Ready to install starter motor but chain has to much play.To stay

double posted but this time the CAM pops up.
why not read the FSM first. ? linked below.
or alldata.com . log in and read.

here ill do a paste from JUST install PART chapter.
you are doing ALL THAT book free, REALLY?
https://www.techauthority.com/en-US/Pages/Home.aspx

1. Using a vise, lightly compress the secondary chain tensioner piston until the piston step is flush with the tensioner body. Using a pin or suitable tool, release ratchet pawl by pulling pawl back against spring force through access hole on side of tensioner.
2. While continuing to hold pawl back, Push ratchet device to approximately 2 mm from the tensioner body. Install Special Tool 8514 lock pin into hole on front of tensioner. Slowly open vise to transfer piston spring force to lock pin.
3. Position primary chain tensioner over oil pump and insert bolts into lower two holes on tensioner bracket. Tighten bolts to 250 inch lbs. (28 Nm).
4. Install right side chain tensioner arm. Install Torx®bolt. Tighten Torx®bolt to 250 inch lbs. (28 Nm). CAUTION The silver bolts retain the guides to the cylinder heads and the black bolts retain the guides to the engine block.
5. Install the left side chain guide. Tighten the bolts to 250 inch lbs. (28 Nm).
6. Install left side chain tensioner arm, and Torx®bolt. Tighten Torx®bolt to 250 inch lbs. (28 Nm).
7. Install the right side chain guide. Tighten the bolts to 250 inch lbs. (28 Nm).
8. Install both secondary chains onto the idler sprocket. Align two plated links on the secondary chains to be visible through the two lower openings on the idler sprocket (4 o'clock and 8 o'clock). Once the secondary timing chains are installed, position special tool 8429 to hold chains in place for installation.
9. Align primary chain double plated links with the timing mark at 12 o'clock on the idler sprocket.
10. Align the primary chain single plated link with the timing mark at 6 o'clock on the crankshaft sprocket.
11. Lubricate idler shaft and bushings with clean engine oil. NOTE The idler sprocket must be timed to the counterbalance shaft drive gear before the idler sprocket is fully seated.
12. Install all chains, crankshaft sprocket, and idler sprocket as an assembly . After guiding both secondary chains through the block and cylinder head openings, affix chains with a elastic strap or equivalent. This will maintain tension on chains to aid in installation. Align the timing mark on the idler sprocket gear to the timing mark on the counterbalance shaft drive gear, then seat idler sprocket fully . Before installing idler sprocket bolt, lubricate washer with oil, and tighten idler sprocket assembly retaining bolt to 25 ft. lbs. (34 Nm). NOTE It will be necessary to slightly rotate camshafts for sprocket installation.
13. Align left camshaft sprocket "L" dot to plated link on chain.
14. Align right camshaft sprocket "R" dot to plated link on chain. CAUTION Remove excess oil from the camshaft sprocket bolt. Failure to do so can result in over torque of bolt resulting in bolt failure.
15. Remove Special Tool 8429, then attach both sprockets to camshafts. Remove excess oil from bolts, then Install sprocket bolts, but do not tighten at this time.
16. Verify that all plated links are aligned with the marks on all sprockets and the "V6" marks on camshaft sprockets are at the 12 o'clock position. CAUTION Ensure the plate between the left secondary chain tensioner and block is correctly installed.
17. Install both secondary chain tensioners. Tighten bolts to 250 inch lbs. (28 Nm). NOTE Left and right secondary chain tensioners are not common.
18. Remove all locking pins from tensioners. CAUTION After pulling locking pins out of each tensioner, DO NOT manually extend the tensioner(s) ratchet. Doing so will over tension the chains, resulting in noise and/or high timing chain loads.
19. Using Special Tool 6958, Spanner with Adaptor Pins 8346, tighten left and right . camshaft sprocket bolts to 90 ft. lbs. (122 Nm).
20. Rotate engine two full revolutions. Verify timing marks are at the follow locations: ² primary chain idler sprocket dot is at 12 o'clock ² primary chain crankshaft sprocket dot is at 6 o'clock ² secondary chain camshaft sprockets "V6" marks are at 12 o'clock ² counter balancer shaft drive gear dot is aligned to the idler sprocket gear dot.
21. Lubricate all three chains with engine oil.
22. After installing all chains, it is recommended that the idler gear end play be checked. The end play must be within mm 0.004-0.010 inches (0.10-0.25). If not within specification, the idler gear must be replaced.
23. Install timing chain cover and crankshaft damper.
24. Install cylinder head covers. NOTE Before installing threaded plug in right cylinder head, the plug must be coated with sealant to prevent leaks.
25. Coat the large threaded access plug with Mopar® Thread Sealant with Teflon, then install into the right cylinder head and tighten to 60 ft. lbs. (81 Nm).
26. Install the oil fill housing.
27. Install access plug in left cylinder head.
28. Install power steering pump.
29. Fill cooling system.
30. Connect negative cable to battery.

