Stock Flywheel Weight YZ 450 06


17 replies to this topic
  • MWO

Posted April 30, 2007 - 05:14 PM

#1

Does anyone know what the stock flywheel weight is on 06 YZ 450 is? I ordered a 9oz GYT -2S297-50-50 I know it adds 9oz to the stock flywheel, my question is what is the weight of a stock flywheel? My new flywheels weighs out at 22.9oz is that the correct weight for GYT-2S297-50-50 or should it be somewhere around 27oz?

  • CaptainKnobby

Posted April 30, 2007 - 05:22 PM

#2

I dont think that is! I dont have much knowledge on flywheels other than adding more weight will tame the snapiness down. Ive only seen fw weights in 6 and 9 oz's

  • KJ790

Posted April 30, 2007 - 05:37 PM

#3

You bought an entire flywheel. It shouldn't weigh 9 oz, it is 9 oz. heavier than the stock one you take off.

  • grayracer513

Posted April 30, 2007 - 08:43 PM

#4

I'm going to boldly suggest that you remove your stock flywheel (using only the correct puller) and weigh it. If the info on Yamaha's site is correct, your stock flywheel should weigh about 13 ounces.

Why, when you have a flywheel in your hand that has a specified amount of weight added, would you think it should weigh 5 ounces more?

  • klb130

Posted April 30, 2007 - 08:50 PM

#5

Why? Just bolt it on and friggin ride!!

  • CROGGR

Posted May 01, 2007 - 12:26 AM

#6

Does anyone know what the stock flywheel weight is on 06 YZ 450 is? I ordered a 9oz GYT -2S297-50-50 I know it adds 9oz to the stock flywheel, my question is what is the weight of a stock flywheel? My new flywheels weighs out at 22.9oz is that the correct weight for GYT-2S297-50-50 or should it be somewhere around 27oz?


The stock flywheel weighs 18oz....the 9oz (27oz total) is the way to go on this bike. I would actually like to have more but this is the limit with the stock case! You will find that it won't stall near as easy, the suspension will actually work better, and you will be able to pull a taller gear through corners or anywhere at low speeds! And contrary to popular belief.......it didn't tame the power much if any!:applause:

  • CaptainKnobby

Posted May 01, 2007 - 04:52 PM

#7

The stock flywheel weighs 18oz....the 9oz (27oz total) is the way to go on this bike. I would actually like to have more but this is the limit with the stock case! You will find that it won't stall near as easy, the suspension will actually work better, and you will be able to pull a taller gear through corners or anywhere at low speeds! And contrary to popular belief.......it didn't tame the power much if any!:applause:


I didnt mean tame the power just the snappiness of it .

  • MWO

Posted May 02, 2007 - 03:54 AM

#8

Does anyone know what the stock flywheel weight is on 06 YZ 450 is? I ordered a 9oz GYT -2S297-50-50 I know it adds 9oz to the stock flywheel, my question is what is the weight of a stock flywheel? My new flywheels weighs out at 22.9oz is that the correct weight for GYT-2S297-50-50 or should it be somewhere around 27oz?


According to Engineering at Yamaha Corp. Stock Flywheel weight for an 06 YZ 450 is 14.1oz and the total weight of the GYT-2S297-50-50 Flywheel is 23.31oz::applause:

  • grayracer513

Posted May 02, 2007 - 07:31 AM

#9

What did I tell you?

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  • WFOracer

Posted May 02, 2007 - 09:35 AM

#10

The mass of the flywheel is NOT as important as WHERE the mass is located. The key to a flyhweel weight is knowing the rotational inertia of it. Rotational inertia is measured in kg-cm^2.

The stock intertia is:
'06-07 = 3.8 kg-cm^2
'03-05 = 3.6 kg-cm^2

The GYTR offroad flywheel adds:
'06-07 = +9.21 oz for a total of 6.51 kg-cm^2
'03-05 = +6.38 oz for a total of 6.20 kg-cm^2

  • grayracer513

Posted May 02, 2007 - 10:05 AM

#11

All of which is why I have so often pointed out that the weight added to a flywheel by welding on a ring weight is more effective than the same weight added as a bolt-on weight. The mass located at the center mounting flange of the bolt-on accomplishes very little compared to the weight that sits along the outer diameter.

  • MWO

Posted May 04, 2007 - 03:00 AM

#12

What did I tell you?


13oz and 14.1oz aren't quite the same, close but still not the same

  • mxracer206

Posted May 04, 2007 - 04:29 AM

#13

Looks like Yamaha offers 2 different flywheels. I have been thinking about trying one for my 05 but was wondering which would be better for MX. I think for my bike they are 3.63oz and 6.38oz more than stock. The inertia is 3.6 stock and 5.0 & 6.2. Do you think the heavier one would be to much for MX?

  • grayracer513

Posted May 04, 2007 - 08:58 AM

#14

13oz and 14.1oz aren't quite the same, close but still not the same

And I suppose 22.9 is exactly the same as 23.31? Give me a break.

  • mxracer206

Posted May 06, 2007 - 04:40 AM

#15

Come on grayracer, which flywheel would you run on an 05 YZ-450 for MX? Anyone tried either one?

  • grayracer513

Posted May 06, 2007 - 03:22 PM

#16

I'm not sure about an '05. On my own '03, I run a Dr.D 8 ounce all the time, and I heartily recommend it for an '03-'04. But the '05 has so much less hit that unless I had converted it to and earlier ignition, or a Vortex, I don't see why it needs one.

  • mxracer206

Posted May 07, 2007 - 07:45 PM

#17

I'm not sure about an '05. On my own '03, I run a Dr.D 8 ounce all the time, and I heartily recommend it for an '03-'04. But the '05 has so much less hit that unless I had converted it to and earlier ignition, or a Vortex, I don't see why it needs one.


I like the power on this motor but was hoping the flywheel would help with engine stalls. Also would this help to decrease engine braking?

  • grayracer513

Posted May 07, 2007 - 08:46 PM

#18

IMO, unless you go to a vastly heavier flywheel, it won't really have much effect on engine braking. I think that turning the idle up some actually does more. But it will help with the stalling some, and it really doesn't detract a lot from the snap of the engine.





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