Get a bit of wood that will fit down the barrel ontop of the piston and give it a few lumps wirh a hammer to see if you can rotate the crank and get the piston lower down the barrel.

Im thinking that the dowels that locate the barrel onto the bottom end have rusted and jammed them together.

They have ive definatly got to replace barrel as got a but heavy handed and broke 4 of the fins so gonna get a good set of mole grips and try and unsrew the rusted bolt of at least turn it a little to break the rust

heat the studs till they glow, that will move them. let cool then try it

Will do mate gotta buy a new can of gas for ma blowtorch its not the best but It does the job lol ill try that as soon as I get one also building a rs125 from frame up for ma mate lol and im rebuilding a littlw zd50py lol to many bikes on the go lol

best to use MAPP gas

Ah, I built a DT50MX from the frame up in a weekend, depending how brutal you want to be, a wedge between the cooling fins may loosen it or just break the fins, either way of you aren't using the head again it doesn't matter

Sorry havnt been on in a couple of days found out previous owner had bogde jobbed the exhaust by welding a nut to the exhaust right next to the stud which seems to of damaged the stud got it off ended up pulling it out of the thread in engine before it loosed the cylinder lol sorted now tho 70 kit fitted just waiting for a day to reasemble my bike now

the dreaded weld I was talking about

Whats left of the old cylinder

The old piston this would do 35 (indicated) with this piston how is that possible ?

Ta darrr finally nakaru 70cc kit fitted new gaskets and a heavy duty top end bearing now to re assemble the ped of death lol [emoji12]

good its sorted, if you knew it was welded and bit of angle grinding would have done that in 2 mins.

typical eh!

Thought it was sorted but now gotta take it to a garage to get engine helicoiled due to the rough extraction of the cylinder [emoji31]

Tryed to start and losing a lot of compression from the cyliner bolt by the exhaust due to thread is stripped

don't tighten up just 3 of the bolts, you'll warp the head

Helicoil kits are around £5-10 bud, I've got a couple over here which have saved my bacon a few times, give it a shot!

Ive been qouted 25 to helicoil it from a local garage im gonna let them do it at least if they mess it up I got someone to blame other than my self lol might grab a kit and have a practice tho for of I need it doing later down line on another project

Finally after a long week of waiting its done lol just got to put frankestein back together lol

Frankenstein was the doctor, not the monster

Common mistake lpl

Oh lol thanks I thought that after I posted just wasnt to sure lol all together now and seems to want to pull off like a rocket as soon as I even dab the accelerator I must say I am very please with the nakura 70cc bore kit touch wood not a problen yet lol

If it's feeling a bit lively better check your mixture, if it's running lean it will overheat or even blow a hole in the piston