HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
Adammoto

GYTR 4.83 oz flywheel

32 posts in this topic

Is anyone using this flywheel? I see lots of recommendations from gray and others recommending the heavier 9.21 oz GYTR flywheel, but no comments on the lighter one. I'm looking for a modest increase in flywheel over the stock, not a trials bike.

A friend of mine has Steahly's lighest (7 oz.) flywheel on his YZ250F - and that amount of increase is about right. Not sure how the GYTR flywheels compare to the Steahly though.

Share this post


Link to post
Share on other sites

A friend of mine has Steahly's lighest (7 oz.) flywheel on his YZ250F - and that amount of increase is about right.

That should tell you something right there. Having used DRD 4oz and GYT-R 5.5 ounce flywheels on my '03, I can tell you that they have very little noticeable effect, and I consider them a waste of time.

The YZ450 is a bigger engine than the 250F, and has a smaller flywheel as built. In fact, the flywheel is smaller than your gas cap, if you've never seen one. The 450 crank is heavier, of course, but the engine is way down on rotating mass for its size. The GYT-R off-road (9oz) flywheel on my '06 takes NOTHING away from the engine in terms of snap, and in fact, it will actually pull a little harder than my son's bike with the stock flywheel when run side by side. It does give it the ability to pull harder at a lower speed, run smoother at a lower speed, and stall less often. IMO, the bike should have been built with at least this much weight on it.

Share this post


Link to post
Share on other sites
That should tell you something right there. Having used DRD 4oz and GYT-R 5.5 ounce flywheels on my '03, I can tell you that they have very little noticeable effect, and I consider them a waste of time.

The YZ450 is a bigger engine than the 250F, and has a smaller flywheel as built. In fact, the flywheel is smaller than your gas cap, if you've never seen one. The 450 crank is heavier, of course, but the engine is way down on rotating mass for its size. The GYT-R off-road (9oz) flywheel on my '06 takes NOTHING away from the engine in terms of snap, and in fact, it will actually pull a little harder than my son's bike with the stock flywheel when run side by side. It does give it the ability to pull harder at a lower speed, run smoother at a lower speed, and stall less often. IMO, the bike should have been built with at least this much weight on it.

Gray,

Is this the fly wheel weight you currently have? http://www.yamaha-motor.com/sport/accessories/acscitemdetail/5/348/1218/5375/2007/1/4335/0/detail.aspx

I was thinking about buying and then changing the gearing to some like a 13/46. Would the bottom pull be similar to the 13/49 gearing with the stock fly wheel? I am not sure how much the flywheel makes off the bottom.

Share this post


Link to post
Share on other sites
Gray,

Is this the fly wheel weight you currently have? http://www.yamaha-motor.com/sport/accessories/acscitemdetail/5/348/1218/5375/2007/1/4335/0/detail.aspx

I was thinking about buying and then changing the gearing to some like a 13/46. Would the bottom pull be similar to the 13/49 gearing with the stock fly wheel? I am not sure how much the flywheel makes off the bottom.

That's the part number, but the picture is of the earlier unit for the '03-'05 model. Which year model do you have?

Share this post


Link to post
Share on other sites
That's the part number, but the picture is of the earlier unit for the '03-'05 model. Which year model do you have?

have an 07 yz450

Share this post


Link to post
Share on other sites

The improvement to low end pull is kind of a subtle thing. It shows up one day when you find yourself thinking that the bike bike seems to really be running smooth and pulling hard at low speed, and you don't remember when it had that much grunt. Then you realize it's the flywheel doing it. I don't know it's three teeth worth or not, but it's certainly significant.

Share this post


Link to post
Share on other sites

i have run the off road heavy gytr fly weight since day one. for my 07 and it was the best investment i ever made!

Share this post


Link to post
Share on other sites

In regards to the heavier flyweel, any drawbacks once on a Motocross track? Is it harder to pop the front wheel up? What is the drive like out of turns?

I know its alot of questions but I've always wanted to know. I've been thinking about changing the flywheel for a while. Especially since I an a novice rider.

Share this post


Link to post
Share on other sites
In regards to the heavier flyweel, any drawbacks once on a Motocross track? Is it harder to pop the front wheel up? What is the drive like out of turns?

In order, no, no, and the drive leaving turns is improved because low end power is improved, the bike pulls harder sooner, and traction is improved.

Share this post


Link to post
Share on other sites
In order, no, no, and the drive leaving turns is improved because low end power is improved, the bike pulls harder sooner, and traction is improved.

Would there be significantly more engine braking coming into corners compared to using less flywheel weight?

Share this post


Link to post
Share on other sites
Would there be significantly more engine braking coming into corners compared to using less flywheel weight?

Actually, adding rotating mass works in opposition to engine braking, since the additional inertia tends to keep things in motion. The difference, which probably does exist, is not noticeable, really.

Share this post


Link to post
Share on other sites
Actually, adding rotating mass works in opposition to engine braking , since the additional inertia tends to keep things in motion. The difference, which probably does exist, is not noticeable, really.

Wow!. in light of all this info I can't figure out why we all aren't using more flywheel weight.:smirk: I did try a 9oz. weight on my '04 YZ250 and was pleased. It was noticable when riding sand tracks as well. Particularly in the corners.

Share this post


Link to post
Share on other sites

I am in love with my GYTr offroad FWW. It made the bike so smooth off the bottom great traction and it still pulls hard up top no prob.

Share this post


Link to post
Share on other sites

What other options are there for FWW for yz450s? anything heavier ? or you wouldnt consider anything heavier? other makes of flywheels available?

Share this post


Link to post
Share on other sites

I ride only MX and have the heavier GYTR Off-road flywheel weight on my '08 and the same weight was on my '06. I highly recommend it there is zero drawback and for the price and ease of install it's probably one of the best mods for the bike.

Like Gray' said the bike probaly should have come stock with the flywheel.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0