Post by 90GTVert on Jun 10, 2011 20:27:22 GMT -5
Lightened Flywheel
Let me start by saying I cheated and tested this modification while the 54mm cylinder was installed. I don't feel it matters much for this particular mod whether it's the stock cylinder or the 54mm.
A lighter flywheel removes weight from the crankshaft and is said to help throttle response because the engine has to fight the flywheel weight less. You can have a flywheel lightened by a machine shop and there are places that offer flywheel lightening services by mail order. If you are handy with a lathe, you could even do this yourself.
The lightened flywheel that I'm using is a stocker that has had 0.060" removed from the outer edge as shown below. I have seen people machine the face down as well to remove even more weight. I'm really not sure exactly what the limits are, because the last thing you want is to weaken the flywheel to a point where it may come apart. That could cause serious injuries. I do know that I have a few flywheels lightened as shown, and they have all held up well for me. I've only tested them on engines revving up to about 12,000RPM max.
In stock form the flywheel weighs in at 755 grams.
After lightening, 675 grams or about 10% lighter.
I took the scooter for a brief ride and I can't really say I see much difference. I believe throttle response to be slightly improved, but if didn't know there was a change, I'm not sure I'd notice a difference. No MPH increase.
I made a video so perhaps you can judge for yourself. Looking at the tach really is of little use, as the Trail Tech doesn't respond fast enough, so you'll have to use sound more than anything.
Let me start by saying I cheated and tested this modification while the 54mm cylinder was installed. I don't feel it matters much for this particular mod whether it's the stock cylinder or the 54mm.
A lighter flywheel removes weight from the crankshaft and is said to help throttle response because the engine has to fight the flywheel weight less. You can have a flywheel lightened by a machine shop and there are places that offer flywheel lightening services by mail order. If you are handy with a lathe, you could even do this yourself.
The lightened flywheel that I'm using is a stocker that has had 0.060" removed from the outer edge as shown below. I have seen people machine the face down as well to remove even more weight. I'm really not sure exactly what the limits are, because the last thing you want is to weaken the flywheel to a point where it may come apart. That could cause serious injuries. I do know that I have a few flywheels lightened as shown, and they have all held up well for me. I've only tested them on engines revving up to about 12,000RPM max.
In stock form the flywheel weighs in at 755 grams.
After lightening, 675 grams or about 10% lighter.
I took the scooter for a brief ride and I can't really say I see much difference. I believe throttle response to be slightly improved, but if didn't know there was a change, I'm not sure I'd notice a difference. No MPH increase.
I made a video so perhaps you can judge for yourself. Looking at the tach really is of little use, as the Trail Tech doesn't respond fast enough, so you'll have to use sound more than anything.
Please put the pitchforks and torches away. 
It'll return, but I have to finish out the stuff I was doing with the stock cylinder. 
