im looking at buying a 1979 yamaha srx. my question is how much horsepower does this year have compared to previous years. i know that they detuned them because they were being used as a trail sled and 98 horse was to much. i also know that in 77 they changed the frame from a heavy material to a lighter one. also would it be able to beat my friends indy 500 across a lake. if you have read a lot of my post before you would see that i will sacrifice anything except money for speed.