Tighten that flywheel bolt up man. Should not be coming loose when cranking by hand, it will be under alot of stress when its together. Use a quick blast with an air ratchet/impact socket if you have access to it. Otherwise youll have to use a strap wrench to hold the flywheel (if you dont have a flywheel holder) and tighten the bolt down as much as possible.
Once thats done you spin the flywheel around until you see the "T" mark on the flywheel line up in the small hole (when the smaller allen cap is removed).
Keep slack in the chain, and make sure your tensioner is removed. Its kind of a chore to get the chain lined up on the cam teeth how you need it with the bearing assemby on, so I did the following. I put the bearing race for that side off to the side and put the chain on the teeth, pulling it tight to check and make sure the lines lined up flush with the top surface of the head. Remember, the lobes should be DOWN and the vertical line on the sprocket should be UP. Then I slid the bearing onto the end of the cam and moved it into place in its groove. Some people say not to use assembly lube when doing this, but I always use red assembly lube on all the journals
You can tell its on the compression stroke easily when you have the stock cam or a cam that uses the stock decompression mechanism because you will hear it click when you turn it over on that stroke (if you put a spark plug in it) Thats because on the compression stroke when youre first starting it up it opens one of the exhaust valves a slight bit to release some compression so the starter can turn the engine over easier.
Hope this rambling response helped some, if not just ask more questions and Ill try to be more clear
-Paul
**Full TC 426cc national kit (rebuilt, back in business)**
-13:1 JE piston, national port+polish, lightened flywheel, port matched carb boot, TC 924 MX cam, TC hi rev CDI, oversize head stud kit, CRF cam chain, Carrillo HD rod, Sparks X-6 exhaust, FST auxillary oil cooler, PEP shocks, Laeger's +3 A-arms, JB Racing +1.25 swingarm, LSR axle, RPM tapered carrier, blue Maier plastic, Quadtech hood, Nacs graphics, seat cover, case saver, bar clamps etc, Renthal CR-Hi bend bars, Arens stem, Pro Design Pro Flow kit w/K&N, Outerwears airbox, snorkel hole + filter covers, RAD locknut, PEP E-Z pull clutch lever, Steel Braided brake lines, Razr MX tires, Douglas rims, Pro Armor nerfs, AC bumper, Rath seat latch, Motion Pro cables, WB e-brake block off, DID X-ring chain, Sidewinder sprockets, probably some more Im forgetting...
R.I.P Kelly Chang