With primary chain loose, there will be a LITTLE back and forth play on the compensating sprocket.

I believe on the 2007 V Star that you have to remove the side cover on the left side of the engine to replace the starter. It has a sprocket the slides onto the starter shaft. If you just unbolt and remove the started the sprocket falls out of place and when you install the new starter the sprocket that turns the motor over does not go back onto the starter shaft. Remove left engine side cover and install sprocket wth chain back onto the starter shaft. Should fix your problem.

Remove camshaft covrs
Remove front cover
Remove or fully retract all three timing chain tensioners
Remove oil pump
Primary and secondary chain guides should remain in place. Rotate crankshaft until sprocket drive key is at about 1 o'clock position.
Set crankshaft and intermediate shaft sprockets into primary drive chain with their timing marks asjacent to each other.
Install crankshaft and intermediate sprockets over their respective shafts. Rotating crankshaft as necessary to engage crankshaft key in sprocket without changing the timing mark relationship.
Install Flywheel Holder Tool (J-39411) to lock crankshaft in position. Install intermediate shaft sprocket retaining bolt and torque to specifications.
Route secondary chain for left cylinder head over inner row of intermediate shaft teeth.
Route secondary drive chain over chain guide, and install exhaust cam sprocket to chain so camshaft drive pin engages the sprocket notch marked "LE" (Left Exhaust).
There dhould be no slack in the lower section of the chain, and the camshaft drive pin must be perpendicular (90 degrees) to the cylinder head surface.
Install the intake camshaft sprocket into the chain so the sprocket notch marked "LI" (Left Intake) engages camshaft drive pin, while drive pin remains perpendicular to the head face. Minor adjustments can be made to camshaft position to get pin to engage by using a wrench on the hex cast into the camshaft.
Install sprocket retainer bolts and torque to specification.
Repet steps as above to install the right secondary chain to the right camshafts. The right camshaft sprockets are marked "RE" and "RI". In addition, the RE sprocket must contain the camshaft position sensor pickup.

This should be everything you need....

1. Remove the fan and generator V belt:



2. TIMING CHAIN (2az-FE Engine):
Before servicing the vehicle, refer to the Precautions Section.
Drain the engine oil.
Remove or disconnect the following:
Negative battery cable
Hood Right-side front wheel Engine under covers Right-side fender apron seal Front exhaust pipe Engine moving control rod and bracket Right-side engine mounting stay and bracket Accessory drive belt Engine appearance cover Engine wire Alternator Power steering pump, leave the hoses connected Ignition coils Ventilation hoses Cylinder head cover Turn the crankshaft pulley to set the No. 1 cylinder to TDC compression. Align the groove on the pulley with the timing mark -0- on the front cover. Remove the crankshaft pulley as follows:

1. TMC made: Use Special Tool 09213-54015 to hold the pulley to loosen the bolt. Use Special Tool 09950-50013 to remove the bolt and pulley.

2. TMMK made: Use Special Tool 09960-10010 to hold the pulley to remove the bolt. Use Special Tool 09950-40011 to remove the crankshaft pulley


Fig. Removing the crankshaft pulley-TMC-2.4L (2AZ-FE) engine


Fig. Removing the crankshaft pulley-TMMK-2.4L (2AZ-FE) engine


Remove or disconnect the following:
Crankshaft position sensor Lower oil pan No. 1 chain tensioner Accessory drive belt tensioner

Support the engine with a suitable engine lifting device.

