Kick start is stuck will not budge is the piston stuck, is it an easy fix?

Not a very clear question so I will try to help... It sounds like you replaced your piston and rings. Now if I understand the engine will not kick over because the kick start lever is stuck at the top position OR it is stuck in the bottom of the kick? If at the top;

Remove the spark plug so you will not have to deal with the compression confusing the issue.

First, with bike in neutral does the engine turn over easily when you put a socket onto the bolt at the end of the crank shaft?

If the crankshaft turns over easily then there is a problem in the transmission. If not then;
- Your piston is stuck because it is to big or rings were not installed correctly. Ring gap may be an issue, or you may not have used assembly lube on the wrist pin etc. etc. If the engine does not spin easily R&R the piston. There can also be something like a socket or old part that fell into the crankcase at some point.

I suppose that the clutches may be sticking to the pressure plates if the bike was apart for a period of time too. R&R the clutch pack to inspect. Before you remove the clutch pack it may be a reasonable idea to loosen the bolts that apply pressure to the clutch springs to see if that loosens the plates.

If you do remove the clutch pack make sure the bike is in neutral so you can grab the output shaft and spin it by hand. It should be easy to spin the transmission once the clutch is removed. Since you would need to R&R the clutch to split the case it is a good idea to check that it is not a problem in the transmission.

If it does turn easily then put the bike on a center stand so the rear wheel is off the ground. Put it in first gear and try again... If the crankshaft will not spin via end bolt then something is in the bottom end or transmission.

If the engine spins via crankshaft end bolt then the kick start lever has a problem and splitting the crankcase is the next step. Comment below with any new info and I will try to get back to you.

this happened with my sons pw50 where the piston ring had snapped and when it locked it was stuck bewteen the piston & bore

i would seek a shop or mechaninc to look at the top end and isnpect the piston & rings for wear or damage

dont keep kicking as this could result in further damage

This maybe a transmission or engine locked up.

Jesse,
The engine is seized up, that tinkling sound was it seizing up getting to hot probably not enough oil either two stroke or engine reservoir or it was rusted up in side u shud of taken out plug and pored in some redex oil and leave 4 ....24 hrs then kick it over with rag over to catch oil then put plug back in and start it would of smoked a couple minni'ts but would of been ok, Now u will have to take of head and see what damage u have done u mite be able to take out piston u will need to pull of barrel but first pour some oil mixed with petrol to hepl loosen of stuck piston , good luck
..

Open the bleeder valve

On Rear Calipers-- screw in the piston,
as well as push them in by hand on the rear

Piston rings could have snapped and is making it hard to move piston in barrel I wouldn't recommend using bike till you check piston out as you could damage header of engine and may need it replacing if you damage it too much.

use a C clamp and slowly force the piston[s] back take it easy and slow. you should not have to applie more than a little turning force to get it compressed if alot of twisting wont budge the piston then it is stuck in the bore or cocked to one side. center c clamp in center of the piston to prevent it getting cocked

these bikes are the hardest bikes to fix, easiest thing, kick the bike super slow until you piston is at TDC, you will know because it will be hard to kick, then pull the compression release down and as you start to kick release the compression release. NOT an easy task starting a 426 but good luck

the wheel is just stuck, try kicking the tire by putting your back to the vehicle and flat foot kicking the tire.with the bottom of your shoe.

if the kick starter is stuck that means the piston is probably stuck. Locked up the bike, pull the head off and look at the cyl.