Re: 1999 Mariner 125hp carbed 2 stroke autolube
Thanks for the info Gerry.
The engine is on a Raider 18ft which is a British built fast fisher weighing about 1,400lbs that my friend bought a couple of months ago.
The engine has only done 120 hours & is in perfect condition.
The prop is a 13.25" Laser 2 with 20" pitch.
We took the boat out this weekend to see how it performed & TBH were a little disappointed.
Acceleration was excellent & the boat topped out at 30.5kts at 5,200rpm.
That would suggest that the boat is correctly propped.
However I have an identical boat with 10hp less & we were expecting at least the same top speed.
My engine is a Honda 115 EFI running a 13.25" x 15" pitch stainless Honda prop.
This gives 36kts at 5,600rpm
Given that the gearbox ratios of both engines are almost identical (2.07 for the Honda & 2.08 for the Mariner) the fact that the Mariner revs 400rpm less flat out should be more than offset by virtue of the much bigger pitched prop I would have thought & we were expecting the Mariner engined boat to be at least as quick as mine if not quicker ?
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