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Crankcase bolts on from bottom of fuel tank top section. As you can see it's idiot proof like most of this engine. Notice the bolt spacing. Can't be put on backwards. I used loctight on the bolts. 
Another view of the crankcase and fuel tank top section. The next step could be assembly of the fuel tank, but the base is still being cleaned. 
Crankshaft installed in crankcase. I think you could put this in backwards. The short end goes in first. I used a very light general purpose grease on the bushings. Lubrication is critical on first firing. Don't put it together dry. I prefer the light grease to oil, because I don't know how soon I will fire it up. 
Side cover/bushing housing installed on crankcase. Once again I used loctight on the bolts. Cheap insurance. Bolt spacing prevents this piece from being installed incorrectly. Notice the notch for the backing plate is on top. 

Once again, use a light assembly grease or at least a coat of oil on the bushings. 

I also rubbed a light coat of WD on the inside of the crankcase before installing cover. It's not fussy. Just get something in there to keep it from rusting before it's time to fire the engine. 

I finally got the fuel tank base cleaned and ready. I used a different method and will cover that in the future. The inside of the fuel tank doesn't have to be perfect, because nobody will see it, but I also don't want rust or corrosion to return after cleaning. I rushed this a little and got them bolted together. Once that was done, I poured motor oil in through the carb hole, and rotated this assembly to cover the interior of the tank. Should keep things nice and rust free. 
Note!! Long tank bolt holds starter cover in place later. Right side of cylinder with cylinder facing you. Not shown here. 
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