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#408110 - 05/23/08 08:10 PM 2 stroke or 4 stroke - how do I tell
tanjacap Offline
Warrant Officer

Registered: 07/15/06
Posts: 4
Loc: Wyoming MI
I just bought a dinghy. It has a 2001 15 hp Johnson model j15rsib. How do I tell if it is 2 stroke or 4?

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#408204 - 05/24/08 08:01 AM Re: 2 stroke or 4 stroke - how do I tell [Re: tanjacap]
GoFirstClass Offline
Retired Boating Bum
Grand Poobah

Registered: 11/21/03
Posts: 13763
Loc: Pasco, WA
Get the model and serial number off the engine and call one of the outboard dealers in Detroit along the river. They'll be able to tell you.
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#408206 - 05/24/08 08:04 AM Re: 2 stroke or 4 stroke - how do I tell [Re: GoFirstClass]
jtheile Offline
Admiral

Registered: 02/27/05
Posts: 1865
Loc: North Ridgeville, Ohio
GFC, Wyoming is on the good side of MI, it's outside of Grand Rapids.
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Joe
Four Winns 225 Sundowner

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#408263 - 05/24/08 01:11 PM Re: 2 stroke or 4 stroke - how do I tell [Re: jtheile]
Al Offline
Nautical Alchemist
Grand Poobah

Registered: 01/14/03
Posts: 14996
Loc: Vagabond Wanderer from Mich.
Look for a oil filler cap. If it exists, its likely a 4 stroke. However, many 2 stroke engines also have oil injection for their larger engines - whether or not it includes 15hp or not, I am not sure. For many of the smaller 2 stroke engines, you still have to mix oil yourself (I have to with my 2004 Mercury 5hp dinghy motor)

I am going to guess though that it is a 2 stroke, as I don't think Johnson makes any small 4 stroke engines.

But I don't know for sure, so best thing is to look up the model number on-line or consult a dealer.
_________________________
President and CEO - Napmoor and Doolittle.




2004 Mercury 270 Airdeck Dinghy.
2011 Four Winds 28Z Class C Motorhome (Ford E450).

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#408265 - 05/24/08 01:19 PM Re: 2 stroke or 4 stroke - how do I tell [Re: Al]
Al Offline
Nautical Alchemist
Grand Poobah

Registered: 01/14/03
Posts: 14996
Loc: Vagabond Wanderer from Mich.
Look here:

http://www.usboatsupply.com/pdf/EJ/ModelNumberRefGuid2005.pdf

Apparently, a 4 stroke would have a 4 in the model number.
_________________________
President and CEO - Napmoor and Doolittle.




2004 Mercury 270 Airdeck Dinghy.
2011 Four Winds 28Z Class C Motorhome (Ford E450).

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#408404 - 05/25/08 02:25 PM Re: 2 stroke or 4 stroke - how do I tell [Re: Al]
deepv Offline
Safety Officer
Admiral

Registered: 03/17/04
Posts: 8498
Loc: SoCal
Use your nose when its running.
_________________________
72% of fatal boat accidents are caused by
boaters that haven't taken a safe boating course.


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#408414 - 05/25/08 04:59 PM Re: 2 stroke or 4 stroke - how do I tell [Re: deepv]
seabuddy Offline
Admiral

Registered: 12/15/02
Posts: 28862
See if you can lift the engine without trouble.

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#408428 - 05/25/08 07:15 PM Re: 2 stroke or 4 stroke - how do I tell [Re: seabuddy]
Al Offline
Nautical Alchemist
Grand Poobah

Registered: 01/14/03
Posts: 14996
Loc: Vagabond Wanderer from Mich.
Also on a 2 stroke, there should be somewhere inicating to mix oil 50:1 in the gas, or some other ratio.
_________________________
President and CEO - Napmoor and Doolittle.




2004 Mercury 270 Airdeck Dinghy.
2011 Four Winds 28Z Class C Motorhome (Ford E450).

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#408443 - 05/25/08 08:42 PM Re: 2 stroke or 4 stroke - how do I tell [Re: Al]
Tanja Offline
Warrant Officer

Registered: 06/19/06
Posts: 16
Loc: Michigan
Thanks for all input, after much looking around, (tanjacap is my husband) he was able to verify it is a two stroke. Working great.

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