lighter inner pulley

vette76 · Post by **vette76** » Thu Apr 14, 2005 8:44 pm

i noticed that the inner pulley on the engine is very heavy. a lot of material can be taken off this. would it help to make this lighter so there is less stress on the motor and more power goes to the wheels? or does this have an important purpose?

darat · Post by **darat** » Thu Apr 14, 2005 9:10 pm

how would u make it lighter

vette76 · Post by **vette76** » Thu Apr 14, 2005 9:22 pm

grind or machine down the back of it until there is about 1/16 of material left at the top.(it will get thicker closer to the engine,the way it is made.

Post by **noiseguy** » Fri Apr 15, 2005 12:48 pm

? The inner pulley is aluminum. It has cooling fins on it to circulate air. I wouldn't remove those.

Now the alternator side you might be able to lighten, but I've never looked at it closely. There tends to be more weight there. MC racers remove the alternator (and starter) for racing, and charge the battery b/t races. But they don't run headlights either. You would also need to keep the fan in there, as it cools the engine.

vette76 · Post by **vette76** » Fri Apr 15, 2005 2:14 pm

the inner pulley is supposed to have fins? mine doesnt. can u post a pic of what it is supposed to look like?if its not too much trouble.

vette76 · Post by **vette76** » Fri Apr 15, 2005 2:53 pm

my inner pulley is made of steel because a magnet sticks to it.i do remember breaking the inner pulley off an 84 tho and i think that was aluminum because of the way it broke. it probably weighs 3-4 lbs. it is the width of a dime and doesnt need to be. so if i made it lighter would it help performence? here are some pics.i just want to run it by u first because if it helps to spin the engine i will leave it alone.

vette76 · Post by **vette76** » Fri Apr 15, 2005 3:09 pm

i just took a look at an 84 and it does have fins an is made of alumninum. why is this different? i am guessin that it wont make a difference then since the 84 is lighter then the 87. this isnt acting like a flywheel is it so it wont bog? i will wait for ur response before i go and lighten it up.weird. i thought it was the same. would it effect anything if i lightened it up?

Post by **noiseguy** » Sat Apr 16, 2005 2:54 pm

Odd. Looks like it's spaced to replace a variator. What year's that from?

Try running the aluminum version to see if it fits; easier that machining.

Nice thing is that you can run a larger pulley diameter with that half, ala the pulley mod.

vette76 · Post by **vette76** » Sat Apr 16, 2005 5:31 pm

i dont have the aluminum one. it broke. it is off of an 87. so will i be alright if i machine it down? would it help any?i noticed u said about a variator. do u think it would fit?that shaft looks pretty similar.ive noticed the clutch on those look the exact same too. even on the 80.

http://www.scootertherapy.com/elitesclutch2.jpg

Post by **noiseguy** » Sun Apr 17, 2005 11:39 pm

Well, if a variator would fit yours, I've got one from an Aero 50 I'll sell you. It won't fit the Spree, it's too wide and thick (answering that question so often raised.) It might fit yours, which would help you out. Measure your inner pulley width (front face to back face,) the hole diameter and thickness for the shaft, and the diameter of the overall pulley, and post them.

vette76 · Post by **vette76** » Mon Apr 18, 2005 1:59 am

ill do that when i get a chance, but the spline shaft is the same as an 84 i found out.

Spreed · Post by **Spreed** » Fri Apr 29, 2005 2:29 am

I can tell you guys now that the thicker heavier one pictured is from the 87 engine. The thin, light aluminum one with the fins (about 1/3 the weight) is from the 84 engine. I know this because I have both motors, and am going to try which one is better overall for daily riding, trying both these pulleys on an 87 engine. That is, of course, after I get this darned thing to hold idle... I cleaned the carb but I think the idle circuit is still dirty based on what I read on other posts. (if anyone can help, so that I can do the pulley test and post results sooner: My scooter starts when cold, and can rev up when given throttle, but then bogs and dies and then either can't start, or starts for a split second and chokes and dies. Giving it throttle at this point doesn't help it start or run. Please PM me if you know what's going on, thanks.)

vette76 · Post by **vette76** » Fri Apr 29, 2005 10:25 am

that might be a sighn of low compression too.

zoom · Post by **zoom** » Thu May 05, 2005 10:48 pm

How do yall get the pulleys off ?

BluPhire · Post by **BluPhire** » Fri May 06, 2005 11:00 am

use an Impact Drill and have it turn the normal way to get the nut off (Counterclockwise).