I think I found the problem. This is not exactly the same engine when I was running Poulan the first time. I tested gasoline with glow plug on my Poulan 25 with magneto still attached. This one is cut to run without magneto. I remember I also lowered the cylinder a little for greater compression (now I understand why my started can't work it out). Like AV8TOR wrote, methanol solves he problem with "overcompressed" engines. So alternative solution would be cutting some spacer for the cylinder to bring the compression back to the original range.