Found out that you need a special tool to take off rear left hand sprocket for Roketa GK-06KTX-250WJ. Does anybody know what the name of that tool is?

You don't hook up a sprocket to a disc brake! If you mean how to mount the rear gear cluster (freewheel) on a rear wheel, a special tool is required to remove the old one, then you just screw on the new one by hand. If you mean something else then you need to explain more clearly or provide some pics.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

That requires specialized tools found in bike shops only, you can buy them but that is a one-time expense of about $100 for the tools that you may not use again.

To remove any rear freewheel or cassette you will need to purchase a Park Tool. Park Tool is the best brand when it comes to bike repair. Google Park Tool and you can look through their products. You will need a cassette/freewheel remover. There are dozens of different companies that make hubs and cassettes (gear sprocket). Take a look at yours and see what company made it. You can than find out which tool with properly fit your cassette. These tools are made to fit in a wrench making hand removal easy. Some brands will require a chain whip. The only way you will know which too you need is by find the company name on the cassette/hub. Without this tool removal is virtually impossible. If you need help narrowing down which cassette remover you need you can always let me know the company name and I will let you know the proper cassette tool to purchase.

Hi Josiah:
According with the repair guide...4.0L Engine

1. Before servicing the vehicle, refer to the Precautions section.
   
2. Drain the engine oil.
   
3. Remove or disconnect the following:
   Negative battery cable Engine from the vehicle Oil pan Engine front cover Cylinder heads
4. Lock the jackshaft tensioner by installing a pin.
   Jackshaft sprocket and chain assembly Left front cassette retaining bolt Cassette chain and tensioner assembly Rear jackshaft plug from the engine Right rear cassette retaining bolt and spacer Right rear cassette chain and tensioner Timing chain (s)
   
   

Fig. Remove the jackshaft sprocket-4.0L SOHC Engine 2000-2001
Zooming link for Remove the jackshaft sprocket-4.0L SOHC Engine 2000-2001

To install:

1. Install or connect the following:
   Timing chain(s) Right rear cassette chain, tensioner and sprocket Jackshaft sprocket and chain on the engine and remove the tensioner pin
   
2. Torque the jackshaft sprocket bolt in 2 stages:
   1. 32-35 ft. lbs. (43-47 Nm).
      
   2. Turn an additional 65 degrees.
      
3. Install or connect the following:
   Cylinder heads Front cover Oil pan Engine to the vehicle Negative battery cable
4. Fill the engine with clean oil.
   
5. Start the vehicle, check for leaks and repair if necessary.

1. Before servicing the vehicle, refer to the Precautions section.
   
2. With the vehicle in neutral, position it on a hoist.
   
3. Remove the intake manifold.
   
4. Remove the fuel supply manifold.
   
5. Remove the accessory drive belt.
   
6. Remove the thermostat housing.
   
7. Remove the roller followers.
   NOTE You must retime the LH and RH camshafts when either camshaft is disturbed. Turn the crankshaft clockwise to position the number one cylinder at top dead center (TDC).
   
   NOTE The special tool must be installed on the damper and should contact the engine block to position the engine at TDC.
   
8. Install the special tool.
   NOTE The right-hand camshaft sprocket bolt is a left-hand threaded bolt.
   NOTE If necessary, use camshaft gear torque adapter to loosen the camshaft sprocket bolt.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

I assume you're talking about the front belt drive sprocket. First, disconnect the negative side of the battery. If you haven't already done so, you must drain the primary and remove the outer primary cover. Then you must take the engine compensator nut off and the nut that holds the primary chain adjuster. Remove the circlip and pull the clutch adjuster plate out of the center of the clutch. The mainshaft nut in the hole in the center of the clutch. The nut has LEFT-HANDED THREADS on it. Remove the engine compensator sprocket, primary chain, and clutch assembly all together. Then remove the small bolt that holds the jackshaft in and remove it and the coupling. Remove the starter. Then, take the bolts out and remove the inner primary cover. Now, you can see the front belt drive sprocket. You must take the large nut off the sprocket. It too has LEFT-HANDED THREADS. You need a special deep socket and a sprocket locking tool to get the sprocket off and retorque the nut when you put it back on. This is a major job requiring a fair amount of disassembly of the bike. If you're going to change the belt, the rear wheel and swingarm must come out as well. I would high recommend that you purchase a service manual to help with this project.

Good Luck
Steve

WOW!!!WHAT A JOKE!MY KID SAVED $470 AND PURCHASED HIS MX 650 ONLY TO HAVE THE REAR FREEWHEEL BREAK THE FIRST WEEK RIDING IT.NND BY SEEING ALOT OF THE SAME PROBLEMWITH EVERYONE ELSE.RAZOR SHOULD' VE AT LEAST PUT A HEAVYDUTY ONE IN IT.OK PEOPLE LETS FIGURE IT OUT IF ANY ONE KNOWS AGOOD BEARING COMPANY,POST IT.MY KIDS BUMMED HE CANT RIDE IT

They have this on the ECHO website. Go to the FAQ page here: http://www.echo-usa.com/faqs/
You can find it by typing in 237. That's the ID # of the answer. Or you can just type in sprocket.

A tool that is like a socket goes in the center of the gears. And keeps the sprocket from spinning
And a special wrench slides over the out side gears grips gears.

Then centrifugally forced the sprocket will unscrew clockwise.
You sort of need those tools.
Or if you are good with tools. One can be made.

I'm not sure if that is what you want to do.

But yes, the sprocket is screwed on like a nut.

Hope this helps

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