My Suzuki boulevard 1500cc C90T the F1 red light stays on

Behind the right side cover.

https://www.motorcycleforums.net/threads/c90t-b-o-s-s-flasher-relay.53698/#:~:text=It%20is%20behind%20the%20charcoal%20canister%20under%20the%20right%20side%20cover.

Pictures
https://www.google.com/search?q=2013+Suzuki+Boulevard+C90T+flasher+relay+location

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try removing positive cable from batt. for 5min.
replace turn ign. switch on about 5sec. dont crank it.
cut it off.now crank it.
see if that correct he problem

People resurrecting posts from 2013! You think he still has the bike and needs this fixing?

• T Miner Sep 03, 2017
  Try experimenting with the octane level of your gas. Might help.
• 
  johnny bonacci Sep 03, 2017
  check for loose motor mounts or a loose exhaust.
  

https://www.google.com/search?q=2009+Suzuki+Boulevard+C90T+excessive+vibration

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There is a way to obtain the fault code that is causing the issue. From the fault code you can cross reference that with what sensor is throwing up the flag. Then you can determine what you need to do to fix it. Throw me an email at [email protected] and I will help you. It is actually way easier than you think!

the bike has efi.
if the f1 light is flashing then it looks as if a dealer is your next port of call as the fi would indicate a problem with the efi (electronic fuel injection) system

hope this helps.