WOT RPM range

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JEB
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WOT RPM range

#1 Post by JEB » Thu Apr 05, 2018 3:11 pm

I have a 1998 Johnson 150 motor, does anybody know where I would be able to find what the RPM range is for this engine? Every chart I have found does not go prior to 2006 on the 150. Any help would be appreciated. Thank you.
JEB
NEW-2019 Barletta L25UC
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1985 Starcraft SD240
New to me-1998 Johnson 150 carbureted
Traded in-1979 Johnson 140
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Retired OG
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Re: WOT RPM range

#2 Post by Retired OG » Fri Apr 06, 2018 5:51 am

I'd suspect between 5-6K....if you don't have a service manual, I'd suggest you get one...
1973 Kayot with 1972 Evinrude 50 hp Lark

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wwind3
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Re: WOT RPM range

#3 Post by wwind3 » Fri Apr 06, 2018 5:52 am

[quote="JEB"]I have a 1998 Johnson 150 motor, does anybody know where I would be able to find what the RPM range is for this engine? Every chart I have found does not go prior to 2006 on the 150. Any help would be appreciated. Thank you.[/quote]

Most things I Googled --forums, iboats say WOT is 5500rpm with operating ranges between 4500-5500... Try to set it up depending on boat toward the upper limit of operating range. My 2009 90 hp Merc top end is 5800-5900---and if you hit it you get an alarm--not sure about the older motors. Good luck....

Usually running a motor at WOT and getting lower rpm's than what manufacturer states for motor is not good for motor. Major contributor is the prop.. Changing pitch of my prop by 1 inch on my pontoon boat makes a difference of around 350 rpms..

Again--raising or lowering engine on transom and changing props/pitches etc are the main things you can do to change boat performance.
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Bamaman
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Re: WOT RPM range

#4 Post by Bamaman » Fri Apr 06, 2018 6:43 am

Somewhere inside the engine cover, the rpm range is usually noted. 5800 is about normal on 2 strokes.
'12 Bennington 24' SSLX Yamaha 150

captain28570
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Re: WOT RPM range

#5 Post by captain28570 » Fri Apr 06, 2018 8:35 pm

Those old 2 strokes pretty sure were 5500. Even the newest 2 strokes do best around 5600 to 5800.
2017 22 Manitou Aurora LE SHP Tritoon Evinrude G2 HO 150

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