I would do has Bass Cat suggesed below I just pulled my two web plugs off the internet and added comments of what I have heard around the industry. I will say if its out of warranty then you can do what ever you want. I will also say if its still in warranty and Yamaha finds out they will not warranty your motor. just my .02http://www.simonmotorsports.com/yamahaecu.htmlhttps://ecunleashed.com/tag/yamaha-vmax-sho/Two comments, first if its out of warranty it doesnt mattersecond they say other then RPM could be higher they can not see the flash, its up to you to keep RPMs in check. The Sho can be cranked up from a 200 to 340 HP but the RPMs go up to. I am not sure if its worth it but a lot of people do Flash the SHOLast edited by Phoenix 921 on August 19th, 2017, 3:19 pm, edited 2 times in total.
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