Remove or disconnect the following:
Engine mounting insulators Right-side engine mounting bracket Stud bolt for the accessory drive belt tensioner from the block Front cover mounting bolts and nuts Front cover Crankshaft position sensor plate Timing chain tensioner slipper Timing chain vibration damper Timing chain Crankshaft timing sprocket

• Turn the crankshaft counterclockwise by 90°, and align an adjusting hole of the oil pump driven sprocket with the groove of the oil pump.

Fig. Align the adjusting hole of the oil pump drive sprocket with the oil pump groove-2.4L (2AZ-FE) engine


Fig. Insert a bar to lock the sprocket in position-2.4L (2AZ-FE) engine
Put a bar in the adjusting hole of the oil pump driven sprocket to temporarily lock the sprocket in position. Remove the nut.


Remove the bolt, chain tensioner and spring.


Remove the chain tensioner, oil pump sprocket and No. 2 timing chain.


To install:
Set the crankshaft key into the left horizontal position. Turn the cutout of the drive shaft to the top

Fig. Align the crankshaft key and drive shaft cutout as shown for installation-2.4L (2AZ-FE) engine
Align the yellow colored links with the timing marks of the sprocket as shown in the illustration.

Insert the sprockets with chain to the crankshaft and oil pump shaft.

Temporarily tighten the oil pump driven sprocket with the nut.

Insert the damper spring into the adjusting hole, and install the chain tensioner plate with the nut. Tighten to 9 ft. lbs. (12 Nm).

Align the adjusting hole of the oil pump driven sprocket with the groove of the oil pump.

Put a bar in the adjusting hole of the oil pump driven sprocket to temporarily lock the sprocket in position. Tighten the nut to 22 ft. lbs. (30 Nm).

Rotate the crankshaft counterclockwise by 90°, and align the crankshaft key to the top.

Install the timing chain vibration damper. Tighten to 80 inch lbs. (9 Nm).

Align the timing marks of the camshaft timing sprockets and bearing caps.

Using the crankshaft pulley bolt, turn the crankshaft and set the set key on the crankshaft upward.

Align the gold or orange colored link with the timing mark of the crankshaft timing sprocket.

Using Special Tool 09309-37010, tap in the sprocket.

Align the gold or yellow colored links with the timing marks of the camshaft timing gear and camshaft timing sprocket. Install the chain.

Fig. Align the marks of the sprockets and bearing caps to set the No. 1 cylinder at TDC-2.4L (2AZ-FE) engine

Fig. Set the crankshaft set key facing upward-2.4L (2AZ-FE) engine

Fig. Align the marked link of the timing chain with crankshaft sprocket timing mark-2.4L (2AZ-FE) engine

Fig. Tap the crankshaft sprocket in with Special Tool 09309-37010-2.4L (2AZ-FE) engine


Fig. Align the marked links of the timing chain with the camshaft sprockets during installation-2.4L (2AZ-FE) engine

Installation
Install crankshaft sprocket on crankshaft.
Make sure mating marks on crankshaft sprocket face front of engine.

Position crankshaft so that No. 1 piston is at TDC and crankshaft key is at 12 o'clock.

Install slack side timing chain guide and timing chain tension guide.

Install timing chain on crankshaft sprocket.
Set timing chain by aligning its mating mark with that on the crankshaft sprocket.
Make sure sprocket's mating mark faces engine front.

Install camshaft sprockets.
Set timing chain by aligning mating marks with those of camshaft sprockets.

Install camshaft sprocket bolts to correct torque.
Apply new engine oil to bolt threads and seat surface.

Install chain tensioner.
Before installing chain tensioner, insert a suitable pin into pin hole of chain tensioner.
After installing chain tensioner, remove the pin.
Install timing chain guide.

Install O-rings to cylinder block.

Before installing front cover, remove all traces of RTV silicone sealant from mating surface using a scraper.
Also remove traces of RTV silicone sealant from mating surface of cylinder block.

Apply a continuous bead of Genuine RTV Silicone Sealant or equivalent to mating surface of front cover. Refer to RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS .
Check alignment of mating marks on chain and crankshaft sprocket.
Align oil drive spacer with oil pump.
Place timing chain to the side of chain guide. This prevents the chain from making contact with water seal area of front cover.

Install front cover.

Make sure two O-rings are present.

