85r Lighter Flywheel

[2hundredx]

http://cgi.ebay.com/ebaymotors/Honda-ATC250R-Ricky-Stator-Lighter-Flywheel-85-86-/380303713399?pt=Motors_ATV_Parts_Accessories&hash=item588bde2477 Is this worth it does it help much? thanks, collin

[Dirtcrasher]

Thats too much$$, I have the mandrel for them and do them for 50$ shipped.

They do help it get up to higher RPM's faster but you lose some decompression braking with less rotating mass..........

[Mosh]

I agree with DC.
Typically, you do not want to alter your stock flywheel wieght unless you want to drag race.
The heavier mass of the OE wheel helps the engine torque better on the low end. If you are a trail rider or MXer, you may want to leave it stock.
You would better off to use that money for a CR headgasket. You will notice more power from that than a lighter flywheel.

[cr480r]

reducing flywheel mass does not increase or create power. It will not show a noticable difference on a dyno. It will however make much more wheelspin and make the bike more difficult to ride. It will "feel" faster even though its probably actually slower. Dirtbike guys often add weight. Too much weight can make the bike lazy, but on atv's the factory usually got it right.

[Dirtcrasher]

^ About the only way to find out if the factory "got it right" (for us guys without access to Dyno's) is to try your OEM flywheel as is and have a spare thats lightened to try immediately afterwards.

A lightened flywheel does not make more power, I agree, it just helps the motor rev up faster IMHO..........

I lightened DEEPA's flywheel and built him a long rod 250R motor; He is very happy with the combination and were pretty certain that we won't be tearing it down for quite a few years/hours on that motor; At which point it should merely need rings or the next up bore.....

[bcredneck]

i thur my xr 75 flywheel on a lathe and made it lighter then i balaced it after all that work i had a motor that reved high and sucked on hills so i got another stock one and welded weights to it much better on hills but revs slow if you want power when you dump the cluch leave it stock or add weight if you want a gutless motor that revs high make it lighter i learnt stock is the best after hours of worck and about $160 save your money and get a pipe if you want more power i wish i did

[Dirtcrasher]

I'm very happy with my 87 200X lightened flywheel, it revs up quick!

BC, you can't compare an XR75 "i thur my xr 75 flywheel on a lathe and made it lighter then i balaced it after all that work i had a motor that reved high and sucked on hills so i got another stock one and welded weights to it much better on hills but revs slow if you want power when you dump the cluch leave it stock or add weight if you want a gutless motor that revs high make it lighter i learnt stock is the best after hours of worck and about $160 save your money and get a pipe if you want more power i wish i did"

Completely different animals.











.

[NINJA]

I'll take a lightened flywheel over stock any day on the dunes.

[cr480r]

I'll take a lightened flywheel over stock any day on the dunes.

there may be some gains on sand where some tirespin is actually desireable. But it not like your gonna put a pvl on a stock 250r and start whipping everyones ass..


BC, you can't compare an XR75.... Completely different animals.

while they are different animals, the flywheel has the same effect.. the results were just exaggerated on the little engine.

[bcredneck]

quote while they are different animals, the flywheel has the same effect.. the results were just exaggerated on the little engine. exactly fly wheel modds have the same effect on anthing just the more power the less of a differece ive been experimenting with my xr for 4 years so i dont mess up big motors that cost more money for parts i never mod a big one till ive tryed the mod on my xr doing this has saved me from messing up a few motors when people tell me to try dumb mods on theres one of the best things ive ever tryed is thouse cheap n02 kits for pocket bikes with a electic 2 storke oil injector thats wired to the n02 swich wicked on hills when you dont think your going to make it

[Vootie]

I run a lightened flywheel in my blaster and love it. And yeah, I ride trails with it.

[NINJA]

there may be some gains on sand where some tirespin is actually desireable. But it not like your gonna put a pvl on a stock 250r and start whipping everyones ass..


