Need to find a new seat/replacement post for 24" Next PX 4.0 Boys Mountain Bike, Black

Sorry, this question doesn't make sense. Are you trying to remove the spring or are you trying to adjust it?

I don't know the name of the part, and it's going to be very difficult to ID the part over the Internet. That is a bike that sells for under $100, and therefore unusual OEM parts would be very hard to find. Take to a bike shop to see if they can suggest a fix.
NOTE: The bikes are distributed by Dynacraft, which has been the subject of suits and settlements due to serious fork and frame problems. Dynacraft BSC Inc

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

Hi Mitchell:
I looked at some pix of this bike and they showed a shifter. As long as the springs on the shifter mechanism are moving it as intended, the chain tension should be fine.
It's a good idea to occasionally clean the gear change assemble with a spray solvent, wipe it down, and then lightly oil it.

Price and value of a bike are based on more than a serial number. The main variable is condition but color, tires, number of gears and type of seat are also considerations. Look on ebay for a Haro mountain bike, chances are there is a bike like your listed for sale.

I found complete directions on-line. Just do a Google search for Bike derailleur adjustment. You should be able to find something.

The only way to do this is to get new stem with the bigger angle degree. If not sure, get the adjustable stem.

brake pads are most likely dried up. you need soft rubber for brake pads

hi, the seats are a standard size if you go into any bike shop and tell them its a girls mountain bike they will then give you the correct seat, or if you want it measured all you need to do is measure how big the hole is across so look at the hole and measure it across the middle and that will be the size, but if you just ask them for a standard sized mountain bke seat they will then give you the correct one.

let me know if you need further assistance

plz rate this solution as i have a whole page of unrated posts, thanks

Visit a bike shop or a sporting goods store in your home town.

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