I’ve always used Picco based motors that are known to have an extremely tight pinch. I’m on my 5th tank heat cycling. I took the engine apart, and everything looks spotless but I have one concern. I can actually turn the crankshaft full rotation by hand already on the GRP? Don’t get me wrong, it still has solid compression but compared to my JPX .21 that has about 2 gallons on it and I still can’t turn it over by hand. 5 tanks ago, when I installed the flywheel on the GRP I couldn’t crank it over by hand, but now I can.
My question is to those of you who have used anything other then Picco based engines. Does the pinch become considerably less in under a ½ gallon? If this is normal I will feel a lot better. Like I said I have had two JPX.21’s and they have been extremely tight even after a couple gallons