How to remove sprocket forom ht101 - Stihl HT101 Pole pruner

I'd say you have a fouled plug clean it up and regal it or replace

take the cutting head off --loosen the housing at the base

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/david_2f6e03df6c124197

yes grease the drive shafts. there is no greasing point, you have to remove the attachment and remove the inner shafts. Heres the manual, hope it helps
http://www.mediafire.com/view/a33fr2038d5u1cr

Timing Chain: Service and Repair
REMOVAL
Tools Required = Crankshaft Sprocket Puller
1. Remove the timing cover.
2. Remove the crankshaft position sensor reluctor ring.
3. Remove the camshaft sprocket bolts.
4. Remove camshaft sprocket.
5. Remove timing chain.
6. Remove the crankshaft sprocket.
7. Remove crankshaft sprocket key.

INSTALLATION
1. Install the key into the crankshaft keyway.
2. Use the crankshaft balancer installer to install the crankshaft sprocket.
3. Install the camshaft sprocket and timing chain.
4. Install camshaft sprocket bolts.
Be sure to align the camshaft and the crankshaft sprocket marks. Timing marks (Number 4 Firing).
Tighten bolts to 21 ft. lbs.
5. Align the keyway on the reluctor ring with the key in the crankshaft.
6. Install the reluctor ring onto the crankshaft until the ring is completely seated against the crankshaft sprocket.
7. Install the timing cover.

Don't know what Wire you are referring to.

The serial numbers on the FS130, HL90K,HT101 and BG55 would be on stickers if they are still there... The MS250 serial numbers are located on a 'flat' by the side of the exhaust and sprocket cover. (depending on the year of manafacture)

http://www.magic-parts.co.uk/acatalog/Stihl-HT-131-Pole-Pruner.php

Take it to an authorized repair center. Not what you want to hear but its better that way. It is a complicated ordeal that if you aren't trained for you can do damage to the shafts

If you need further help, I’m available over the phone at https://www.6ya.com/expert/kelly_69a0cf1b13789df1

Remove the entire cutting head from the pole and stick a screwdriver in the end and try to turn it to see what happens. if you can turn it, but the chain still won't move, obviously you have stripped gears. if you rotate the screwdriver and the mechanism performs correctly, reinstall it, and remove the shaft from the powerhead and try to turn the clutch drum with the screwdriver, as well as spin the pole shaft with some pliers. You should now be able to determine where the problem is. Once you do, post a response and I will help narrow down the issue and get you a part number(s).

Timing is not resettable by the user, as the computer controls this based on knock or no knock conditions which will advance or ****** ignition timing for optimum performance.

The valve timing is something that is set when installing the timing chain:

2.5L, 2.8L and 3.1L Engines Fig. 4: Timing chain and sprocket removal - 2.5L engine
Fig. 5: Timing chain and sprocket removal - 1996 3.1L engine shown
Fig. 6: You must use a suitable puller to remove the crankshaft sprocket

1. Disconnect the negative battery cable.
2. Remove the timing chain front cover assembly, as outlined earlier in this section.
3. Rotate the crankshaft until the timing marks on the crankshaft sprocket and camshaft sprocket locator hole are aligned to the marks on the engine block or timing chain dampener. This is the No. 1 piston at TDC (No. 4 firing position).
4. Unfasten the camshaft sprocket retaining bolt/screw, then remove the camshaft sprocket and the timing chain. NOTE: If the camshaft sprocket does not come off easily, a light blow on the lower edge of the sprocket with a rubber mallet should loosen the sprocket.
   
5. Remove the crankshaft sprocket using tool J 23444-A or equivalent puller.
6. If necessary, remove the timing chain dampener retaining bolts, then remove the dampener. To install:
   
7. Install the crankshaft sprocket using tool J 38612 until it the sprocket is fully seated on the flange of the crankshaft nose. Apply a coat of Molykote® or equivalent, to the sprocket thrust surface.
8. Hold the camshaft sprocket with the chain hanging down, and align the marks on the camshaft and crankshaft sprockets.
9. If removed, install the timing chain damper to the engine block.
10. Align the dowel in the camshaft with the dowel hole in the camshaft sprocket. Install the camshaft sprocket and chain, use the camshaft sprocket bolts to draw the sprocket on to the camshaft. Tighten the sprocket bolts to 18 ft. lbs. (25 Nm).
11. Lubricate the timing chain with engine oil.
12. Install the front cover assembly, as outlined earlier in this section.
13. Connect the negative battery cable.

Timing Chain and Gears REMOVAL & INSTALLATION 2.2L Engine Fig. 1: The timing marks on the sprockets should be in alignment. If not, turn the crankshaft until the marks are aligned
Fig. 2: The timing chain tensioner is retained by a Torx head bolt (1) and a regular hex head bolt (2)
Fig. 3: Unfasten the camshaft sprocket bolt
Fig. 4: Remove the camshaft sprocket and the timing chain at the same time . . .
Fig. 5: . . . then remove the tensioner assembly
Fig. 6: Compress the tensioner spring and insert a cotter pin or nail in the hole provided to hold the tensioner in position

1. Disconnect the negative battery cable.
2. Remove the front cover as previously detailed.
3. Place the No. 1 piston at TDC of the compression stroke so that the marks on the camshaft and crankshaft sprockets are in alignment (see illustration).
4. Loosen the timing chain tensioner nut as far as possible without actually removing it.
5. Remove the camshaft sprocket bolts and remove the sprocket and chain together. If the sprocket does not slide from the camshaft easily, a light blow with a soft mallet at the lower edge of the sprocket will dislodge it.
6. Using a suitable gear puller, remove the crankshaft sprocket. To install:
   
7. Press the crankshaft sprocket back onto the crankshaft.
8. Install the timing chain over the camshaft sprocket and then around the crankshaft sprocket. Make sure that the marks on the two sprockets are in alignment (see illustration). Lubricate the thrust surface with Molykote® or its equivalent.
9. Align the dowel in the camshaft with the dowel hole in the sprocket and then install the sprocket onto the camshaft. Use the mounting bolts to draw the sprocket onto the camshaft and then tighten to 66-68 ft. lbs. (91-95 Nm).
10. Lubricate the timing chain with clean engine oil. Tighten the chain tensioner.
11. Installation of the remaining components is in the reverse order of removal. Fig. 7: Exploded view of the timing chain and sprockets - 2.2L OHV engine