ok did a search and got 2 answers what is the correct one?

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From the factory it probably was 100/1 but the motors were having problems with lubrication then Yamaha revised it to 50/1.
Use 50/1.
 
You can at any time, have too little oil in the mix. RESULT: BAD to VERY BAD
Having just a little more than necessary.....RESULT: GO FISH
 
Look at the fuel inlet, there should be a little placard there that says what the mix should be. It may have a film or residue on it so you may have to wipe it down to see it. If not there pull the cowling off and look on the motor.
 

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