How to disassemble a 2-stroke engine?

[wizard]

Hi,

Today, I took out my TT Pro-36H engine and tried to turn it but found that the whole thing is jammed. So I removed the cylinder head, the backplate and the carburetor. Apparently, after 1 year plus of not using has caused the fuel residues in the engine to dry up and now the piston is stuck in the outward position. From what I see, the crankshaft looks ok and movable. Thinking of stripping apart the whole engine to clean it. But how do I free the piston?

[Art]

I soaked my own engine in WD40 overnight....

[wizard]

I soaked my own engine in WD40 overnight....

Finally after several hours of oiling and trying, I managed to get the piston moving. I simply hammered the piston back into the cylinder. Except for some minor scratches on the piston head, everything is ok and moving smoothly now. Took it to the field for a testing today. It fired up on the first try but it sounds a bit funny as I push up the throttle. Guess it might need some twisting on the needle.

[rifqi]

Hi,

Today, I took out my TT Pro-36H engine and tried to turn it but found that the whole thing is jammed. So I removed the cylinder head, the backplate and the carburetor. Apparently, after 1 year plus of not using has caused the fuel residues in the engine to dry up and now the piston is stuck in the outward position. From what I see, the crankshaft looks ok and movable. Thinking of stripping apart the whole engine to clean it. But how do I free the piston?

when u say outward position, do u mean the piston is at the top?

learnt something from Fit yesterday.. after every nitro flight, u have to make sure the piston is at the bottom (do it by turning the shaft) if it is at the top, after engine is cooled down, the piston might get jammed..

[wizard]

when u say outward position, do u mean the piston is at the top?

learnt something from Fit yesterday.. after every nitro flight, u have to make sure the piston is at the bottom (do it by turning the shaft) if it is at the top, after engine is cooled down, the piston might get jammed..

Is it?? Never know that. I thought that by the time the whole engine cool down, the piston will be cool down also. So, if everything went down to room temp, then the piston shouldn't have got stuck even when it is at the top postion. I remember the last time (1 yr + ago) when I tried turning the crankshaft, it will moving every smoothly.

[wtp]

Is it?? Never know that. I thought that by the time the whole engine cool down, the piston will be cool down also. So, if everything went down to room temp, then the piston shouldn't have got stuck even when it is at the top postion. I remember the last time (1 yr + ago) when I tried turning the crankshaft, it will moving every smoothly.

on the top of the cylinder is usually smaller in diameter tat where the compression comes from.unless yr is a very seasoned piston/liner (compression is not tat tight afterall) but then the pwr might be a loss there.