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PostPosted: 17 Apr 2018, 17:07 

Joined: 07 Sep 2017, 23:08
Posts: 26
Wondering if anyone knows the whole process of the conversion. There are a lot of different opionions on what needs to be done. Is it just a carborator change or us there really more to it.

Please help. Thanks alot


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PostPosted: 17 Apr 2018, 18:17 
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Joined: 15 May 2010, 00:38
Posts: 2504
Location: Central Florida
Yes, I know the complete and proper process. Depends on the year though and you can do some of the homework.
Obviously the main difference is the carburetor.
Second will be the tuner vs an exhaust tube in the exhaust housing. Look this up for the model year
Third will be the shim under the reed stop that allows the reeds to open a bit further. Look this up as well.
Typically, the next question will be "can I just get away with the carb change?"
Up to you. All three changes combined make for a great performing engine.


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PostPosted: 17 Apr 2018, 19:50 

Joined: 07 Sep 2017, 23:08
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I believe its the early 1987 model and serial numbers on the plate are gone so I am having trouble finding exact model number. Is there any other way to find out ?


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PostPosted: 17 Apr 2018, 20:10 
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Location: Central Florida
the 1987 model year should have a model number with "CU" in it. The second line under the model number is the serial number.


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PostPosted: 20 Apr 2018, 07:49 

Joined: 07 Sep 2017, 23:08
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All numbers are worn from the plate


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PostPosted: 20 Apr 2018, 20:03 

Joined: 05 Oct 2014, 13:19
Posts: 183
Is the thermostat on the top or bottom of the head? What tiller assy does it have? Decals anywhere? What color is it? There were a few changes with the electronics also. Ya otta be able to narrow it down quite a bit..



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2 stroke every time I can
4 stroke only when I have to..I don't like boating with my lawn mower
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PostPosted: 20 Apr 2018, 20:38 

Joined: 07 Sep 2017, 23:08
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I will take a pic of it tomorrow and post it


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PostPosted: 20 Apr 2018, 22:11 

Joined: 04 Feb 2013, 22:11
Posts: 356
Markb63 wrote:
All numbers are worn from the plate
Can you retrieve any numbers from the welch plugs?


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PostPosted: 21 Apr 2018, 16:55 

Joined: 07 Sep 2017, 23:08
Posts: 26
Here's some pics

If need anymore or different angles let me know

I appreciate all the help


0421181607b_HDR.jpg
0421181607a_HDR.jpg
0421181608_HDR.jpg
0421181606_HDR.jpg
0421181608b.jpg
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PostPosted: 21 Apr 2018, 17:11 
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Joined: 15 May 2010, 00:38
Posts: 2504
Location: Central Florida
See the "CU" in the model number in the Welch Plug? That was written for you in my early post...............
That indicated the 1987 model year.


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PostPosted: 21 Apr 2018, 17:52 

Joined: 07 Sep 2017, 23:08
Posts: 26
Does anyome know the process of the conversion of this model


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PostPosted: 21 Apr 2018, 18:06 
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Joined: 15 May 2010, 00:38
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Location: Central Florida
Feel free to correct me if I am wrong but...............are you NOT reading what has been posted?
Already told you what has to be done to do the job correctly as well as the part about the "CU" being in the model number.
Read what has been written !!


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PostPosted: 21 Apr 2018, 20:35 

Joined: 07 Sep 2017, 23:08
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I was trying to say that now that I found the model number and the yr is 1987 if that gave anyone a better idea on exactly was has to be done for that exact yr and model. For the conversion jeez sry


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PostPosted: 21 Apr 2018, 20:37 

Joined: 07 Sep 2017, 23:08
Posts: 26
Not great around boat motors. Just trying to find out what I'm in for


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PostPosted: 22 Apr 2018, 13:00 
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Joined: 15 May 2010, 00:38
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Location: Central Florida
Don't get all butt-hurt. Without putting it into writing early on nobody here knows your mechanical expertise.
If you are not great around boat motors the best you will do is find a 15hp carb, change it out, and claim you turned the engine into a 15hp.
Your research into the other parts may be pointless since you have to remove the powerhead to change from an exhaust tube to a tuner. You have to remove the intake manifold then the reed blocks to install the additional spacer, if needed. That is where your research would come into play. some of the later years had these changes already just for commonality on the assembly lines. Am happy to tell you what needs to be done but I will not do all of your research into part numbers as well.
Not being mechanically inclined you may this may be a bit much.


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