How does that work?

they strip the chrome off and then re-chrome it. simple.

>"Ok so how do you explain the different materials at inside edge of intake port"
maybe you are referring to the chrome or maybe a casting flaw but I have never heard of any of these cylinders as having an iron sleeve.
if it has a sleeve then a magnet will stick to it. Do that test and report back.
 
jag and butre your right no steel magnet don't stick!so now how is it simple the local machine shop that does rechrome or nikisal told me to bring just the sleave when I told him that it was one piece he laughed and told me they can't do it,so I am asking how is it done then!
 
jag and butre your right no steel magnet don't stick!so now how is it simple the local machine shop that does rechrome or nikisal told me to bring just the sleave when I told him that it was one piece he laughed and told me they can't do it,so I am asking how is it done then!
find a better machine shop. sleeved cylinders don't need plating.
 
local machine shops don't strip and replate cylinders. Only a few shops in all the US have the means to do that.
US Chrome is one of them.
 
OK, here is the skinny:
These cylinders are chromed. A very thin flash of chrome over the bare aluminum.
This is a very inexpensive process when done in mass production. 1970s snowmobiles were often done this way.
The advantages are 1) economical to produce, 2) cool very well, 3) long cylinder life if well cared for, filter and mixtures. 4) lightweight
The problems are 1) can bubble or separate from the aluminum. 2) can scratch or tear

Modern motorcycles are typically nickle/silicon plated where a matrix of nickle holds a silicon wear surface.
This has all the advantages of chrome but adheres well and wears even better.

The colour change you see is just where the chrome starts and stops.
When porting to the edge of the chrome I "roll" the chrome edge in.
Like deburring but I used pressure instead of a cutting tool.

I've sent cylinders off to Quebec to be replated with nickle/silicon, cost is about $250 a cylinder.
You might get a hydraulics shop to chrome replate your cylinder at a cost of about $100 for an aluminum hydraulics cylinder.

There are no liners for our HT motors that I know of.
There are repairable, but at a cost of $100-$250 it is not economically feasible.

Steve
 
Electro plating has an anode and a cathode. The plating ions move between the two by the shortest path.
The plating sacrifice bar is put up the center of the cylinder bore. It plates the cylinder walls and just barely into the ports.

Steve
 
Oh well that makes sense! I have never seen or had it done so I didn't know thanks brother!Im torn now between that process and say maxiscoot mxs top end witch will still be more money and the minirelli cylinder is cheaper but by the time you add up all the parts not much,I was hoping to find a shop that could do a half doz at once to try and reduce the cost of each maybe thats just wishful thinking!
 
There are no liners for our HT motors that I know of.
There are repairable, but at a cost of $100-$250 it is not economically feasible.

Steve
i may be wrong but i'm sure i seen a vid on youtube of a guy with sleeved engines will have a snoop later when i get a chance
 
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