Evo Clutch Drum Repair
On a 2 Speed Gearbox
You will need the following tools
2) 17mm Open End Wrenches
1)17mm Open End Wrench
If this is your first time taking off the gear box, take a few
digital pictures of the gear box area.
You will need to place your scooter off the ground.
Use a bench or a 4" x 4" block of wood.
Loosen the Long Belt Tension Screw under the deck. This
will allow the remove the rear wheel off easier. DO NOT remove the Tension
Take off the rear wheel nut. Use (2) 17mm Wrench.
Now slide out the rear wheel bolt. When you slide off the
bolt, be careful. There are 2 spacers. 1 long spacer on the right and 1 short
spacer on the left.
Line up all your parts.
Use a 5mm Allen Wrench and a 10mm Open End Wrench and take
off the 3 lower screws that holds the side plate. Remember to line up your
Take off the 2 top screws. There is 1 short top screw and 1
Now take off the side plate and line it up.
When you take off the side plate, it should look like the
Now take off the 2 engine bolts with spacer.
There are 3 spacers. 1 was where you took off the long
When you take off the screws and the spacers, the gear box
will come off. Take off the broken piece of the clutch drum and the long belt.
You will see the remaining broken piece of the clutch drum still on the gear
Use a 6mm Allen Wrench and pliers. Unscrew the Broken
piece. If the 6mm Allen Wrench side screw starts to loosen, don't worry. Do not
take off the 6mm Allen Screw. Just loosen it half way.
If the 6mm side Allen Screw loosens, Use a 7/16" Open End
Wrench and pliers to take off the broken piece of the drum.
Now replace the broken one with a new Drum. When installing
a new Clutch Drum, use the 6mm Allen Wrench and your hand. Screw on the Clutch
Make sure the Clutch Drum Center Screw does NOT stick put
Make sure the Clutch Drum Screw dos NOT stick in too much.
It should be like the picture below. About 1 to 2 threads
Now that the Clutch Drum Center Screw is set, tighten the
Clutch Drum tight.
Use the 6mm Allen Wrench and your hand.
Before you mount the gear box back on, make sure the cable
and the tension arm is in the right place.
Now put the long belt onto the gear box sprocket.
Now put the gear box back on with the 2 engine bolts and
spacers. Look back at STEP 8.
Keep the 2 engine bolts loose. Now put the Side Plate back
on. Look back at STEP 6. There are 2 washers for the lower mount screws. It is
the washer on the nut side. Do not use the 2 washers.
Now put the 2 top screws in. Use the 2 washers from the
step above. And mount it as a spacer like the picture below.
Now that the gear box is mounted on, tighten all 7 screws.
Make sure the Long Belt is on top of the Idler.
Now put the rear wheel back on. Remember the short spacer
is on the disc side.
The long spacer is on the belt side.
Do not worry about the belt. Now your spacers are set. Now
slide in the long bolt.
Now slide the belt on.
After you put on the belt, tighten the rear axle nut.
Adjust your belt tension screw. Adjust the belt so you
could push down 1 cog.
Now put your rear mud guard on. Start your scooter. Give it
some throttle. Shift from 1st to 2nd. Double check you
belt tension. Now you are ready to ride!