I didn't say anything about a PVL or whipping anyones ass. But since you want to argue about flywheels and what affect weight has on them I'll delve into it a little more. The stock flywheel on an ATV engine is usually on the heavy side from the factory. The reason for this is that extra rotating mass stores energy and makes shifting and rideability easier for the general user. The thing is though, that extra rotating mass takes longer to get moving thus affecting your acceleration negatively. The lighter a flywheel is the quicker the engine can rise and fall in RPM range allowing it to deliver it's peak power at a faster rate during acceleration. The place where a lighter flywheel will hurt you the most is on a steep hill. On the track, dunes, or dragstrip a lighter flywheel is a good mod to have. Lightening a flywheel can have up to a 15% greater affect on your acceleration than taking weight off the rest of the machine. It's a cheap but very effective mod. Of course you better work on your shifting skills to utilize it.
A real cheap mod for you guys with 86 250Rs is to put on an 85 flywheel, it's 60 grams lighter.

I can promise you, if you took whatever machine you had with it's stock flywheel, and timed how long it took you to go from 0-60 it will be slower then when you put on a lightened flywheel and do it again.

[willrideanythin]

I think that a good price for a replacement wheel, Just because you the man DC doesnt mean every one has access to here or you.

When I ran Z400s and the clones, A light wheel was great. The stockers are chunky. I ran a DRZ wheel (-8 oz) and loved it. trail tech sold a -16 (Zs)/-8 for the DRZs.

[Dirtcrasher]

^ I'm just a small shipping charge away..........

22 350X heads now, dozens of forks unbent, you name it :D

[cr480r]

I can promise you, if you took whatever machine you had with it's stock flywheel, and timed how long it took you to go from 0-60 it will be slower then when you put on a lightened flywheel and do it again.

maybe with a light rider, short gearing, and great traction.. its definately not for everyone.

[NINJA]

maybe with a light rider, short gearing, and great traction.. its definately not for everyone.

Yes I certainly agree, it's not for everyone and shorter gearing does help. It has much more to do with throttle and clutch savy than rider weight though.

[NOS_350X]

I have yet to find someone that has riden any of my bikes that all have lightened flywheels that didnt love it. On a stock flywheel all you get is a faster RPM response to your throttle position. THAT IS IT. The oem flywheels are so heavy stock you arnt going to notice a massive loss anywhere. And if it was such a bad thing why is everyone going to the CR setup with its minature flywheel? Ya it has a better timing curve but the flywheel weighs nothing. And from what yall are saying that would be a bad thing. I beg to differ.

[Dirtcrasher]

I have the 350X and 250R mandrel for lightening these. Shoot me a PM or email if interested.

[NOS_350X]

I will say, FOR THE MONEY, a lightened 350x flywheel is the BEST MOD YOU CAN DO!!!

[cr480r]

if the engine winds up faster its cuz your tires are spinning.. yes that can be faster but not always

[Julle74]

I have a Trailtech lightflywheel on my supermoto, and the throttle response is better! Pics up the frontwheel much easier then with the stock F.W. And it surely doesent just spinn the wheel.

[cr480r]

hmm.. who woulda thought a four stroke on asphalt would hook up?

[willrideanythin]

Its less rotating mass, Thus faster RPM gains.

In my simple lil mind Im guessing they might even cause you to rev higher, Even if slight. I understand the pipes and other things dictate RPM limit. I just saying compared to stock.

[cr480r]

Actually heavier flywheels will hit higher rpms. No doubt a light flywheel mass can accelerate faster, thus the increase in throttle response and loss of traction.. but you will find in the upper gears where traction is good and the rate of rpm climb is slower, that the engine will pull the same because the horsepower and torque has not changed any.. A light flywheel may be good for a tacky motocross track, or a tight circle track where rpms can vary greatly. but for all around riding and drag racing i've found more disadvantages than anything else. although my experience is limited to a tecate 3, a lt250r, a banshee, and a friends cr500.. I am not saying people should not lighten flywheels, but I dont think its a worthwile mod for most.

