means you pinched one of the brown dome O rings installing the head... assuming you are running a aftermarket head... if not you may need to retorque the head if it's stock
it has compression because you can hear it? wow check the compression dude hold the throttle wide open and kick until the needle stops moving. needs to have more that 105lbs
should be between 71-73 ro and these tires "should" hook harder than a 14 extreme in the same RO i wouldn't suggest them for a 4mil unless you are making some decent power. not in anyway trying to cause a lost sale, just making sure you guys know the difference between a 12 paddle extreme and a taller hauler/ripper. a 79ro in the same cup will pull a non ported 10 cub down pretty good. hope this helps.
i would just start a new account. first you ask a question that is up there with "where is my powerband in my motor" then you lie saying your brother posted it...
pass
hell i will run it even if it takes all 6 minutes to lose the 6lbs. just know you have to jet for it. it's the leaks that happen after jetting that kill engines