I have a 81 SRV trail sled with a 90 HP engine. It weighs in at 470 lbs. I wanted something lighter. This one started with an Ultra chassis that we cut off everything forward of the ft bulkhead. Made a Yamaha style front axle out of Alum to look like SRV them fabricated some very small struts that used Pri clutch springs to again appear Yamaha and fit correctly in the Yamie hood. Everything not needed was removed. End result, it weighs 358 LBS.We then made mounts to put on all the 86 SRV body work handle bar pads, gas tank cover seat etc. Honestly with the hood closed almost no one knows its not a stock SRV.