I bought a GMS .47 to replace the old OS .40 my dad got for me with my trainer; My old engine was used so I never had to break it in. I decided to go ahead and break in my new GMS today which was probably a bad idea but it was too tempting and I just couldn’t leave the engine in the box. Here's what I did. I ran the first tank at full throttle really rich then leaned it out and ran it at different speeds with the second tank. It seemed to run alright but now when I turn it over and it reaches tdc it kinda sounds like the crankshaft is binding with something. I duno if this is normal and it just takes a while to get everything broken in, or I did something wrong and screwed it up. If anyone could offer me any advice it would be appreciated,, thanks