low compression. found out why, need some advice on what to do now
trx450r 2005. so i just got my motor put back together from the top end rebuild i did and i couldnt start it. so i went through all the trouble shooting and such, gas is good, carb cleaned, timing is good, valve clearance is to spec, it gets spark, wiring is good.
so yesterday i try a compression tester and find i only have about 25 compression when i should have around 108. i check valves for a bent valve, but theyre all good. while the head was off i ran my finger along the cylinder wall and feel a horizontal line down the cylinder that feels like its sticking out past the wall.
so i read that a bad cylinder or rings could cause bad compression so i did the test i read about on here to see if the cylinder was the problem. you take 2 teaspoons of oil, put it in cylinder head so it creates a seal that the now deformed cylinder isnt and you do the compression tester again. if the compression is higher, then your cylinder is why you have low compression, if its the same, then thats most likely not your problem.
today i tested compression and it was 0, the needle wouldnt move at all, and after i did the test it was the same. why is my compression 0 now??! also right after i kick it i can hear air escaping from somewhere, like a flatening tire sound. the compression tester gauge is in tight, so air shouldnt leak. what should i do now????? buy a new cylinder and rings? can i still re use my new wiseco 11.5.1 high comp piston i bought for this rebuild? i dont understand is wrong. everything checks out, even valves, the only thing that MAYBE doesnt is the vertical abnormal line in the cylinder. why is my compression 0 now and last night it was like 25!????? help i need some advice please!!!