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Old 04-27-2020, 10:27 PM
  #8  
D3MON
 
Join Date: Jan 2019
Location: Western MT
Posts: 162
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is your flywheel keyed? or is it the collet type? if its the collet type really any SG type engine should fit, even something like the G3.0, (these were used on the later version of the RS4-3) or a long threaded crank engine. (short threaded wont work as there isnt enough threads to engage the pilot shaft/nut because of how thick the flywheel is.)
the main issue with the 15FE is that they are single needle carbs, unless yours was swapped out for the O.S. 10E carb.
they are pretty decent engines, but i wouldnt sink alot of money into one unless you have a reason.
engine mounts are probably going to be a pain to find, but doable.
and you are positive its not pinch that is causing the issue? i dont think i have ever heard of a sleeve/piston warping except for very extraneous circumstances, like overheating way past 300F. or mechanical failure.
if you pre-heat the engine to 200F with a heat gun, will it turn over then?