Flywheel Weights

[redrocket190]

Err....try it with and without and see what you like best?

[hoofarted]

I have been wanting to try one as well...curios as to how it does.

[Gix]

FWIW..
I tried one on my supermoto...just to see if it would help getting the power down out of tight turns in the wet.... it did, but made the bike feel dull every where else.
It's now sat in a cupboard gathering dust.
Just remember, there's always a trade off, if there wasn't Honda would've made heavier flywheels

[JBaze]

I would still like to try one, as I do more trail and play riding. I think MX is all over for me. But I would like to play around with it anyway.

[Roostius_Maximus]

its deffinately got its places, i"d like to try the 250 ignition, stock 500, and the weighted in one afternoon just to see where its best

[nmdesertrider]

I'd swear they don't turn as well with a flywheel

[Roostius_Maximus]

could be
I know at the speedway (355cid class) i have a guy that runs on the inside of the track, his stuff is all lightweight rotating assembly, short stroke, big bore, 1.880 rod pin and superlight crankshaft. It really hooks hard and pulls out of the corner like unreal,
but the other guy in the same class likes to run at the top of the track, he prefers the heavier rotating assembly with a regular stroke crank and regular bore block, a 2.100 rod pin and heavier crank.
I'd sent multiple engine combinations to the customers to run, 2 within what i figured was their preference, and one way out. I'd watched them drive before and specifically built to suit their driving style, but wanted to see which they'd choose.
They'd never realized why buying an engine package same as some dude won a championship never got them up front, til they bought one designed for them. They've been 1st and 2nd in points for 4 years now.

[mega491]

I noticed when you rev a FWW equipped CR500 in neutral it doesn't idle down as fast as non FWW, almost like a lean pilot. I also don't like the way it caused the front end to float up when I launched the bike off a of jump. Jumps front end high.

[lewisclan]

Ive had a few of them on diffrent set ups and like em for trail bikes

[MICK]

I noticed when you rev a FWW equipped CR500 in neutral it doesn't idle down as fast as non FWW, almost like a lean pilot.

It always does this. Come hot into a corner and chop the throttle...SURPRISE!!! Engine doesn't come down off the pipe...you take a dirt knap.

I also don't like the way it caused the front end to float up when I launched the bike off a of jump. Jumps front end high.

Same bullshit. Chop the throttle on takeoff, but the heavy FWW spools the motor back up like you cracked the throttle. An experience you don't want to repeat more than once in high gear...

I understand a lighter flywheel is more prone to stalling. But that's what that little lever on the left side of the bars is for. Use it. A lighter flywheel builds power as slow or fast as you want it too. It's all in your control. A lighter flywheel also lets the motor calm down faster coming into corners or blazing through trees. Actually, physically takes less energy to make the bike change direction. You can't mickey mouse a heavy flywheel. Physics is physics. For every % you've increased traction (aka made you layzier) you've effectively reduced handling an equal amount. I used FWWs forever...and loved them. Until I learned to ride without. Looking back now I wonder why in the hell I ever used them in the first place?? Bottom line is you've got to try your bike with and without them. Back to back. Decide for yourself.

[AlisoBob]

I understand a lighter flywheel is more prone to stalling.

The price of the weight is damm near the price of a PWK.

The PWK help's allot in the stalling dept.

[MICK]

The PWK help's allot in the stalling dept.

Yes! And ignoring the idiots who tell you bikes aren't supposed to idle

[CR500PHIL]

I understand a lighter flywheel is more prone to stalling.

The price of the weight is damm near the price of a PWK.

The PWK help's allot in the stalling dept.

I think the FWW will be coming off. Actually I am thinking of buying a new PWK for my CR500AF project. I am trying to decide between 38mm and 39mm - anyone have any suggestions? Any problems with the bigger carb? Does the larger carb have the same low end throttle response?

