Hi guys, quick question. I ended up taking off my cylinder and cylinder head to my puch maxi to displace some water that got stuck in there from cleaning, and I for the first time got to see my piston and rings I believe (not mechanically inclined). Anyways, I thought If I pedaled my moped, that the piston would move back and forth, but it didn't, it just sat there, but I could pedal my moped forward and backward just fine. Is that normal? I thought if you pedal forward that your piston moves, even if your moped is off.
And I also thought when people say their engine won't turn over, that they just couldn't pedal their moped forward, because their piston was stuck. But in this case, I can pedal forward, and my piston doesn't move. I was able to move it by hand (I grabbed it and moved it in and out, didn't seem too hard physically).
Anyways, why won't my piston move when I pedal forward with the moped off?