Iím looking at buying a 2009 rental return VX1000 with 816 hours. It starts right up and revs right up quickly to 7,000 rpm but goes 35 mph 180 lbs person on it and to pull a 100 lbs kid on a tube 25 mph. Is this the correct speed for this ski? Is 816 hours a lot on a ski? Iím concerned on the rpms itís turning but not speeding up. I can buy it for about $2,000. We run them about 20 hours a year. Please send your input. Thanks.