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If someone is having trouble backing up a trailer tell them to hold their hand on the bottom of the steering wheel, and when they want the trailer to go right move their hand right. That trick minimizes most of the chaos.

As for your hesitation, have you tried to decarb it? I assume the engine is new to you and has been sitting. If you don't know what I am talking about I can post the procedure. It is simple to do and you won't believe the goo that comes out of the engine.

The above will help your engine be all it can be but when you say you have a kinked fuel line all sorts of red flags come up. You wouldn't believe how many problems are caused by on deck fuel tank lines. You could have bad hose, leaky connections or the famous bad primer bulb. I wouldn't just be replacing the kinked hose, I'd be replacing the entire fuel line assembly with quality OEM gear, and replace any connection fitting that looked iffy.

Oh, have you put new plugs in it yet? And a dirty fuel filter can cause hesitation, but I'm sure you checked that.