Hello, I am new to this site and could really use some help. I had picked up a 2000 Yamaha blaster a couple weeks ago and when I got it the guy had a receipt for the blaster just being rebuilt 1 week before I got it, but when he brought it, it would start after 3/4 kicks and it would run but wouldn't idle and as soon as you went to move in first gear it would bog and shut off. now if you were really on the gas it would go. I asked him if it was ever jetted because it has a full fmf exhaust and had no airbox lid. and he said the carb was rebuilt but it had stock jets in it. so I was almost certain it was a jetting issue. So the first thing I did when I got it was did a compression check even tho it felt great with kicking and using my hand I wanted to get a number anyways, I got 120psi. was told that was not great, but good. so next I tore carb off and checked the reeds, they had a nice gap on them but weren't chipped or anything so I was happy they didn't chip and go into the cylinder so I replaced those, started it once and still had the same issue with it not having any low end power so to speak. so I took it somewhere to get it jetted professionally because I was never good at getting jetting correct. when I took it there I asked them to put a heli coil in the drain plug because I knew it was leaking and stripped because the guy had warned me about that. when they called me the next day they said they jetted it and when they put the quad up to do the drain plug they had noticed it was leaking on the bottom where the 2 cases meet. which I should have taken a better look before I bought the quad but unfortunately I didn't. so they put the new drain plug in and put a small amount of silicone on the bottom of the 2 cases where it was leaking and it stopped the leaking but now it is burning gear oil. It is smoking excessively, they told me I probably didn't notice before because when they drained the gear oil out, a very small amount came out so it wasn't able to suck as much through. so in order to save money I told them to stop there because I didn't want to pay a shop to split the cases. so my next step is a leak down test. so my questions are, With the leak down test, how much do I pressurize the cylinder, for example, 5 psi/10psi. and after it is pressurized how do I pinpoint which seal is leaking? I know the old soapy water trick but is that about the only way? even tho all the evidence leads to the halfcase gasket(I believe that's what its called where the 2 cases meet) I'm really hoping its a crank seal which seems much easier to replace. and could this be the root of all my problems? would it leaking gear oil into the cylinder cause it to not want to run at low rpms? because if you start the quad and rev it, it will be fine, after it was jetted it will even try to idle for a quick 5 seconds before it shuts off, but as soon as u try to take off in first gear, it will bog and shut off, but if your really on the gas it will go. it has spark, its getting fuel, has compression, new reeds, new ngk spark plug. sorry for the lengthy post, just like to try to explain everything the best I can. thanks for the help ahead of time guys.