How to pick correct front derailleur replacement I just got 26 inch Huffy mountain bike at Walmart. It looks fine except front derailleur spring is too tight. I checked everything. Cable is moving fine, I checked derailleur on my similar bikes, so more or less I confident that derailleur spring is too tight. It makes it very difficult to shift it into the highest gear.
I was thinking to replace spring, but looks like whole derailleurs are not too expensive. So my question how do find correct replacement for my derailleur:  SR Sunrun 42T.
For example, would this one work: ebay.
Also given that this is new bike, should I just return it to Walmart or try another one? I am concerned that for this price there will be always something to replace even on the new bike
Update
I tried to loosen H and L screws completely. On front derailleur it is easy to see how they work and I can confirm that I set them temporarily to provide to limiting at all.
I also tried disconnecting cable and handle twists freely without any problems. So if it is routing issue, then it is probably something beyond my area of expertise, I can only check something obvious.
I would suggest you return the bike to Walmart. If the derailleur doesn't move it is not a spring that is too tight. There is something either out of adjustment or broken. The problem with buying a bike at Walmart or other department stores is the skill of the person assembling the bike varies from competent to no idea what they are doing. The bikes they sell are at the lowest possible point. They generally don't work well right out of the box. If you replace the derailleur yourself you have potentially voided the warranty for any other issues that show up.