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farmerjohn42

Flywheel Weights yz250

13 posts in this topic

flywheel weights,

I plan on adding a flywheel weight to my yz250 2006 model with a 51 tooth sprocket. I ride trails, single track, sometimes technical, sometimes flowing trails and somewhere between the two there are lots of rollie type rocks. The bike will probably never be ridden on a groomed track.

The question I have, is what weight is better? A whole flywheel or add-on weight? My reasoning is the closer the weight to the bearing inside, the less stress on the bearing and internals, (with a whole flywheel) Which is better? Is there a difference? All the brands are the same, just adds weight, right? Ease of installation?

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GYTR off road flywheel. $78.71 at the sports plaza. 'Nuff said.:thumbsup:

I got mine to reduce stalling on single track technical trals. It works.

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Not sure how much the GYTR weighs, but I'm running the Steahly 11 oz. and I like it alot. Really lets you lug the bike slow in the trails without worrying about stalling.

Installation is a snap - maybe about 10-15 minutes. You need a flywheel puller that costs about $16 from Motion Pro. And I also used a little plastic gadget that you screw into the spark plug hole that allows the piston to get to top dead center. In order to get the flywheel off, the piston has to be stopped from moving up and down. That was like another $8 or so. Use the flywheel puller to take off the stock FW and then put on your aftermarket FW and tighten everything up. I think you need to loosen/tighten two separate bolts altogether. Very simple procedure. Good luck.

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farmerjohn you raise some good questions, I've been wondering myself wether it makes a difference were the weight is added, closer vs. farther from the rod and closer vs. farther from the crank centerline. And wether or not these weights have an effect on the engine vibration you feel in the handlebars?

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Dont worry about stress to the motor. Our yz's will pull anything you can throw at them. Obviously, something grossly out of balance is a problem, but I have never seen a factory or aftermarket model that was.

Vibration??? If I had to pick an answer, the GYTR weight may have made it slightly smoother. The difference was small enough that I would probably have to be forced to answer this question.

I love the gytr flywheel weight. Its welded on, balanced and dead nuts simple to install as long as you have a flywheel puller. It only fits under the stock ignition cover. Aftermarket covers will work if you use the steahly spacer.

The other option is a SFB (TT store has these) bolt on or a Steahly bolt on..maybe others in countries out fo the uz.

The drawback to the gytr weight is that its only available in size that is about 8oz heavier than stock. Steahly has plus 6, 9 and 13 as I recall.

Steahly rules. Chuck Steahly is Mr Customer service and the guy is unreal. If you cannot makeup your mind for weight, buy a 13oz from him and if its too heavy, he will reduce the weight for a very small charge. I believe he may have started making complete weights, but not sure if he has one for the yz 250.

Being that you went to a 51 tooth rear, I assume you like snap. A 13 will reduce snap. An 8 leaves plenty...anything under 8 is tough to feel one way or another.

So, my recommendation will be between 8 and 13. Before I settle on one, please tell me why you want to add one? What is the performance difference your looking for?

Steahly does have a littel chart that recommends specific weights on their sight. http://www.steahlyoffroad.com/recommendation_charts.htm#YAMAHA

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I love the gytr flywheel weight. Its welded on, balanced and dead nuts simple to install as long as you have a flywheel puller. It only fits under the stock ignition cover unless you add a steahly spacer.

I just put my second one on last night. First one went on my '04 but now I have an '03.

I put it on and got the cover all buttoned up and then found I couldn't kick the machine over.:thumbsup: The cover was rubbing too closely. You need to use the flywheel removal tool to all put this one on and make sure the woodruff key is lined up perfectly. Once you do that it slides deeper onto the crank allowing you to torque the nut down and provide clearance between the replacement flywheel and the ignition cover. So, with an '03/'04 I didn't need a spacer.:ride:

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[The other option is a SFB (TT store has these) bolt on or a Steahly bolt on..maybe others in countries out fo the uz.]

Thanks for the info on the TT store. I struggle sometimes with their search feature and had not found it previously.

[being that you went to a 51 tooth rear, I assume you like snap. A 13 will reduce snap. An 8 leaves plenty...anything under 8 is tough to feel one way or another.

So, my recommendation will be between 8 and 13. Before I settle on one, please tell me why you want to add one? What is the performance difference your looking for?]

I am indeed looking for a little snap to remain. Lucky for me I have a buddy who let me ride his bike with the 51 sprocket and 11 oz wt and I really liked it. It provided enough snap but yet gave it some rideability while in trails or climbing hills.

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Your feedback is much appreciated guys. Thanks!

Now you guys raise another question, with an add on weight or flywheel, will it need a spacer and if so do the weights generally come with a spacer?

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I think all but the 13oz. Steahly clears without a spacer required. The GYTR does. Check Steahly's website to be sure though.

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Your feedback is much appreciated guys. Thanks!

Now you guys raise another question, with an add on weight or flywheel, will it need a spacer and if so do the weights generally come with a spacer?

My Steahly 11 oz. did not require a spacer.

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I love my 11oz steahly. I have a PC pipe and shorty, and some MINOR motor mods with a little more compression. and the bike revs much quicker than a stock motor yet is very tractable and torquey on the bottom. I ride mx only though. I currently have a 14/48 setup.

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ive got an sfb in think a 11oz??? anyway i love it and it took about 5min to install...awesome i would recommend it all day long!!!

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I have a totally stock 06 yz250 that I race MX w/ the occasional woods ride. I have the 13 stealthy and think it works great. This weekend we were doing some woods exploring and I could run the thing so slow I could hardly hear the exhaust note. Install was a snap. If you don't have anything to hold the flywheel just push a little rope into the cylinder and it'll stop it from turning over w/o any damage. The only mod I had to make is that w/ the 13 you have to bend the little arm that the clutch cable attaches to back just a bit. No ill effects though.

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