Starter button does nothing.

this a motor bike question ?

if the starter isnt cranking the motor
will be battery wires to the starter or earth
could be faulty start button on the handle bars

if its cranking over will be a spark ir fuel issue

Every bike has same way to adjust handle bar and that is pretty easy to adjust.
Please watch movies I attached.

sounds like the wiring loom got pinched and damaged in the handle bar change

Most likley a rear drailleur issue. Try to turn the adjustment screw at the handle bar end where the derailleur cable goes into the grip. This is a fine adjustment screw for the drailleur itself. It will allow mirco adjustment of the cable to line the derailleur up perfectly so the chain stays in place

This would mean that your battery is dead and needs to be charged! hope this helps!

The side stand kill switch may be out of position, Starter button wire has come disconnected somewhere along the way? Is there power from the button to the solenoid when the button is pressed. If so, get a new solenoid. If not, trace the wire back to the button and find where it has come disconnected.

TIRE PRESSURE IS OME MAIN PROBLEM...APPLY MORE THAN WHAT IT CALLS FOR.."OVER INFLAT"..38-42 lbs

some say that the stock tires are to blame...ask around to those whom have switched to different brand /style tires
one odd therory is the exhuast pipes cause the weight shift....were the bike wants to go right if handle bars are let loose...
make sure that the forks have prper oil/pressure levels

To fold the buggy, it is necessary to operate both a primary lock, and then a secondary lock. Start by making sure that the front swivel wheel is locked. Operate the primary locking device by pulling upwards on both of the plastic tabs located on the side of the handle arm just below the foam handle grip. Begin pressing downwards so that the pushchair begins to fold. Next, release the secondary locking device (raising the bar located lower down on the left-hand side) and continuing pressing downwards on the handle bar until the pushchair is fully folded. The handle bar can then be folded inwards to the maximum, by pressing simultaneously on the adjuster buttons on either side. Finally, with the chassis laid down, lock it into its folded position by closing the folding latch operated on the side.
Operating instructions, with diagrams, may be obtained from [email protected]
I hope that this is helpful. Do leave some feedback, so that we know how you got on!

Most bikes use an allen key to adjust the height of the handle bars. Typically 6mm. But be careful most bikes do not have much adjustment that can be done to the height of the handle bars. The handle bar stem will have a line on it of the "minimum insertion". That line must be below the top of the head set nut for safety reasons. Look for the line as you adjust the height.

does the bike turn on .. like lights and all? does it role over but just wont fire? if lights and everything come on then it would be a tip over sensor. i had same prob, laid bike down going very slow... got it back up wouldnt start just rolled over if i rememeber right. turned the key of then back on and sensor had reset...... try disconnecting the battery for a few, then reconnect it and try it.