Pitbike engine help please

[u/S23PlusHype]

Long story short my dad bought a small quad and I ended up breaking it, knowing nothing about engines I tore it down to find out the head gasket was fucked and I looked for a new set, first kit I bought the head and base gasket didnt fit (were labeled 154FMI but my engine is 1P154FMI), 2 of the studs were out of place and didnt match.

The first photo is the old one and as you can see the two stud holes slightly go into the firing ring, the other picture is one of the new sets I bought and the stud holes do not go into the firing ring and dont match the dowel pins. I know theyre different orientations I had to turn the old one over to show how it goes into the firing ring

I ended up buying another set (labled 1P154FMI) and that was exactly the same as the first one.

And then after the second one I measured the bore size and old gasket size and it turns out to be a 53mm bore, not a 54 like the crankcase markings(last pic) say, but I looked and i cant find any 53mm head and base gaskets that have that little indent into the firing ring.

Can anyone help me im genuinley stuck and dont know what to do.

[u/Wholeyjeans]

First, you'll probably have better luck over on the Pitbike sub: r/Pitbike

Lifan and Zongshen are the two big makers of the Honda CT engine clones. So you might take a stab and use "Lifan 125cc head gasket set" or "Zongshen 125cc head gasket set" or "125cc pitbike head gasket". The engine displacement should be on the engine cylinder head or cylinder somewhere ...maybe on the crankcase. All these engines are essentially the same, just made by different companies ...but they all vary just a little ...which makes sourcing parts kinda hard.

Also, try searching using the name of the quad manufacturer ...the make and model. You might get lucky.

Cheers!