 MPS tunning, Do my plugs seem to lean |
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| Ron914 |
 Mar 17 2026, 04:17 PM
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#1
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Member  Group: Members Posts: 488 Joined: 19-April 22 From: Huntington Beach,Ca Member No.: 26,487 Region Association: Southern California 
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I have a 2056 and was advised I should tune my MPS for optimum performance .
I rebuilt it with CFR diaphragm kit so I could dial it in . I have not tried to tune it yet and am wonder how my plugs look ? I have to richen the mixture on the ECU to run well (CW). I understand running lean will cause high heat , which could be part of my problem with high running temperatures . They look on the rich side to me . Plugs are in order 1-4 (#3) does not have the number on it.     |
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| worn |
Mar 17 2026, 04:22 PM
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#2
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Winner of the Utah Twisted Joint Award Group: Members Posts: 3,560 Joined: 3-June 11 From: Madison, WI and North Bend WA Member No.: 13,152 Region Association: Upper MidWest
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They look about right to me, but you may want to be richer than OK with a 2056. These days an A/F gauge is not that expensive and you can get a bung that clamps on so you do not have to weld. Then you can chase cylinder head temps for #3.
I talked to George Hussey several years ago and as I understood it he suggested that the CHT gauge would simply frighten me most of the time. Apparently you don't have to actually melt the aluminum to cause trouble. |
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| rjames |
Mar 17 2026, 04:42 PM
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#3
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I'm made of metal Group: Members Posts: 4,442 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest
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What Worn said. You'll need a wideband AFR kit to properly tun it.
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| Montreal914 |
Mar 17 2026, 05:24 PM
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#4
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Advanced Member Group: Members Posts: 2,060 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California
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QUOTE(Ron914 @ Mar 17 2026, 03:17 PM)  I have to richen the mixture on the ECU to run well (CW). If you are referring to the knob on the ECU, that is only for the idle and has no influence on normal driving (gets canceled). If I recall, there are no adjustments on the DJet ECU. |
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| FlacaProductions |
Mar 17 2026, 06:39 PM
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#5
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Advanced Member Group: Members Posts: 2,170 Joined: 24-November 17 From: LA Member No.: 21,628 Region Association: Southern California
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Re: MPS tuning - this will get you to post 12 of a good thread that you might want to scroll to the top of - but the chart shown there has helped me getting my head around MPS tuning. I do have a CHT under #3 and an AFR (which i resisted for a while but has proven really really handy for tuning...)
http://www.914world.com/bbs2/index.php?s=&...t&p=2963536 My AFR - bluetooth so you don't have to put another gauge in: https://pe-ltd.com/product/wideband/ |
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| emerygt350 |
Mar 17 2026, 06:55 PM
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#6
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Advanced Member Group: Members Posts: 3,477 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Ron, those look pretty good.
Besides the afr and cht and the plugs, just keeping track of mpg can tell you quite a bit too. |
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| brant |
Mar 17 2026, 07:17 PM
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#7
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914 Wizard Group: Members Posts: 12,161 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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You really have to use an AFR
Plugs are not sensitive enough to get it correct Plus you need to read wide open throttle for real safety of the ratio (and heads). So plugs won’t work |
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| Superhawk996 |
Mar 17 2026, 07:36 PM
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#8
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914 Guru Group: Members Posts: 7,747 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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The color of the ceramic electrode insulator is what matters.
Those look really good. |
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