i just f..k uped

[thebatman]

I always put the piston on the crank 1st, THEN install the jug... To Me, It was to hard to try the other way...

[LoveMyKymco]

Same it just feels like you can twist the piston easier when its in the jug already, dunno Im gonna try it next time just to remember why I dont do it lol.

[Peters]

Doesn't matter. It is easier to put the piston on the crank first. Then just slide the cylinder over the piston. Make sure the ring gaps are aligned on the locators first.

There is a right way and a wrong way to install the rings. Upside down is no good. No oil ring on 2 strokes.

[Raindrop]

Whats thin ring for two big ones one thin.  it seems wierd to put ring on top of ring

Link to kit i got.  should have went with corsa


http://www.ebay.com/itm/80cc-BIG-BORE-KIT-CYLINDER-for-KYMCO-ZX50-ZX-50-Fever-50-DJ-50-48mm-/400336148356?pt=Other_Vehicle_Parts&hash=item5d35e4d784&vxp=mtr

[Peters]

Have you actually received the kit yet?

That is just a generic picture. That thin one looks like an oil ring. 2 strokes have no oil ring.

[Raindrop]

Yes i have. Its there.  and old piston on 50cc head had one to.  so i assumed needed to go on. ?
f***ed up thing is other kits dont have that thin ring. 

[Peters]

Just looked at that pic again... I have no idea what that is. I retract my previous statement. Doesn't really look like an oil ring.

[Peters]

Doesn't come with any directions?

[Raindrop]

See http://www.ebay.com/itm/POLINI-72cc-BIG-BORE-ELITE-DIO-SA50-SR50-SK50-SYM-DD50-JOLIE-KYMCO-ZX-EZ-POWER-/260966987888?pt=Race_Car_Parts&hash=item3cc2d83870&vxp=mtr

[Raindrop]

No directions.   

But if u go on you tube and look up sym bore kit this dude puts one on.  i have no clue what the hell it does
Looks like a spacer but bottom slot on piston is same as top.  or grove should i say

[Peters]

Looks funny. It's not round but like a polygon shape.

[Raindrop]

Dude on video says oil skrit ring. ?

[Raindrop]

Another question no arrow on piston to point to what side.  but there are to holes on piston does that face exhaust side cause intake is on the side on moped.  so does it face to rear tire or handle bars is the question?

[Peters]

Well damn... Check out this OEM diagram. It shows that same funny ring bellow the bottom ring.
http://www.stadiumyamaha.com/pages/OemParts?aribrand=YAM#/Kymco_USA/SC10AS_ZX50/Crankshaft_%26_Piston/2K01120005/01120021

Sure wish Zombie was around he'd tell you exactly what you need to know

Diagram doesn't really help you orientate the piston does it. Sorry I can't help more, I've never torn apart my ZX. I want to say the ring gaps go away from the exhaust port. Don't quote me on that though. I've only put a BBK on my People, not my ZX. Best thing I can tell you to do is search the forum. Look for zombie's posts. He's very knowledgeable, especially when it comes to the ZX.

[LoveMyKymco]

The crinkled ring is to put under the bottom ring, I guess it helps it seat better.
What ever side of the piston doesnt have the cut out for the boost port is the side you put towards exhaust. generally there is a half moon cut area on the piston skirt for the boost port, which is opposite of the exhaust port.