    Recommend it?
    Yes
    good item
    good item is durable and is perfect for my bike

    -m-2015 YAMAHA YZ250--
    May 14, 2019
    trois-rivieres, QC, CA
    Age: 25-44
    Purchased
    over 2 years ago
    Gender:
    Male
    Weight:
    161 - 190 lbs.
    Height:
    5'10 - 6'0
    Value
    3 / 5
    Durability
    5 / 5
    Fitment
    4 / 5
    Performance
    4 / 5
    Recommend it?
    Yes
    10 oz Steahly on KX85
    Not especially cheap for what it is, but does exactly what we wanted. One issue - came with wrong nut for kx85 crank threading, but a call to Steahly fixed that quickly - they mailed me the proper nut.

    Designed to add mass and smooth the impulse of a 2 stroke, it does just that. My boy (age 12, 75 lbs) says it pulls better out of corners and feels smoother when on the gas. He's noticeably faster with it since he can get on throttle sooner, and harder, than before, without fear of losing traction.

    -m-2018 KAWASAKI KX85--
    March 28, 2019
    Forest Grove, OR, US
    Age: 15-24
    Purchased
    5 months ago
    Gender:
    Male
    Weight:
    <100 lbs.
    Height:
    <5'0
    Value
    4 / 5
    Durability
    5 / 5
    Fitment
    5 / 5
    Performance
    5 / 5
    Recommend it?
    Yes
    Perfect
    it rolls on the power and is perfect for trail riding

    -m-2003 YAMAHA YZ125--
    March 27, 2019
    musselshell, MT, US
    Age: 15-24
    Purchased
    11 months ago
    Gender:
    Male
    Weight:
    131 - 160 lbs.
    Height:
    5'7 - 5'9
    Value
    5 / 5
    Durability
    5 / 5
    Fitment
    5 / 5
    Performance
    5 / 5
    Recommend it?
    Yes
    So far so good
    Went from stock to +13 flyweight on my 2015 YZ 250. Haven't raced a scramble since installing so I haven't had a chance to truly lug through anywhere, but I wasn't able to tell a difference when riding for a few hrs on my property. It's mainly open trails, but I thought I'd be able to tell immediately, but couldn't. Easy install. Took about 30 minutes start to finish. Looking forward to trying it in the next race.
    March 25, 2019
    Perry, GA, US
    Age: 25-44
    Purchased
    6 months ago
    Weight:
    221 - 250 lbs.
    Value
    5 / 5
    Durability
    5 / 5
    Fitment
    5 / 5
    Performance
    5 / 5
    Recommend it?
    Yes
    Great product so far
    Easy to install and works very well.

    -m-1996 HONDA CR125R--
    March 20, 2019
    Doylestown , PA, US
    Age: 25-44
    Purchased
    5 months ago
    Gender:
    Male
    Weight:
    221 - 250 lbs.
    Height:
    5'10 - 6'0
    Value
    4 / 5
    Durability
    3 / 5
    Fitment
    3 / 5
    Performance
    4 / 5
    Recommend it?
    Yes
    Easy to install, more torque!
    At first I received the wrong tool to install it (see picture). But Rocky mountain sent a replacement and after that, it was all good.
    I used a flywheel holder to remove the original screw, and a tool to block the piston for the install.
    Love the way my bike handles now. The 250 SX was a bit too much for me, now I can use the torque better.
    Remember to check the install after 30min as it tends to come loose.

