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  Fuel, oil, air, mixture

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Author Topic:   Fuel, oil, air, mixture
NewportMe posted 05-10-2004 01:59 PM ET (US)   Profile for NewportMe   Send Email to NewportMe  
I have a 6 horse kicker on my newport. This motor is at idle all day. The plugs havn't fouled but are black. can I mix the gas with a little less oil without harm? Or should I lean the idle fuel setting on the carb? Or just carry plugs and troll away.
Sal DiMercurio posted 05-10-2004 02:10 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
If your only going to troll with it at just over idle rpms, you can get away with less oil, but do "NOT" run her hard on any mix that's less the 50.1
Most engines only need 100.1 or less at idle, but you will fry the engine if you run her over 1/4 throttle on that lean of a mix.
Do not lean her out on the carb.
Sal
Salmon Tub posted 05-10-2004 02:26 PM ET (US)     Profile for Salmon Tub  Send Email to Salmon Tub     
Look at my post on "can you read" for a guide on reading plugs. If you troll with the kicker in idle, how fast does it push the Newport?
Bigshot posted 05-10-2004 02:34 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
If you have an air compressor, buy a spark plug cleaning kit for $10 at harbor freight. It sand blasts them in a couple seconds. With plugs being $2 each and only needing 2, I would leave be, run it WOT for a minute before shutting her down and carry an extra set of plugs.
NewportMe posted 05-10-2004 03:25 PM ET (US)     Profile for NewportMe  Send Email to NewportMe     
Thanks all I may mix it a little lean and will not touch the carb. I have no precise means of measuring speed (we judge by the rod tips) but I would guess 2 MPH. The cold water in Maine must slow down the fish;)
Bigshot posted 05-10-2004 04:03 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Actually your engine "should" run fine at 100:1 even at WOT. OMC and others did this in late 80's early 90's and most of them are still going strong today. Reason why they went back to 50:1 is they were having rod bearing problems with surface rust. The lower ratio did not coat the crank enough with oil and when they sat(esp. on salt water) they could corrode internally. If you run it 75:1 it will be fine, especially at low speeds but I doubt it will do much for the plugs. Again I would just run it WOT for 30 seconds/minute to clear it out every time you head in. I do this with all my 2 strokes. My neighbors must think I drive like an idiot because I usually come in our channel at WOT and then pull her back to idle.
JBCornwell posted 05-10-2004 06:11 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Take all of these recommendations in light of the fact that none of us know what flavor 6hp you are talking about, Newport.

If it is air cooled none of the above apply. If it is a Johnson series CD, none of the above apply. If it is a recent Yamaha, none of the above apply. ETC.

Tell us exactly what engine you have and we may be able to make plug, mix and tuning recommendations that are valid.

Red sky at night. . .
JB

NewportMe posted 05-12-2004 06:14 AM ET (US)     Profile for NewportMe  Send Email to NewportMe     
J.B. In my haste I left out valuable details I'm sorry. Here are the numbers Johnson 6 hp mod#j6rleia ser#bg8837751 I picked this motor up used so I dont have a lot of info. It runs great and I have had no problems I just dont want to create any ( carbon build up, fouling plugs etc.)
Thanks Newport
NewportMe posted 05-12-2004 06:14 AM ET (US)     Profile for NewportMe  Send Email to NewportMe     
J.B. In my haste I left out valuable details I'm sorry. Here are the numbers Johnson 6 hp mod#j6rleia ser#bg8837751 I picked this motor up used so I dont have a lot of info. It runs great and I have had no problems I just dont want to create any ( carbon build up, fouling plugs etc.)
Thanks Newport
JBCornwell posted 05-12-2004 08:47 AM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Thanks, Newport.

Your engine is a 1991.

For extended and mostly low speed operation you can reduce risk of fouling by any of the following.

Switch to Champion ---J6C plugs (if they are not already in there), increase plug gap to .040 or use a leaner mix with synthetic oil.

Amsoil makes an oil specifically for running 100:1 mix that is TC-W3 rated, but it is hard to find. Pennzoil 100% synthetic is probably okay for a lean mix, too, but I wouldn't promise that 100:1 would be safe.

If you do run a leaner mix through the season, use a 50:1 mix in your last tank of the season to ensure a good coat of oil on the internals when you put her up for winter.

Good luck.

Red sky at night. . .
JB

NewportMe posted 05-26-2004 07:44 AM ET (US)     Profile for NewportMe  Send Email to NewportMe     
Thank you all I just returned from a 4 day trip. I mixed synthetic oil at 75:1 used the reccomended plugs (thanks J B) The motor ran perfectly, less smoke, never hiccupped in 4 days at idle. thanks again Bruce

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