Lightened Flywheel

[Sandfrk33]

Just wondering who has an opinion about lightened flywheels. I've heard you get faster acceleration, but are there any downfalls to running them. Let me know what you think.

[tundish2800]

Hey are supposed to make the bike rev faster. Less rotational mass. Only bad thing if they are not done right hey will grenade that side of your motor.

[sandman81]

Yeah the rap up faster but If your a little on the heavy side, it wouldn't be a good idea to lightened.

[Sandfrk33]

I'm alot on the heavy side. Not fat ,just big boned.

6'3'' 240

[bansheesandrider]

I wouldn't in your situation. I am 220 now, down from 250, and I did not do mine for that reason. A lightened flywheel will rev faster, but it will be easier to kill the engine if it gets lugged down.

[firebanshee]

I am 6'2 235 and had a lightend flyweel on my alky bike and bogged out of the hole at times, i put a stock one back on it and now i never bog.

[jbooker82]

I am a big guy too. I had one on my dune ported 4mill. I had it on there for 1 ride. I didn't like how it felt. It did ref faster but is also fell off the pipe a lot easier. I whish you could get a good quality flywheel that was 16oz or so heavier. That would be awesome for woods riding.

[sandman81]

I'm alot on the heavy side. Not fat ,just big boned.

6'3'' 240

 

Same reason i havent done, 6'2" and getiing close to 240, but im not big boned just fat.

[WINDYCITYJOHN400]

Your not big boned...or fat.....your a fully gusetted race chassis. Skinny book types aren't built for speed. LOL.

 

 

But it wouldn't hurt for you to lay off the damn bacon.

If the car seats slid all the way back...and you have to recline the seat to fit the tummy....McFatty's shouldn't be part of the race season diet....or the off season. LOL.

[tundish2800]

I have one i weigh 240 and mine does not bog. I only drag race when i leave the line the engine is revving to the moon. IT can't bog down

[NickisGod]

here's my flywheel.

 

Its super light,almost unbeivable and has unliminate throttle response. As soon as I gas it the tires roast and about the rpms considering its a two stroke that's a good thing thing because I'm always off and on the throttle so it makes it easier for me to corner and ect

[J-Madd]

I run them on my smaller motors. BUT I have had 2 slightly come apart enough that the magneto was bad/out of time, and one the started the shred on the outer radius. Looks like razor blades sticking out of it. We probably just had too much cut off of them....most of them lasted 3 years or so. I wouldn't hesitate to run a lightened flywheel for 300 ft drag racing with any rider weight. Just inspect them often, or don't get too greedy on the lathe.

 

 

On bigger motors (14 mil+), I don't think it's such a good idea (nor is it needed, imo.)

[shanYE west]

heavy flywheels could have a advantage over lightend at the track as well. The extra crank inertia will help hold rpms at shift points and will give more leverage on the launch (help with boggin at the line). CP had a big write up about this over on PS awhile back. Heavy flywheels also smooth out the powerband and increase traction. Traction is always a good thing.

 

I only use lightend flywheels for dune riding.. I use heavy flywheels for trails and track.

[bigborebanshee]

Good mod for a stock bolt on motor with some portwork. After a 4 mill or big bore,I didn't see any difference.Great mod for Mx since you need that explosive power and your already running a small lightweight tire setup.

[FASTOYS]

I have tried them on the track, on the hill, and on the dyno. If you want a bike that "sounds fast" then lighten it. I do NOT prefer them on our motors. Just my .02