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For every 5mm change in shock length you will see a rough ride height change of half an inch.
If you wanted to lower the rear of the bike about 2 inches you would want a 300mm shock length.
I installed a 325mm length shock and saw a measured increase of 12mm.
OneLeggedRider installed a 290mm shock on his Hawk and saw a decrease in height of 3 inches.
AFAIK he never had an issue with bottoming out the bike even with that much of a drop. A big part of that is due to the fairly limited suspension travel these bikes have compared to a proper dirt bike. The rear wheel only has a little over 6 inches of total travel at most.
Just two examples to show the numbers in practice.
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