2000? Blaster Hybrid

[twissted]

Just purchased a 2000 and something blaster chassis with a 96 Yamaha Yz 80 motor in it. Quad runs pretty good but looking to put our 2007 Honda CR 85 MOTOR in it. How much fabricating is really needed to make this happen? And reason for the switch is not keen on existing motor being so old and very familiar with low end LACK OF POWER of the YZ's. Thank you for the help guys/girls

[headache]

not sure how much more modding would have to be done to get the cr motor to fit, but no 80cc motor is gonna have any low end power, especially in a quad frame that weighs way more than a bike.