[MICK]

Generally speaking the larger the carb the less bottom end it has a tendancy to produce. The greater volume reduces air velocity. How much difference does 1 or 2mm make? I couldn't tell ya. But Eric Gorr says the 39.5 produces 3hp on top! For what it's worth my bike came with the larger PWK from Service Honda and it runs smoother than I previously thought a CR500 was capable of on the bottom. And makes a good deal of power on top. My vote is cast for the 39, but since we're talking AFs here I don't think you're going to mind one way or the other. Get that thing AF'd and you'll be happier than you could ever imagine.

One thing though. Don't take guidance from this forum blindly. I am not you. I do not ride like you. Our bikes are built for completely different reasons. A FWW could turn out to be your best mod. I am not qualified enough to tell you a FWW would be as bad a decision for you as it is me. I've put my seat time in both with and without. I chose not to run them today for very good reasons.

[Roostius_Maximus]

I never liked it on my 88 engine in my 88 either, and expecially on the 86 engine in my 88, but the 00 in the 00 is nice, and the 91, but they're otherwise stock.

I havent had a chance to try a pwk yet, but i'm not going to turn the engine over in my AF without one.

[AlisoBob]

Don't take guidance from this forum blindly. I am not you. I do not ride like you. Our bikes are built for completely different reasons. A FWW could turn out to be your best mod. I am not qualified enough to tell you a FWW would be as bad a decision for you as it is me. I've put my seat time in both with and without. I chose not to run them today for very good reasons.

Yup....

[MICK]

While I'm thinking about FWWs. I'd also like to mention how I think they're made like garbage. Somebody (insert name here) made a very good point about the rediculous design of Steahly's FWWs for instance. I've thought for a very long time they should be made like this:

Jeff Ward's 1991 SR500 flywheel. It's got an 11oz brass ring.

[JBaze]

After reading your posts Mick, I think I will stay with the stock fly wheel and my Barrnet Steel clutch. To much BS to go through just to help keep it from stalling. Seems like alot of expense for not much return.

[dannygraves]

yeah, I was bitching about that a while ago. it should be a ring to create as much inertia as possible while reducing rotating mass. the fact that they make it disc shaped means that it will slow the motor down more and weigh more while have less of an effect as a ring shaped weight.

[MICK]

yeah, I was bitching about that a while ago. it should be a ring to create as much inertia as possible while reducing rotating mass. the fact that they make it disc shaped means that it will slow the motor down more and weigh more while have less of an effect as a ring shaped weight.

Bingo! You're the man...

[CR500PHIL]

Generally speaking the larger the carb the less bottom end it has a tendancy to produce. The greater volume reduces air velocity. How much difference does 1 or 2mm make? I couldn't tell ya. But Eric Gorr says the 39.5 produces 3hp on top! For what it's worth my bike came with the larger PWK from Service Honda and it runs smoother than I previously thought a CR500 was capable of on the bottom. And makes a good deal of power on top. My vote is cast for the 39, but since we're talking AFs here I don't think you're going to mind one way or the other. Get that thing AF'd and you'll be happier than you could ever imagine.

One thing though. Don't take guidance from this forum blindly. I am not you. I do not ride like you. Our bikes are built for completely different reasons. A FWW could turn out to be your best mod. I am not qualified enough to tell you a FWW would be as bad a decision for you as it is me. I've put my seat time in both with and without. I chose not to run them today for very good reasons.

A Scary Fast insert increases carb air velocity at 0 to 1/2 throttle and may help the bigger carb at lower RPMs. It made a noticable difference to my YZ 250. I just emailed Scary Fast to see if one can be obtained for the PWK 39 - which I am sure it perhaps can but since their product is sold by bike model and the PWK 39 is not the OEM carb for CR 500s I had to ask to find it.

[dannygraves]

The PWK 39.5 is oem on the KX500 if that helps

[CR500PHIL]

Scary fast wrote me back and said they offer the scary fast insert for both the 38 mm and the 39 mm PWK carbs in case anyone is wondering. I am not sure if the 39.5 mm and the 39 mm take the same insert - I would imagine they do. So I guess my engine with have vForce, 39 mm PWK with Scary Fast and the FWW is coming off.

[AlisoBob]

Pass......

[britincali]

This is the only thing you can bolt to a CR500 to make it "scarey fast"