I need to tone my bike down a bit, 2004 yz250 so i am about to purchase a 13oz flywheel weight. I pretty much a beginner so i want the heaviest flywheel weight possible. Will there be a dramatic affect on the bikes hit with this heavy of a flywheel weight, if not, what else can i do to the bike to make it easier to ride. Oh yea im gonna be doing mostly trail riding, no track riding at all. Im 5'10 5'11 210pds, thanks guys
13oz flywheel weight
- Thread starter ruffstff
- Start date
The 13oz weight is a nice smooth power delivery. But this bike WILL still have a huge amount of power in the woods. What the weight will help is keeping rear tire from spinning up and trying to pass the front everytime you give it gas. It will also let you lug it a bit more without stalling as easily. I had a 13oz first and went to a 11oz. There was nothing wrong with the 13oz at all I just went to the 11oz because it was what I originally wanted for the bike but was out of stock at the time. The bikes powerband will still be the same it will just be more controllable and tractible. As for detuning the hit I am not sure the best way to do it. It will never be smooth like a ktm250 exc or anything but man it will rip on the straights when those wont. You can change the powerband with pipe/silencer combos but I am running stock so I dont know which would be best. You could also try some porting work by Eric Gorr, I think he can shape your power the way you want, but I personally have never tried it.
KaTooMer
~SPONSOR~
- Jul 28, 1999
- 435
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The flywheel weight makes it so it doesn't rev quite as quickly, which helps you feel like you're more in control of the back wheel. And with more weight, there's more inertia being driven by crankshaft which means the engine doesn't come to a stop as quickly when you pull in the clutch (i.e. less stalling...and I'm sure my physics terminology isn't completely correct, but the concept is, I think). I use an 11-oz weight on my KX. People who ride KTM 4-strokes (and sometimes the 2-stroke off-road models) complain about it stalling even with the flywheel weight, but it doesn't bother me. It's still got a hell of a hit and I like that bike more and more each time I ride it.
I put the 13 0z on my RM and it does make a difference, but not what I expected. Not as big a change. I can wheelie much easier now without it flipping over, I noticed that immedeately, And it will Lug down lower without stalling, but I'm either downshifting or feathering the clutch before I hit that point anyway. In that aspect it will help keep you going when you are gonna stall the engine on a long steep twisty hill that takes everything out of you. It's a nice addition and I would do it again. I guess because I'm a spode, don't race, and ride a lot of tight woods, it was a sensible mod to make for me.
If you really want to tone your bike down you can loosen up the preload spring on the powervalve (exhaust valve). It's an external adjustment and only take a few minutes to accomplish. I think your bike will have the adj. externally.
Mine was set stock at 90 deg clockwise from zero tension. I've had it set at zero tension and 45 deg clockwise. Both made the bike run a lot flatter for low rpm woods, less tiring with still plenty of grunt. You can set it however you like and adjust it as you go. It WILL make a big difference if you want to tone it down and costs zilch. Look it up in your owner's manual and see what you can do. It could be the ticket.
Now with the weight on and 2 yrs riding behind me I have the PV set to stock. It comes in handy where I only have a short distance to pick up a lot of momentum and speed. You will eventually end up setting it back to stock with some time too.
Please Update whatever you do as I'd like to know what happens and your impression of the FWW and/or PV adj.
Chief
If you really want to tone your bike down you can loosen up the preload spring on the powervalve (exhaust valve). It's an external adjustment and only take a few minutes to accomplish. I think your bike will have the adj. externally.
Mine was set stock at 90 deg clockwise from zero tension. I've had it set at zero tension and 45 deg clockwise. Both made the bike run a lot flatter for low rpm woods, less tiring with still plenty of grunt. You can set it however you like and adjust it as you go. It WILL make a big difference if you want to tone it down and costs zilch. Look it up in your owner's manual and see what you can do. It could be the ticket.
Now with the weight on and 2 yrs riding behind me I have the PV set to stock. It comes in handy where I only have a short distance to pick up a lot of momentum and speed. You will eventually end up setting it back to stock with some time too.
Please Update whatever you do as I'd like to know what happens and your impression of the FWW and/or PV adj.
Chief
DirtDragon
Member
- Oct 22, 2003
- 21
- 0
This is next on my mod list for my 2000 KX250. Probably going to order the 13oz next week.
I have a 6, 8, and 10 oz kit that fits my YZ 250. There is not agreat deal of difference between any of the weights.
