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Author Topic:   9.9-HP Rating

towboater posted 05-10-2009 02:00 PM ET (US)
Why are kickers rated 9.9-HP? Obviously, 10 HP is the magic number to invoke some sort of liability, just curious what it is all about. Thanks. mk
Tom W Clark posted 05-10-2009 02:24 PM ET (US)
Historically, 10 HP was a state licensing threshold.
20dauntless posted 05-10-2009 02:39 PM ET (US)
There are also some waterways which require all motorized vessels to be powered by engines that are less than 10 horsepower.
Tom W Clark posted 05-10-2009 02:45 PM ET (US)
Yes, and there may some insurance policies that have a 10 HP threshold as well.
towboater posted 05-10-2009 03:44 PM ET (US)
Yeah, I guess the [unclear acronym] and Underwriters need to draw the line between single and twins somewhere. No prob. Thanks. [Changed TOPIC to suitability of certain motors for his boat. Please begin new discusion for this topic. Thanks--jimh.].
gss036 posted 05-11-2009 12:07 AM ET (US)
I always thought is was because most small fishing lakes do not allow motors of 10 HP or greater on them so way back when most mfg's rated the motors for 9.9 HP. My 1st 9.9 Evinrude was in 1975.
weekendwarrior posted 05-11-2009 08:25 AM ET (US)
It sounds like there are several reasons and 10hp was for some reason chosen as the common magic number. Around my area there are several lakes that state no engines 10hp or greater.
Tohsgib posted 05-11-2009 11:34 AM ET (US)
Mainly for lakes in my opinion.
R T M posted 05-11-2009 01:59 PM ET (US)
They built 9.9 and 9.8 motors in the forties. I don`t think insurance liability was a concern way back then. Also outboards were a relatively new thing and large outboards were a rarity, so I don`t think the power limits on lakes was an issue either.
rich/Binkie
jimh posted 05-12-2009 01:03 AM ET (US)
My understanding is the same as Tom Clark's. In many states a boat with a motor under 10-HP was exempt from being registered and thus paying a registration fee. This created the 9.9-HP motor.
15ftlover posted 05-18-2009 11:36 PM ET (US)
In SC you do not need to register an outboard less than 10hp, which makes transfers/sales much easier

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Author	Topic: 9.9-HP Rating
towboater	posted 05-10-2009 02:00 PM ET (US) Why are kickers rated 9.9-HP? Obviously, 10 HP is the magic number to invoke some sort of liability, just curious what it is all about. Thanks. mk
Tom W Clark	posted 05-10-2009 02:24 PM ET (US) Historically, 10 HP was a state licensing threshold.
20dauntless	posted 05-10-2009 02:39 PM ET (US) There are also some waterways which require all motorized vessels to be powered by engines that are less than 10 horsepower.
Tom W Clark	posted 05-10-2009 02:45 PM ET (US) Yes, and there may some insurance policies that have a 10 HP threshold as well.
towboater	posted 05-10-2009 03:44 PM ET (US) Yeah, I guess the [unclear acronym] and Underwriters need to draw the line between single and twins somewhere. No prob. Thanks. [Changed TOPIC to suitability of certain motors for his boat. Please begin new discusion for this topic. Thanks--jimh.].
gss036	posted 05-11-2009 12:07 AM ET (US) I always thought is was because most small fishing lakes do not allow motors of 10 HP or greater on them so way back when most mfg's rated the motors for 9.9 HP. My 1st 9.9 Evinrude was in 1975.
weekendwarrior	posted 05-11-2009 08:25 AM ET (US) It sounds like there are several reasons and 10hp was for some reason chosen as the common magic number. Around my area there are several lakes that state no engines 10hp or greater.
Tohsgib	posted 05-11-2009 11:34 AM ET (US) Mainly for lakes in my opinion.
R T M	posted 05-11-2009 01:59 PM ET (US) They built 9.9 and 9.8 motors in the forties. I don`t think insurance liability was a concern way back then. Also outboards were a relatively new thing and large outboards were a rarity, so I don`t think the power limits on lakes was an issue either. rich/Binkie
jimh	posted 05-12-2009 01:03 AM ET (US) My understanding is the same as Tom Clark's. In many states a boat with a motor under 10-HP was exempt from being registered and thus paying a registration fee. This created the 9.9-HP motor.
15ftlover	posted 05-18-2009 11:36 PM ET (US) In SC you do not need to register an outboard less than 10hp, which makes transfers/sales much easier