Be careful not to damage oil seal when installing front cover.
Install cylinder head bolts at engine front side as shown in Fig. 55.
Tightening procedure:
Tighten bolts (1 - 4): 6.3-8.3 N.m (0.64-0.85 kg.m, 55.8-73.5 in.lb).

Install oil pump drive spacer.
Install water pump and water pump pulley. Refer to REMOVAL AND INSTALLATION .
Install idler pulley and bracket.

Install RH engine mounting bracket

Install RH engine mounting.
Install oil pan. Refer to INSTALLATION.
Install crankshaft pulley.
Remove ring gear stopper.
Install starter motor.
Install cylinder head front cover.
Apply RTV silicone sealant to cylinder head front cover.
Use Genuine RTV Silicone Sealant or equivalent. Refer to RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS .

Install Camshaft Position Sensor (PHASE).

Before installing rocker cover, apply a bead of Genuine RTV Silicone Sealant or equivalent, to mating surface of cylinder head as shown in .

Install rocker cover gasket into rocker cover.
Install rocker cover and tighten in numerical order as shown in
Install spark plugs.
Install ignition coils.
Install front exhaust tube.
Install front/right-side splash undercover.
Install front RH wheel.
Install drive belts.
Adjusting drive belt deflection..

3.4L Engine Fig. 7: View of the timing chain and related components with the front cover removed — 3.4L engine
Fig. 8: Retract the timing chain tensioner
Fig. 9: The special tools must be used . . .
Fig. 10: . . . to remove the timing chain, crankshaft sprocket and intermediate shaft sprocket
Fig. 11: Slide the sprocket and chain on the shafts, maintaining the proper alignment
Fig. 12: The crankshaft sprocket must be pressed on to specifications using a special tool

1. Disconnect the negative battery cable.
2. Raise and safely support the vehicle.
3. For 1991 vehicles, perform the following:
   1. Remove the starter motor and flywheel cover.
   2. Remove oil pan retaining nuts and bolts. Remove lower frame and powertrain onto transmission table.
4. Remove the front cover, as outlined earlier this section.
5. Matchmark the intermediate sprocket, chain link, front face of cylinder and crank sprocket for reference.
6. Retract the timing chain tensioner shoe by using J–33875 or equivalent, on both sides of the tensioner and pulling on the thru pin in the tensioner arm to retract the spring. While spring is retracted, insert a holding tool to hold it.
7. Remove the timing chain tensioner retaining bolts.
8. Raise and safely support the vehicle.
9. Remove the timing chain, crankshaft sprocket and intermediate sprocket using tools J 8433 and J 28611, as shown in the accompanying figure. If the intermediate gear does not slide off easily with the timing chain assembly, rotate the crankshaft back and forth to loosen the tight fit.
10. If necessary, remove the timing chain tensioner. To install:
    
11. Check to ensure that crankshaft key is installed and fully seated and the chain tensioner is fully installed and blade retracted.
12. Slip both sprockets and chain over the proper shaft and engage the slot in the key. The intermediate shaft may move against the rear cover. Slide the sprocket and chain on the shafts, maintaining the proper alignment shown in the accompanying figure. While installing note the following:
    1. Make sure the rubber and tension blade of the tensioner does not become caught, misaligned, or dislodged.
    2. The large chamfer and counterbore of the crankshaft sprocket are installed towards the crankshaft. The intermediate sprocket spline sockets are installed away from the case.
    3. The crankshaft sprocket must be pressed on for the final 0.31 in. (8mm) to the seated position using tool J38612 or equivalent, as shown in the accompanying figure.
    4. Check to make sure timing was maintained. Remove the retaining pin from tensioner.
13. For 1991 vehicles, install the oil pan retaining nuts and bolts, and the flywheel cover and starter.
14. Install the front cover, as outlined earlier in this section.
15. Connect the negative battery cable. Start the engine and check for leaks.

Is there some form of tensioner for the chain or do you believe it's the drive sprocket?Gas chainsaws have a bolt you can tighten which takes up the play in the chain.The drive sprocket is either on a key-way or clutch.I would remove the chain and check the drive sprocket.There must be a clutch to allow the motor to free spin until a given RPM would drive the chain.That clutch is suspect.You didn't give any information(make or model of chainsaw)that I could use to search for an answer for you.Try to work on that clutch,re-post if you need more help.