If you want decent secure well built security for any motorcycle - then you have to start with a seriously heavy and strong chain and padlock that you secure around and through the bike frame to the ground via a suitable equally strong post or ground anchor.
Most of the locks and padlock combination you buy for under £100 / $ 150 are cheap and easily defeated in probably less than 30 seconds with a bolt cropper
You need to buy a chain that is bigger than 13mm 1/2" link diameter - I use 19mm 3/4" link
You need a padlock that is cen6 rated -I use squire SS65CS or Abloy 362 padlocks
Then ground anchor - I use torq anchor
This lot will cost you around £270 -$400
They can not be bolt cropped by hand croppers - impossible / almost impossible to pick
However like anything, thermite, angle grinders and oxy-acetylene will cut through it!
If someone really wants it - they will take it - all you can do is slow them down / deter them
In UK look at either
Sold Secure Approved & Police Approved Ground Anchors, Security Chains and more - Buy from the Manufacturer
(I can recommend them) or
Almax Security Chains Limited
Both sell top quality chains - security for bikes also sells top quality ground anchors
Almax shows videos of the normal chains cut in less than 30 seconds
You get what you pay for with security - like all things in life.
Abloy locks can be bought on eBay -the 362 is a beast of a lock!
Only trouble is you do not want to carry this chain and lock - weighs too much!