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https://www.ebay.com/itm/Redcat-Racing-BS801-002-SH-21-Engine-w-threaded-crankshaft-EARTHQUAKE-3-5/333872101662?epid=2255292152&hash=item4dbc53f91e:g:DDUAAOSwFBxgE1Lg here is the SH21 with threaded crankshaft, dont know if that helps or not. pretty inexpensive at $140, and being SH is known to...

no will not work, the threads are different between them, pilot shaft threads are typically smaller and more threads per inch, clutch nut for an SG has bigger threads and more coarse. i do think that one of teh versions of the SH21 has a threaded crank though if that is the case. for not...

to better give recommendations, will help to see pictures without the flywheel on it, typically big blocks used SG style crankshafts, but some older ones especially ones for kyosho used a threaded crankshaft with a pilot shaft. another thing that would help to determine is the mounts, i know on...