Idle issues
- Thread starter enzo3856
- Start date
This site may earn a commission from merchant affiliate
links, including eBay, Amazon, and others.
links, including eBay, Amazon, and others.
- Messages
- 3,624
- Location
- Queens
Just run it easy for a little and that’s it
- Messages
- 528
- Location
- Niagara Region, Ontario
My buddy bought a used 5t and the piston looks identical, the freaking thing runs like a champ though!
- Messages
- 3,624
- Location
- Queens
I also have a question imma just toss in ur thread, how do you get the head back on, I find it very difficult
- Messages
- 7,044
- Location
- Nj
@RcJunkie13 you squeeze the piston ring with your fingers and gently push the cylinder on while going around the piston ring with your fingers to find spots that haven't compressed
Seems like low quality pistons with those casting marks on them like that new. Zenoah pistons have machine marks on the tops
MonsterAir
Lone Racer 🤠
- Messages
- 2,369
- Location
- Long Island NY
I believe it's a CY piston but not all Zenoah pistons are smooth. Scroll through ddm's listings of pistons and you'll see what I mean. Even ESP uses the dimpled cy for his 'High Rev' pistons.
- Messages
- 7,044
- Location
- Nj
I'd prefer not to have one as I'd think it would give carbon a reason to build up on the piston more
- Messages
- 13,105
Just go run it, it's either gonna go or blow up.
- Messages
- 3,624
- Location
- Queens
but y, and why do they have those lil holes on top
MonsterAir
Lone Racer 🤠
- Messages
- 2,369
- Location
- Long Island NY
If I remember correctly guys who do their own porting and piston mods will scuff up the surface of the top which gives better atomization? Meaning better fuel burn. So I would assume CY does this for the same reason? and I have no clue why the hole is there.
- Messages
- 7,044
- Location
- Nj
Its so their more aerodynamic in the cylinder like a golf ball duh
- Messages
- 3,624
- Location
- Queens
yeah and hole is for less resistance right?
- Messages
- 7,044
- Location
- Nj
Sure sounds good 
- Messages
- 3,624
- Location
- Queens
aight imma go drill a hole in the center of my pistons, thing is gonna rev to the moon 
- Messages
- 13,105
If the crank doesn't have the fuel mixed good enough with the air, I assure you the piston finish isn't going to help much. It's just as cast, the hole in the center is for the finishing machine to center point off of. Has nothing to do with revs or any such nonsense.
- Messages
- 3,624
- Location
- Queens
I
always thought it had something to do with spark tbh
- Messages
- 13,105
enzo3856
Well-Known Member
- Messages
- 174
- Thread starter
- #99
So I spent a few hours on Sunday getting the motor back together, and putting the car back together. Got a new coil, new plug, velocity stack and air filter.
Went with the copper gasket and loctite 518.
Took it out back and it took a while but it's running.
I normally use the choke but it was not going... choke off and tried starting like I see many do on YouTube. Finally came to life!!!
It felt nice and tight when I pulled the cord, so good compression. And once running, it sounds strong. Good steady idle. Let it run for maybe 5 minutes and let it rest.
My Final squish was .185
Appreciate all the help here!!
Went with the copper gasket and loctite 518.
Took it out back and it took a while but it's running.
I normally use the choke but it was not going... choke off and tried starting like I see many do on YouTube. Finally came to life!!!
It felt nice and tight when I pulled the cord, so good compression. And once running, it sounds strong. Good steady idle. Let it run for maybe 5 minutes and let it rest.
My Final squish was .185
Appreciate all the help here!!