(New) 2000 Mountain max 700... very curious... any thoughts?

Hey - I've owned one sled from each of the other brands - decided it was time to try out Yami...

Just picked up over the weekend - here's what it's got:

700 triple
Triple pipes (power inc)
V force reeds
HiTech clutch / possibly just the kit? primary and secondary
Custom airbox
151 2" track
Custom paint, hood, handle bars, risers, upgraded suspension (so previous owner says)
Down geared for climbing
Overall great shape
$1500 (good deal? - bad deal?)

I got it because I'm looking for something that will really climb and I was assured that this would do it - With all the mods - I'm thinking it will... your thoughts? Guy said it'll hang with stock 900's on climbs - I'm hoping so!

NOW the curious part... COMPRESSION is at 55-57 psi in each cylinder... I thought it had to be a bad tester - so I switched testers - same result... I assume I need a top end rebuild ASAP? Starts first pull - runs pretty well... slight hesitation when you nail it... another slight hesitation as clutch engages (if throttling up slowly)

BUT - this is on last years gas with a stabilizer in it - is that what's going on? or compression? or normal? or something else?

Cheers and any thoughts would be awesome

Thanks for your input... That compression is baffling isn't it...

all spark plugs out, 6 pulls each, throttle wide open... I'm 6'5" and 200 and was giving it everything I had haha...

It would just be strange that 2 different comp testers would be bad with the same numbers right??? about 2 psi difference between individual cylinders...

Good thought on the jetting being out... it's jetted for 4k feet and 30 F... I was testing @ 75 F and sea level...