Exhaust Ring on Optimax

Bait&Sea

Active Member
I have a 135 Optimax that has been great for 900hrs, I have a 4blade Merc TrophyPlus prop with the smaller 4.25" exhaust tube that I would like to try on it. I know Merc has an exhaust ring to prevent exaust escaping between the 4.75"gearcase and the 4.25" prop tube. My concern is with choking down the exhaust flow on the motor and messing up backpressure or creating a condition that could be harmfull to the motor. I have tried to Google it and found many people run these rings but not sure how many were on an Optimax. Anyone have any experience with this scenario?
 
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