Ran fine after having new impeller and low end oil.,new [lugs Then it sat for 10 months. Now its very hard to pull and not wanting to fire at all. Any advice appreciated. Thx

First thing you should do is with the small motors, when you get back on the trailer, unhook the fuel connector from the motor while it's still running. Let it run till it dies, basically run out of gas, don't choke it or anything; just idle till it runs out of gas... This way that fuel doesn't stay in the carbs while it sits.

Not sure if you did that or not. You leave the fuel hose hooked up to them, well there is all sorts of things going to take place over those 10 months, none of those things good either.

I would first make sure to unhook the fuel line from the motor then take the plugs out and pull the rope several times to help clear any residue of the fuel/oil mix out of the combustion chambers. Depending on the environment your motor sit in, like how hot, if the fuel was ran out of the motor or not, but carbs may have trouble you have to fix. It's really hard to say.
I have seen some of these motors have the fuel left attached to it and heat from the day time Temps just wreck the needle and seat in the carbs and literally puke fuel into the combustion chambers and basically lock the motor down with the gas/oil mix. Reason to pull the plugs out and pull the rope to try and clear that out to start with.

You have some things there your going to need to figure out for sure. Wish there was more I could do from here, but there is just so much to figure out just yet. I do hope this might help a little anyway. I will say one thing though, those motors are tuff, you may need some small parts like new carb kits and plugs again, but it can be made to run again