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Discussion Starter #1
I just recently purchased a 2010 EFI YFZ450r from a private seller. Fresh rebuild. Stock engine all OEM parts besides a stock sized vertex piston. The owner ran VP T4 fuel in it. What do I have to do to get it back over to 93 pump gas.
 

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Discussion Starter #3
I figured. I don’t know why they were running t4. Seems excessive. I won’t have to do a tunes will I if I switch back to 93?
 

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if you have no lid, aftermarket exhaust, and possibly an aftermarket filter.... you will need to tune it. Just look in the blaster interface to see what they put in there. it's pretty simple and you will see if has any special settings.
 
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