Super Jet lightweight flywheel

[Vumad]

Why are you guys shoving ropes into your motor? Use the handle of a wooden hammer in the coupler if you aren't going to buy the correct tool.

 

[Vumad]

Why are you guys shoving ropes into your motor? Use the handle of a wooden hammer in the coupler if you aren't going to buy the correct tool. Might be a two person job, because iirc, the flywheel bolt takes a lot of torque to set correctly. Actually, why I'm in this thread. Looking for the flywheel torque spec right now, since I just got my #0 flywheel back. Might not be worth a bunch of money, but at $50, it's worth a shot.

 

[Matt_E]

x2 - a lighter flywheel will very noticeably decrease the motors ability to sustain power at any given RPM. Go through chop with a TL system and you'll see what I mean. The RPM's climb to the moon when the pump leaves the water and drops back down instantly when it re-enters the water. Have a ski with stock flywheel and let off the throttle and then do the same with a ski equipped with lightweight flywheel or TL - the TL ski slows down rapidly. The stock flywheel ski will keep going for quite a while.
Having TL is great for power and rev-up, but it also revs down very fast - kind of like having brakes.

That added angular acceleration and deceleration is harder on the crank, no easier.

A flywheel is just a big mechanical energy storage device, kind of like a capacitor for your motor. It absorbs a bit of power from the motor and thus takes longer to spin it up. But, that energy is available for the motor to use when there isn't enough energy from the combustion process.

 

[98gti]

 

[DementeD]

are these results superjet exclusive (701) or is this for all skis? Just read so many great reviews on lightened flywheels and now all this negativity toward them...
Wonder if the difference cant be felt because of the 701 platform having good bottom end, where maybe on something like a kawi thats known for less bottom end it may be more beneficial?...

 

[Crab]

JMHO.....stock lightened flywheels are cheap, but still not worth the money. I could not tell a lick of difference running a stocker and lightened stocker back to back.
There was a difference with a RAD flywheel, but certainly not enough to justify the price tag.

Others may have different experiences, but what I described is my own.

ditto, no need...

 

[Vumad]

are these results superjet exclusive (701) or is this for all skis? Just read so many great reviews on lightened flywheels and now all this negativity toward them...
Wonder if the difference cant be felt because of the 701 platform having good bottom end, where maybe on something like a kawi thats known for less bottom end it may be more beneficial?...

It's not negativity. It's about the application. No one questions a B-pipe because it is almost nothing but positives. The power gain easily justifies the minor increase in noise, decrease in reliability and the price tag.

A lightweight flywheel can be had for $50 (#Zero) and keep your motor reliable. It will improve your bottom end to a minor amount, but might hurt the top some, all while adding a little extra wear on your crank. If you want hit off the bottom, like most people here do, then it's probably right for you, but if you are racing, on a tight budget, or want the absolute max reliability, it may not be the best thing for you.

Everything is a trade off. Money, power, reliability, noise, ease of handling. You have to make the choice of how much of which you are willing to sacrifice to gain how much of which.

You know the sayings... "At first, you can get a lot of power for a little money, but after that, it takes a lot of money to get a little more power". A lightweight flywheel is a waste on a stock motor. But, if you have a pipe, head/high compression, ignition enhancer, reed stuffers, reeds, prop, intake, ride plate, and you just want a little more on the bottom but you don't want to go to total loss, then a lightweight flywheel might be a good choice.