It is an excellent product, but the small weight changes do very little for the power characteristics. The 6 is difficult to notice. The 10 oz makes it easier to follow my nephew around on his xr 50. Once the powervalve opens, the bike feel fast no matter which size is on. I also get better tire life with the weight on.
It is an excellent product, but the small weight changes do very little for the power characteristics. The 6 is difficult to notice. The 10 oz makes it easier to follow my nephew around on his xr 50. Once the powervalve opens, the bike feel fast no matter which size is on. I also get better tire life with the weight on.
I tried out my Honda cr250 yesterday with the steahly 13oz for the first time,
I rode tight single track woods....did not stall and made it like a tractor. Still v powerfull.
I then rode flat out field riding...drag racing!! It made it very fast in a straight line, the rear wheel did not spin as much, it was easier to control and great fun. I would not think i would be faster on the mx track without it, but will let you know on monday!
I rode tight single track woods....did not stall and made it like a tractor. Still v powerfull.
I then rode flat out field riding...drag racing!! It made it very fast in a straight line, the rear wheel did not spin as much, it was easier to control and great fun. I would not think i would be faster on the mx track without it, but will let you know on monday!
The more I see on this board about flywheel weights, the more it seems that the amount of effect a weight has on your bike depends on what bike you are modding.
My bike for instance has very little crankweight to start with and the weight had minimal effect whereas owners of other makes, models, year, report significant changes.
Just an observation.
Chief
My bike for instance has very little crankweight to start with and the weight had minimal effect whereas owners of other makes, models, year, report significant changes.
Just an observation.
Chief
I just ordered a 12 oz. for my 1999 CR250, I will see what the improvements are, my friend has a 12 oz. on his CR and loves it. I was also thinking of going up a tooth on the front sproket, I think that will help for woods riding also, will not have to shift as much as stock gearing.
http://www.steahlyoffroad.com
This is where I ordered my flywheel weight, I don't see anything bigger than a 14 0z. for a KX500, should do the trick!
This is where I ordered my flywheel weight, I don't see anything bigger than a 14 0z. for a KX500, should do the trick!
dirt bike dave
Sponsoring Member
- May 3, 2000
- 5,348
- 3
jducati said:
IMO, adding one tooth on the countershaft will be more change than you want. I would recommend keeping your stock 13t front and replacing the 50 tooth rear with a 49 or 48. I run 13/49 on mine, and even the small change lets you hold gears noticieably longer, for less shifting.
BTW, I think you will like the flywheel weight alot. Mine has an e-line system, which adds approx. 12 ounces. With a V-force reed block, FMF Turbine Core silencer/spark arrestor, the '99 CR has great low end for a 250 two stroke.
I agree with Dave, countershaft sprocket makes too much of a difference in either direction. Changing the CS can create more problems than going up or down 2 teeth on the rear. Going bigger on either sprocket is better for your chain and sprockets (credits to Jaybird)
Also remember, once you are out of first you won't feel any difference since your 'gearbox' still has the same ratio gear to gear. You'll only feel it in 1st and last gears, but it's a good idea, I never thought about going up a tooth in ft or down in rear for woods. Gearing higher with sprockets, that would prolly gimme too tall a first gear. It's not going to widen your shifts.
Joe
Also remember, once you are out of first you won't feel any difference since your 'gearbox' still has the same ratio gear to gear. You'll only feel it in 1st and last gears, but it's a good idea, I never thought about going up a tooth in ft or down in rear for woods. Gearing higher with sprockets, that would prolly gimme too tall a first gear. It's not going to widen your shifts.
Joe
Yes YZ,
That's the way it is on my bike. When you loosen the 2 nuts, pay attention to which direction the knob returns to. I would try somewhere in between where it was set before you loosened them and zero tension (where the knob returns when you loosen the nuts).
Joe Chief
That's the way it is on my bike. When you loosen the 2 nuts, pay attention to which direction the knob returns to. I would try somewhere in between where it was set before you loosened them and zero tension (where the knob returns when you loosen the nuts).
Joe Chief
Lorin
LIFETIME SPONSOR
- Jun 25, 1999
- 948
- 0
My riding partner has an 03yz with an 11 oz flywheel and a pro circuit pipe, and he rides it as a woods bike. I have spent time on another 03 yz with a fatty pipe (no weight), and would say that the flywheel weight helps considerably with that motor. I would also have to say that I prefer the pc pipe to smooth out the midrange hit of the 03 \ 04 motor, as well as having a little more over-rev than the FMF.
