Anything can be fitted to anything else, if your engineering skills are good enough. But unless you can do welding I don't recommend that you even try - it's not like it will bolt straight on. On top of that there's the issue with the drive train. Mopeds and scooters all have gear boxes to adapt what the engine puts out to something that the vehicle can use. Most lawn mower engines won't have that.
Well first off, a lawn mower is probably not the best choice. The cheapest way to attach it to the axle is to turn it on its side. (the jack shaft is usually vertical.)This is not very effective though. It is likely to cause piston seizure, and gas injection fail. Try going to a scrapyard and finding a ATV. You can salvage the engine, wheels, shocks, and sprockets off of it. The engine will probably range from 20hp to 50hp. If you think that is to big of an engine, Try going to a small engine repair shop. You might be able to get a used 5-10hp engine for cheeper than normal.
Yes
You are going to use it in a lawnmoer to race they are i think about 15 hp but if u want a fast lawnmower use a snowmobile engine
NO, not as lubrication in the crankcase.
I think it is a 2.5 horsepower engine. There are 4 oil formulas for Kawasaki lawnmower engines. I recommend you use the correct blend as stated in your owner's manual.
No it is far too heave for an air cooled engine i recommend 10W 30 or just a regular 4 stroke lawnmower oil
Generally, 30W of SG or higher rating.
Craftsman lawnmower parts could easily be found on ebay or kijijii. You could also check out the manufacturer's website as well, as they may have some special deals or coupons you could use.
Depends on which engine but most use SAE 10w30 weight. I recommend you use 100% synthetic oil in an air cooled engine.
Then you will destroy a perfectly good engine in a very short amount of time. Use SAE 10w30 full synthetic oil in your air cooled lawnmower engine and it will provide years of service. Change the oil once each year when you store the mower for the winter.
Sure you can but put a lot of pipe on it because if not you could burn up your exhaust valve in the engine. You need a little back pressure and that's what the extra pipe should be used for.
Most manufactures recommend SAE 10W30 or 30W. I recommend you use 10W30 Synthetic in any air cooled small engine.
SAE 30 non-detergent is recommended by most engine manufacturers but you can use synthetic 5w-30 for winter use.