    -m-2017 KTM 250 SX--
    Wrong tool
    Installed
    March 14, 2019
    Little Rock, AR, US
    Age: 25-44
    Purchased
    6 months ago
    Gender:
    Male
    Weight:
    191 - 220 lbs.
    Height:
    5'10 - 6'0
    Each question or answer submitted enters you into a:
    $100 gift card monthly drawing and a
    $500 gift card quarterly drawing!
    Start typing your question and we'll check if it was already asked and answered. Learn More
    Browse 35 questions Browse 35 questions and 128 answers
    Is this a bolt on kit or does it need glue for a 2013 KTM 250sx?
    Christopher B on Mar 5, 2018
    BEST ANSWER: I have a 350sxf and it was a glue on part. I would very highly recommend this weight if you ride trails, I was Skeptical and this definitely did the trick for me in the slow technical, helps with stalling, grip, tongue, confidence, etc! Love it!
    Hello Everyone, I have a 2012 CRF 150r and want to convert it to trail riding. I have been looking into adding a heavier flywheel. I was wondering if Boyesen Quickshot 3 accelerator pump would be a better option to help reducing stalling at low RPM's, bogging and help the bike warm-up faster? Someone suggested a 9 oz steahly flywheel and a 14t sprocket. I am looking for the easier option, as I have only a little mechanical experience. Any suggestions?? Thank you.
    LISA B on Oct 3, 2016
    Steahly Heavy Flywheel Weight
    Steahly Heavy Flywheel Weight
    Boyesen Quickshot 3 Accelerator Pump Cover
    Boyesen Quickshot 3 Accelerator Pump Cover
    BEST ANSWER: Just try a smaller front sprocket first, a 1 tooth smaller sprocket in the front makes a huge difference.
    Then if need be.. Get an R&D adjustable pilot screw, that will help with altitude changes which causes the obvious hard starting/stalling. Write down, or put the adjustment "turns out/in" on a piece of tape and put it on the frame somewhere, or in your phone. Otherwise you're going to probably forget the exact number.
    I don't think that the quickshot is going to do the trick. Try the Flywheel last, but I honestly don't think you will need to do that install either.
    Good luck...
    I already have a rekluse clutch so I do not need it for stalling. what i need is to make the bike less snappy. the power comes on too quickly and i want to smooth it out. I have a 2015 KTM 350SXF. does this work well with a Rekluse?
    A shopper on May 22, 2018
    Steahly Heavy Flywheel Weight
    Steahly Heavy Flywheel Weight
    Steahly Heavy Flywheel
    Steahly Heavy Flywheel
    BEST ANSWER: I put a Steahly flywheel on an 08' Honda CRF250r and it did tame down the throttle response and engine braking. It was a great looking piece and fit well. I put a fly wheel weight on my FX40 Husky and had problems. the weight hit the timing cover and filled the motor with metal when I ran it. I ended up having to take the flywheel with the weight installed to a machine shop and have them shave .060" of the weight, to asure clearance. after install and clean up I have not really noticed any difference in the performance what so ever. I wish I had not even bought it. to tame the 450's touchy throttle response and engine braking, I ended up increasing the idle speed to get above that touchy throttle opening.
    Has anyone put the +5oz weight on a 2010-2017 Honda CRF250R? If so, has it made a difference for trails?

    Does the kit come with everything needed for install or do you need a flywheel puller / piston stop etc?

    Thanks!
    Stuart K on Feb 19, 2018
    BEST ANSWER: You shouldn't need to remove the flywheel, but a piston stop may come in handy. It will make it harder to stall, easier to trail ride. It will have instructions and if you're still unsure, Steahly has a website, you can contact them directly. I have used several of these and I have been pleased with how they install and how they work.
    2017 KTM 350 xcf:
    Does this kit include everything needed to install? Will this fit on the stock ignition cover?
    joshua c on Dec 21, 2018
    BEST ANSWER: I got one for my 2010 ktm 300xc worked great needed a fly wheel puller and used stock ignition cover easy to install but tooke time to clean and glue bake but it was winter and I wasn't riding so it was no big deal. I also got one for my cr250 took about 15 min to install stock ignition cover also really noticed a big difference in bike performance on that.
    does it come with the Special Tool needed to install it?
    A shopper on Jan 26, 2019
    BEST ANSWER: It does come with the adapter and bolts to install as well as the small allen wrench to tighten set screws. You will need some red lock tight for the set screws.
    Is this a bolt on kit for my 2016 kx100? And do I need an extra gasket to accomidate the spacer?
    PAUL P on Jan 5, 2017
    BEST ANSWER: Just make sure it says it's compatible with your bike when choosing. I installed mine on a 2001 CR250 and it was bolt on. You use their mounting tool along with your wrench. Then tighten the small 4 balancing allen bolts initially and routinely. It should not require a spacer to my knowledge.
    Does this item come with the cover spacer?
    Erik V on Jul 9, 2019
    BEST ANSWER: The cover spacer is not needed for a YZ125 so it is not included. Easy install but I recommend getting the Tusk engine lock up tool to make it easier.
    Does this come with cover spacer and additional gasket/s?
    ryan b on Oct 11, 2018
    BEST ANSWER: It does include the cover spacer. I reused the gasket on my yz450f. It also includes the tools needed for intstall. You will need red lock tite for the set screws.
    Is this flywheel weight balanced properly? Has anyone noticed any additional vibration?
    Doug F on Aug 2, 2019
    BEST ANSWER: Haven’t noticed worse vibrations (suspension and setup) I really don’t notice my Bikes vibrations very often, I do notice other bikes vibes though. Definitely helps the bottom end and helps prevent stalls. I would highly recommend going 13/52 for gearing. Gear 1st for walking pace if you’re riding hardenduro kinds of terrain!
    Braaap
    So my question about this product is that I am not sure if it's really something I need or not. Ride a '09 200 XC and most of my riding is faster type riding. I do hare scrambles some and mostly do that type of riding for recreation but occasionally I get out and do some tight, steep tech riding and experience choke out on certain types of obstacles. I know that skill is the main factor but I thought something like this might help but at the same time I don't want to loose any of the top end hit or acceleration. Should I go this route?
    A shopper on Feb 10, 2019
    BEST ANSWER: You won't lose any top end with it. I liked mine that I had on my 250 and I had the 11 oz. Wish I would of had the 13 but the 11 worked great. Where you will really love it the most is when you start getting tired towards the end of a race or a real long day of trails. That's when you will notice it the most.