[NOS_350X]

Your judgement of where a light flywheel is good and isnt is completely off. I Do ALOT of drag racing, and much more flattrack/tt racing on a banshee. On a big track you want the light flywheel. Small tracks you might want to add weight. And on a drag race there is a reason every drag banshee has a PVL. I have ran them on the ones you listed (except lt250) AND many more, trx, yfz, and LTR 450's, MANY other cr dirtbikes, LT500's, t4, those are just the ones that come to mind. The fact is faster peak RPM's= faster accleration. AND your wrong you will not get more RPM's with a heavy flywheel that one makes me laugh right there.

On my shee it defently pulls hard in the top gears with the lightened flywheel too.

On a tight MX track you need the weight of the flywheel to keep the engine moving luging it out of a trun.

[cr480r]

the engine will lug either way. the heavy flywheel does not create or add any torque. just momentary inertia. on a big track you are probably going fast, so you are probably in a high gear.. so traction is probably good . on a motocross track you need the weight for traction, if traction is good then the lighter is probably better. and the fact that you laugh at higher rpms proves to me you got some learning to do. at high rpms a heavier mass will help keep engine speed up in between power pulses.... and most banshee guys run pvls because other banshee guys run pvls.. 250r guys swap to cr because it is digital..

[NOS_350X]

Ya whatever dude.

I know guys with banshees that have more money in dyno time than you have in all your bikes. But let me tell ya, the dyno's lie.

EVERYONE LISTEN TO CR480R!!!

(because as long as you do i know will be faster)

[cr480r]

you probably know banshee guys with more money than common sense. and I could give a **** less what you or anyone else thinks. Its my opinion, and right or wrong its here for others to take as they want. Heavier is not better. Lighter is not better. Just right is best. And that varies from rider to rider and bike to bike. My whole intent was to keep you guys in check.. if nobody did every noob on this site would be lining up to get a flywheel cut, thinking that without it they would be slow.. not necessarily true.

[Dirtcrasher]

Relax guys, you obviously have some brains which is not a 3WW membership requirement, although it is very much welcomed.

I argue, I argue plenty of times but it's all about DISCUSSION and backing that up with facts/readings/dyno's etc etc etc etc.

No reason to have any "spoiled brats" here. Just share your point of view or your thoughts about a particular subject.

I've learned plenty from NOS, who seems to be a wealth of knowledge and not afraid to share some of it; There is always something to share......... And THATS what makes us faster and there is always a "give and take".......

This isn't 3WW 1st district court. The board is all about sharing and learning. Disagreements will happen but facts back them up. Or, someone seeing or riding a givin mod is lots of help..... Hands on is the best results we can ask for. Unless an ex pro wants to share.

[cr480r]

Interesting read, doesnt say much about drag racing or atv's though.

http://www.thumperfaq.com/mxa_flywheel.htm

[NINJA]

Interesting read, doesnt say much about drag racing or atv's though.

http://www.thumperfaq.com/mxa_flywheel.htm
" Only one aftermarket firm designs their weight by measuring the moment of inertia.

QUESTION 22: HOW DO THEY MEASURE INERTIA?
World Four-Stroke and Veteran Champion Doug Dubach is a fulltime test rider for Yamaha who just happens to own DR.D racing, which sells flywheel weights. When Dubach set out to design flywheel weights for DR.D Racing, he borrowed Yamaha's moment of inertia tester."

Way to sell a product.

[Marty]

Well here is my question, why did Honda put a 60g lighter flywheel on the 1985 ATC 250R. But the 1986 Honda TRX and ATC 250R and the 88 and 89 TRX 250R had 60g heavier flywheel on them. What is right and what is wrong?
I owned an 1985 ATC 250R and that motor was a beast and was easy to ride at the dunes never stalled at dunes and went up steep hills easily with that lighter flywheel.