by zero i mean the needle never moved?

 

so the 72.5 would mean have to have it bored out to that spec?

 

OK here is the latest report
I took it apart what a PAIN IN THE ASSSS WOW .but goe it out THE RINGS WHERE IN
PIECES, NOW HOW DO I TELL IF I NEED A BORE JOB
thanks

 

Did you measure it?
You need to at least hone it, even if your going to put a stock size piston in.
If you decide to bore it, you need to bore it to the spec. on the piston. If you buy a Wiseco piston, it will tell you the bore size on the instructions. Or any good engine shop would know.
The proper way is to measure roundness is with an inside Micrometer.
If you can't measure for out of round, then you can hone it and see what it looks like. But its a gamble if you can't measure it. If its the stock cylinder, or stock original piston, most likely you should go ahead and bore it.


Its not going to be 100%, boring only costs like $30, its the best thing to do, to be sure its good.

If your rings are in pieces, you need to take the entire engine apart and clean it out, the crankcase and bearing etc. Inspect for damage.

 

the jug is at the shop they will let me know what size i will need after they bore it out,
i did find all parts of rings ,they fell off when i pulled the jug, thanks for all your help

 

need suggeston hear since i have this apart , any of you think it is wise to close off the oil pump an go with straight 32/1 mix in gas tank?

 

Polaris oil injection is as good as it gets.As long as it is working leave it on.