    They aren't that hard to put on or remove so if you are riding where it is open and fast you can easily take it off and then throw it on when you decide to go ride the tight technical trails. Hope this helps
    Does the Steahly 13oz kit for the 2000 YZ250 have the installation tool included? I plan to order the engine stop separately, but I'm wondering if it has the rectangular bracket that you use to torque down the flywheel weight on the shaft.
    Chris D on May 2, 2017
    BEST ANSWER: I'm not positive on the yz kit but I bought a flywheel kit for my KTM 200 xcw and it had everything I needed to install it including at bracket to torque down the flywheel. I also chose to buy a spark plug style engine stop separately. It was a breeze to install. Good luck!
    For a 2016 KTM 450 XCF, does this product bolt on, or glue on?
    Casey W on Jan 2, 2019
    BEST ANSWER: I installed this product on a 2005 yz 250. I am sure there is no glue on flywheel weight due to the extreme centrifugal forces in play.
    Hello,

    Isn't a 10 oz flywheel (as suggested by the website) a bit much for a KX85? Do I need to change the side cover? Thanks for the answers...
    Antonello C on Dec 27, 2018
    BEST ANSWER: I run a 10oz on my son’s KX65 and it works great for it. We race harescrambles here in the Southeast and it allows it to hookup better in snotty terrain by taking out some of the “hit” of the power band... also a
    new side cover isn’t needed it will come with a spacer.
    Where can i get a replacement nut for this?
    Jacob L on Jul 1, 2019
    BEST ANSWER: Every conversation I’d had directly with Steahly has been helpful. I would contact Steahly.
    I have an 03 yz450f that I am rebuilding and have not ridden yet biggest bike I have ever rode but all I ride are trails and herd good things about the weights on trails and especially to tone down the 450's, true or false?
    A shopper on Apr 25, 2019
    BEST ANSWER: The flywheel weight will smooth out the hit of a 450 and will make it easier to ride on the trails. Last one I installed was on a KX500 which made it much more tractable. If the YZ is prone to stalling, the weight will help with that as well.
    does the 5 oz weight make much difference on a crf250r?
    Kyler H on Mar 3, 2019
    BEST ANSWER: I put an 8 oz on my 2017 KTM sx150. It helped to keep the engine from stalling the engine under hard braking and smooth out power band. A 5 oz would do the same for you only with less effect on the braking or the power band. It has almost no effect on how fast you accelerate at all. And may even give better acceleration because you’d have less wheel spin and more traction
    how do you decide what weight to use? 10 oz, 12oz, 14oz? this is for a 1999 CR250 ridden in the tight woods only.
    Jeffrey E on Sep 30, 2018
    BEST ANSWER: My experience was with a KX500 two stroke. I also was interested in making the bike more for woods riding. Basically my feelings using the 14oz flywheel on my bike was that the throttle response became a bit more sluggish less likely to experience whiskey throttle. Possibly some torque effect but not like I had hoped/expected. A 14oz flywheel might make a better/positive difference on a 250cc. Hope that helps in some way. R
    What type of difference on a 2004 Suzuki RM250 (with the 10oz and does the stock Magneto cover work)?
    Scott G on Jul 31, 2018
    BEST ANSWER: It will now lug down to almost a stop, and then pull out of it with a blip of the throttle. It doesn't lose horsepower or the noise, it just doesn't have the abrupt hit anymore. I definitely recommend this product. Also, the stock cover works. This comes with a spacer, gasket, and replacement nut for the flywheel. It didn't affect my shifter.
    Is anyone running the 7 oz on a 2015 KX450F or similar year KX450F? How well does it work in tight woods? Any stalling even with running it?
    Justin T on Oct 26, 2017
    BEST ANSWER: I run a 6 ounce weight on my ktm 450 sx and my 2 other ktms I also run Steahly weights . It won't eliminate stalling altogether , but it helps and it seems to have more pulling power. I don't ride in tight woods at all, but it's a relativity inexpensive modification .It's alot cheaper than a rekluse cluthch. Don't forget a Kx450 F is big bike for tight woods riding. Just make sure the crank bearing are in good shape , there is extra weight on those bearing. Hope this helps!
