Help!! My is my jug shot?

[Vintagemotorized]

my bike has had compression issues after I ported and polish the engine at first I blamed the base gasket that I made out of cheap gasket maker (it was pretty much bare metal) but when I removed my jug I found these scratches on the cylinder wall going from the top to one of the ports I believe this could of been some burs from when I was polishing the jug

 

[Frankenstein]

Definitely looks like you messed something up..... The only help you can get is to buy another top end I suppose.. You ain't replating that..

 

[crassius]

hard to tell from pic, but if your fingernail doesn't get stuck in one of those grooves they may not be deep enough to weaken motor very much

I'd try a GENTLE honing with a nice straight cylinder hone & lots of oil then see if it runs.

 

[Vintagemotorized]

I tried puting the jug back on and broke a ring so i need new ones

 

[Deleted member 12676]

What oil ratio did you use?
Do you have a paper air filter or an oiled foam one?
Do you have a high compression head?