Like I said in my previous post a neighbor gave me motorized bike and when I took it apart this is what I found and I can't for the life of me figure out what could have done this... so any input would be appreciated. Take a look at the pics.
What would have caused this scarring on the cylinder wall?
- Thread starter Rexx Shyt
- Start date
Probably was caused by slag around the port openings that was not removed after casting, that’s why I take every engine apart when I get it, to do what should be done before hand.
In the picture you can see the rough edges of a iron sleeve cylinder that needs cleaning up.
This is a chrome plated cylinder. Very thin. It was manufactured improperly. Most of them are. What you have right there is a cylinder worn out. When the chrome plating flakes off the aluminum bore your pictures show the result. Over time this will result in power loss and a no start condition. Eventually you got 0 compression.
Greg makes an excellent point. when you get a new engine / or kit you must inspect the cylinder walls for debris and spalling. I have received brand new cylinders with the chrome plating flaked off right out of the box. Right now you need a new Cylinder and Rings.
I have a couple of rotary tools but find the cheapest one from harbor freight to be the easiest to use on ports, its not that powerful so I have to go slow, that prevents mistakes. I ordered long shank carbide rasps from Amazon, I taper the ports to prevent rings from snagging the ports.
Here’s a cylinder only from eBay.
BGF 80cc steel IRON sleeve 47mm bore cylinder 2-stroke GAS motor bike engine A | eBay
See picture.
www.ebay.com
