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Old 05-02-2019, 09:43 AM   #11
RAMJET
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Re: Excessive exhaust residue


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I once ran a lawnboy lawnmower with no oil at all to see what would happen , well nothing happened after a full tank so I had to keep cutting the grass LOL. I'm sure it shaved some life off though . I fail to see how you guys feel you can just choose the mix you like and not pay a price . I agree better oil reduces wear but that does not mean you can use less of it. Oil is more then a lubricant,it need to be there in the amount they ask for to cushion,clean,cool ,seal,transfer heat. Ask DA they were advertising 100:1 for a while but after a million warranties they have now changed that to 40:1, it ran fine for 3 years though . Like I said before if the life span is acceptable with a leaner mix that's great but it doesn't mean that the right mix would not last longer. I have customers that come to my shop and tell me how they like to put thicker oil in there cars because it gets so much better oil pressure , LOL. The construction of the engine dictates the type and amount of oil required not the oil it's self . a liquid cooled 2 cycle is the only engine I can think of that designed for 100:1, and they only did that as a emission control measure ,not because it's good for the engine .,
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Old 05-02-2019, 10:53 AM   #12
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Re: Excessive exhaust residue

Wow lots of years of experience in this thread, pretty much all of it really good, I like the lawn boy story, my neighbor did that to mine, (really slobered after that) really if its dripping out the cowl and on the gear, you might have severe fuel stand off, that's the fog that develops in front of the intake from the compression/intake stroke on a 2 stroke, its part of the cycle, a velocity stack does help this trait. With as much as you say "its excessive" I think you are well enough versed in the running and setup of the engines and believe you. Perhaps a simple compression test to ensure its still up to snuff, as an incomplete burn from poor compression produces excessive residue from the exhaust, but from the cowl, you may have a defective or worn out reed valve causing the excessive fuel/oil (Pressure Pulses) out the carb, and worn rings/cylinder will overpressure the reeds (crankcase) rendering the same effect. All small equipment will have a felty type material in the air cleaner to absorb this trait, and inhale the residue as it can (different engine loads). But hey, give her the 100:1 with 10-30 and maybe Floyd will buy the parts. Keep us posted on what you find.
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Old 05-02-2019, 11:12 AM   #13
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Re: Excessive exhaust residue

One more thing, loose bearings will also cause poor front seal performance, look for drops of oil/fuel from the underside of the prop housing after running. We run 40 weed eaters and 15 chainsaws, every fall they get a compression check before storage, gives us an idea, how many are time X' ed and need replacing/overhaul before the horads of students arrive in the spring. A 2 stroke will run at 95-100 psi compression but is getting to the slobbery and undependable stage, 115-125 is still pretty good, 90-95 its time.
Compression test, (Both plugs out for a twin) Wide pen throttle 5-6 impulses on the tester should be enough, test both sides the same.

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Old 05-02-2019, 11:20 AM   #14
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Re: Excessive exhaust residue

If you do have a internal problem with your engine as suggested, I think you'll find out rather quickly as your performance should begin to drop off each time you fly. I would think the first issue would be a mixture change in the engine. And no, I don't deal in any gas plane engines and never will. Cheers Floyd
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Old 05-02-2019, 06:18 PM   #15
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Re: Excessive exhaust residue

Years ago when the 50:1 oil came out a fellow worker bragged about how much more power his 500cc dirt bike had when he used it. He told us he found some 100:1 oil that he was going to try on the weekend.

Monday morning saw him dragging his sorry butt into the shop, hardly able to walk and gravel rash on top of his gravel rash! Apparently the piston seized at 70mph on a dirt road!
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Old 05-02-2019, 07:30 PM   #16
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Re: Excessive exhaust residue

Most glow fuel makers only have 17% oil per jug. Most engine manufacturers recommend 20% oil in fuel. Other than PowerMaster 20/20 how many of us running glow engines increase the oil percentage up to the recommended amount?

I had a YZ 250 dirt bike and the mix was supposed to be 32:1. I switched it to 50:1 and it ran fine and didn't smoke as much. I beat that bike every time I had it out with no issues. It all depends on the quality of the oil you use.
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Old 05-02-2019, 09:41 PM   #17
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Re: Excessive exhaust residue

Of course Yamaha would have no idea what would be the best mix for a race bike LOL what a silly statement ,and they call for synthetic anyway so you are starving it . Funny I still have my 1998 YZ 125 running 32:1 since new, never rebuilt in 21 years , I live beside the trail and ride almost every day so I put on a ton of hrs , hardly makes any smoke at all @32:1 with good oil .I could run 50:1 too if I wanted to rebuild every few years but I ride so much I need it to last .
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Old 05-02-2019, 10:23 PM   #18
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Re: Excessive exhaust residue

Arnold how does the spark plug look. That should tell the tale of the engines running condition. Are you fouling any plugs? You can find lots of racing 2-stroke oils in both Castor and Synthetic and in a blend with some Castor.

Off subject. After I bought my YZ250 I realized how much I missed my YZ125. The 250 was way too powerful and spun the back wheel all the time. Plus in the bush I missed the 6 speed gear box that my 125 had. The 250 was a 5 speed and at slow speeds you were on the clutch all the time. Not to mention it was a pig on fuel. The 125 was lighter and was easier to handle. But like most I had to have bigger. Cheers Floyd
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Old 05-03-2019, 07:32 AM   #19
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Re: Excessive exhaust residue

Arnold how many gallons through it , all my engines slobber like crazy until they are broken in , my DLA 56 took 3 years to break in completely .. but now runs very clean .
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Old 05-03-2019, 08:45 AM   #20
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Re: Excessive exhaust residue

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Originally Posted by RAMJET View Post
Arnold how many gallons through it , all my engines slobber like crazy until they are broken in , my DLA 56 took 3 years to break in completely .. but now runs very clean .
Three years to break in! LOL It sure sounds like some thing was wrong with the engine, unless you only ran it a couple times per year. Your a patient man, I would've pitched it in the garbage. Cheers Floyd
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