    Do you have the flywheel weight for Husqvarna TC250 2017/2018 in 9oz.?
    A shopper on Oct 25, 2017
    BEST ANSWER: Unfortunately we only offer the +11oz.
    Will this fit with a Boyeson ignition cover on YZ250X 2016???
    Terry M on Dec 20, 2016
    BEST ANSWER: I'm sorry but I don't have any idea of yes or no. I bought mine for a 1990 kdx 200. I can say it went on it with no problems though. It took away some of my quickness in revving, smoothed the power band hit and allowed me to lug gears pretty well. The only downside I feel it has is that if you lug to low its much harder to get rpms back almost unable to fan the clutch. I ultimately took mine off but I did have better tractability but I trail ride and lots of hills it is a good product it just doesn't fit my personal liking. I tried it couple times and not just quick ride I tried to get used to it for several hours each time.
    Looking for a flywheel weight for my 2014 Husaberg FE 350. Don't have a problem with stalling, would just like to tame snappy throttle response and engine braking. Any suggestions?
    Gus S on Apr 7, 2019
    BEST ANSWER: I have only used these on 2 stk's but they have been very good at smoothing out the "hit". Go with the 13 oz. You won't be disappointed.
    Does the Ignition cover on a 2004 cr 250 have to be modified to fit?
    mark L on Dec 31, 2018
    BEST ANSWER: From the Steahly website:Honda CR 250 03-07 Flywheel Weight For reduced stalling and a smoother, more controlled and tractable power delivery use a Steahly flywheel weight. Most riders will ride better and longer with our flywheels, just like Ryan Hughes did with his win at the inaugural Las Vegas Enduro Cross. The 2003 to 2007 CR flywheel weights that add 6, 8, and 10 ounces are very easy to install. The installation of the 12 ounce is a little more involved because you must grind down a small flange on the inside of the ignition cover. The 6, 8, and 10 ounce need no modifications. A Dyno test by Dirtrider Downunder Magazine on a 07 CR 250 showed an increase of 1.13 horse power at top end and an increase of 3.67 HP / 2.09 ft-lbs of torque at low-mid range. We recommend adding 10 ounces for most intermediate trail riders and less aggressive MX riders. 8 ounces for aggressive trail riders and intermediate MX riders. 12 ounces for casual trail riders or very technical terrain.
    I'm planning on purchasing a 14oz weight for my 2000 cr250. Will I need to purchase another gasket for the spacer?
    Travis H on Dec 10, 2018
    BEST ANSWER: I had a 2001 Cr250. Some years need a spacer, which is supplied. The 2001 didn’t need a spacer. Need check and see if you will need one for your year.
    Did anyone have trouble installing the 14oz on a 2001 cr250? wondering if I'm missing something because I can't put my case cover back on with the flywheel weight on.
    Tristan J on May 13, 2018
    BEST ANSWER: I had the same problem on my 2001 Yz 250, as I recall there was a spacer that I had to put on to make it fit .
    Will the flywheel weight from a 2010 crf 250r fit my 2005 crf 250r?
    A shopper on Apr 4, 2017
    BEST ANSWER: You can cross reference part numbers for the 2 bikes.
    I bought this product for my 2013 yz250 and have not installed it yet. it did not come with a spacer so my question is should it have come with a spacer or is it not required for my bike?
    Matthew M on Nov 8, 2016
    BEST ANSWER: This flywheel weight works without a spacer and your stock ignition cover. But if you have an after market metal cover, you'll need to order their Y-826 spacer from their site.
    I have a 2014 KTM EXC 500, are there fly wheel weights for them ?
    Tom L on Jan 23, 2019
    BEST ANSWER: Unfortunately, we do not carry fly wheel weights for this machine.
    does the kit for the 2015 350 XCF needs the flywheel pulled ?
    denis F on Jun 28, 2018
    BEST ANSWER: Nope just the nut holding fly wheel
    RM Cash ProgramParts Finder