Anybody have experience with using Yamaha 2 stroke OBs?   I just bought a boat with a 9.9 HP Yamaha.  I googled the fuel mixture and it is 100:1, but I found mention after mention of people using 50:1 despite the mfr's recommendation of 100:1.  Some were advised by their mechanics to use 50:1.  Most said they ran 50:1 without issues.

 

I have 6 fresh gallons of 50:1  that I bought for my old boat and was wondering if I should use it as is, or cut it.

 

 

 

 

You should be fine. If anything it may run a little smokier

I sent an email to a buddy that works for a dealer here in Texas as an engine mechanic. That said, I think Slonezp's thought is a very reasonable expectation ... You'll be sending some small smoke signals worst case. I'll drop an update here if I hear back from my contact.

50:1