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Do you mean the crankshaft? ......
600 = Bore and stroke =95 mm by 84 mm
660 = Bore and stroke = 100 mm by 84 mm.. The stroke is the biggie..and they are the same!!.....BUT the rod length must to be exactly the same..
The bore doesn't matter.....rod small end ID must be the same..NOW >> .....if the crank journals are the same size...something that will have to be measured..You need a both crankshafts "in hand" to do some specific measuring.. shaft lengths,shaft o.d.'s.. threads, etc.. if they match..go for it..
blow by is cause primarly from worn rings and worn bores. The fix is to bore out the cylinders and fit over size rings. The major reason for blow by is a faulty air filter system that allows the engine to be "dusted" in use.
Most of the time it's because the Pilot/Idle jet is clogged in the carburetor. This most often happens because of old fuel sitting in the carburetor during long periods of sitting and non-use. The fuel forms a varnish - a gummy layer inside of your carburetor and clogs the tiny holes in the idle jet. Since fuel can't get through, the engine dies. The hole for the choke is larger, therefore the fuel can still get through it.