Here are a couple Yamaha Enduro's, that have been modified. I have not done this modification. Alot of people like to swap a 175CC top end onto the 125CC models. This is taking it up to 200CC, with this engine swap. I usually am not a fan of customs, but this seems pretty cool. The numbers matching engine could be removed and placed on a shelf and installed when you wanted to sell the bike. I also wanted to mention that we have the service manual for the blaster. I was thinking the manual might be useful for situations like this. Yamaha has lots of parts interchangeability as well.

https://www.legends-yamaha-enduros.com/_files/ugd/f5d852_65bd29d9987f48dcb44bf5df893b2aac.pdf?index=true