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Decarbon engine? Important for 2 and 4 strokes. #14263 08/20/13 12:37 AM
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Craig Offline OP
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Any of you do this regularly? I have been reading a lot of performance stuff lately over on scream and fly and someone recommended that you decarbon your motor every 100 hrs or so. I called the dealer to confirm and the said it is important to get the optimal preformance out of your motor. I used evinrude tuner tonight. You spray it equally into the throttle bodies at 1200 rpms until the can is empty then let it sit for 16 hrs. Then run it at 1500 rpms for 15 minutes. I hope I get to run it tomorrow to see this stuff work. When I was almost done with the can the motor started smoking like crazy so I am hoping it really works. They say it will smoke like a freight train when you start it back up for about 10-15 minutes and that is the carbon burning off. Some people report a gain of 3-450 rpms after doing this. I will report back after I run it tomorrow.

Last edited by Craig; 08/20/13 01:00 AM.
Re: Decarbon engine? Important for 2 and 4 strokes. [Re: Craig] #14265 08/20/13 02:46 AM
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FishermanFrank Offline
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Sounds interesting.
Can't wait to hear what happens.


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Re: Decarbon engine? Important for 2 and 4 strokes. [Re: Craig] #14268 08/20/13 01:18 PM
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pbmang Offline
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I've done mine a few times and it seems to help some. I should probably do it again soon. I know my neighbors usually come over and make sure the house isn't on fire.


Re: Decarbon engine? Important for 2 and 4 strokes. [Re: pbmang] #14269 08/20/13 01:58 PM
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I haven't done mine in 2-3 years, reckon I should though. I use 92-93 octane and Stabile. Not sure if that helps minimize the carbon build up though.


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Re: Decarbon engine? Important for 2 and 4 strokes. [Re: Craig] #14271 08/20/13 03:45 PM
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Craig Offline OP
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Bob everything I read says it does not matter the octane fuel you use or the type of oil. All motors will get carbon build up on the pistons and need to have this done. they say sometimes you have to do it twice to get it really clean. As easy as it is to do I don't see why you would not do it. I plan on making it part of my regular yearly maintenance. Plugs, impeller, foot oil and now decarbon.

Re: Decarbon engine? Important for 2 and 4 strokes. [Re: Craig] #14272 08/20/13 05:26 PM
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pbmang Offline
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It is my understanding that the lower octane fuel will cause less carbon because more fuel will be burned. I know in my motor Yamaha recommends running the low octane fuel just for that reason. Some motors need the higher octane because of the compression, but mine loves the cheap stuff.

Last edited by pbmang; 08/20/13 05:26 PM.

Re: Decarbon engine? Important for 2 and 4 strokes. [Re: pbmang] #14273 08/20/13 08:16 PM
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Craig Offline OP
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mine calls for low octane also but I only run non ethanol and can only find it in 90.

Re: Decarbon engine? Important for 2 and 4 strokes. [Re: Craig] #14274 08/21/13 01:09 AM
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FishermanFrank Offline
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So I'm guessing everything went ok when you went out?


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Re: Decarbon engine? Important for 2 and 4 strokes. [Re: Craig] #14280 08/21/13 12:20 PM
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I was using 91 octane in my Optimax....my dealer told me (and I have since confirmed) that the higher Octane contributes to carbon build-up. For my Yamaha I use 89...which is what the MFG says to use. I also put yamalube in the tank each time I put gas-in...the additive has a cleaning agent to help reduce carbon build-up.

I wish the Ethanol stuff would just go away!

Re: Decarbon engine? Important for 2 and 4 strokes. [Re: Tom Cox] #14282 08/21/13 12:36 PM
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Wow, I didn't know that. I was always led to believe that the higher the octane the higher the temperature and the lower the carbon build up. I am going to call Paul Nichols up in Soddy Daisy and get his reading on this topic. He and his cousin are a couple of the best machinist and engine rebuild specialist in the business. Paul is also a test driver for Mercury and for Yamaha. I will let you guys know what he says.


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Re: Decarbon engine? Important for 2 and 4 strokes. [Re: Craig] #14291 08/21/13 02:57 PM
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The only things that will really determine what octane you need are going to be your compression and timing. Some motors are designed for the higher octane fuels, like the ProXS. If you run a higher octane than what your motor is designed for, you are going to have more unburned fuel each time your spark plug fires, versus if you were running the suggested octane. I believe that will actually lead to more carbon build up and a bigger than necessary hole in your wallet.

Last edited by pbmang; 08/21/13 02:57 PM.

Re: Decarbon engine? Important for 2 and 4 strokes. [Re: pbmang] #14294 08/21/13 04:27 PM
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Went and tested it yesterday and it smoked like crazy for about 5 min. I did pick up 200 rpms but I was trying a new prop at the same time. I have to say my boat is running good.

Re: Decarbon engine? Important for 2 and 4 strokes. [Re: pbmang] #14295 08/21/13 04:42 PM
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Tom Cox Offline
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Originally Posted by pbmang
The only things that will really determine what octane you need are going to be your compression and timing. Some motors are designed for the higher octane fuels, like the ProXS. If you run a higher octane than what your motor is designed for, you are going to have more unburned fuel each time your spark plug fires, versus if you were running the suggested octane. I believe that will actually lead to more carbon build up and a bigger than necessary hole in your wallet.


Agree...I think the key is using the octane rated for the engine.

Re: Decarbon engine? Important for 2 and 4 strokes. [Re: Tom Cox] #14298 08/21/13 04:52 PM
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Mine is 1997 model Mariner 200 Mag EFI, I reckon I need to do some digging to see what is recommended.


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