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I think the tank is 8 gal. (it's the medium size)
I don't have a clue what this machine weighed stock (ADB claims 350 lbs) if anyone has put a 503 on a scale I would love to hear some numbers. as far as final weight ??????? I work as an aerospace tooling maker, I think It's possible to shave 35lbs (maybe more?) off my machine and not sacrifice strength. see what kind of mad sceintist **** we can come up with!
when I'm done i'll post some weight, final and do some creative weighing to get stock weight.
rotax claims 46 H.P. 503f
57 H.P. 550xf
numbers seem a little low?