Hello ,

I just got a brand new evolution 26gt2 and have ran a tank of fuel through it ! The engine will run for about 10 minutes and then stall and the plug will be fouled !! I have read here that people just run them on the regular gas/oil mixture and just run them a little rich !! I was running it at the break in level of gas and oil and am having problems !! Just wondering if I should run the 40/1 with it a little rich in stead of the break in mixture so I don't foul as many plugs ??? I've gone through 4 plugs and can't see nothing wrong with engine but the plugs are a little black from the oil !! I have tried to lean it up and still no change !!Could some one please help????


Thanks,Josh

What oil are you using? I have the same engine and I am using the oil recommended by the Mfg.. I have run 3- 16 ounce tanks and do not have any problems with fouling. so it is possible that you may have to change brands of oil.

I'm running royal purple . What oil is recommended by the mfg??

Thanks for the reply!!!

Mobil 2t racing is recommended oil by mfg.

Fouled plugs come from rich tuning, not the oil mix. This isn't a glow engine, don't run it overly rich.
James

You say you have tried to lean it up ... can you expand on that? What is the method you are using to tune your engine?

Are you letting it idle for 10 mins to get a fouled plug?

Apart from running the wrong oil, which will void your warranty, you run the engine way too rich!
The engine NEEDS fully synthetic racing two stroke oil, and a tune just slightly on the rich side of best power. (on the verge of loosing rpm rich)
RPM should be at least 8000 with plane stationary, adjust prop load if needed.

Well Royal Purple is a FULL synthetic race oil !!!!!!!!!!!!!![8D]

I don't think so.
They have at least two kinds of oil, both TCW, which is not recommended by MVVS. The "synthetic solvency" part is rather undefined. I quote from their specs both the two stroke and two stroke racing oils:

2-Cycle TCW III is a high performance engine oil that improves performance and dramatically reduces wear in two-cycle gasoline engines. It’s recommended for use in both pre-mixed and oil injected gasoline two-cycle engines in outboard motors, motorcycles, jet skis, chain saws, etc.
Its synthetic solvency keeps spark plugs and exhaust ports clean as well. Its performance advantages come from a blend of synthetic oils

Royal Purple 2-Cycle TCW III Racing has a synthetic solvency that keeps spark plugs and exhaust ports clean for maximum engine efficiency. This engine cleanliness, combined with 2-Cycle TCW III Racing’s low coefficient of friction promotes increased horsepower and engine speed.

Low voltage on ignition?

I believe this ignition needs a 6 cell battery pack.

No OEM can legally void your warranty for running "the wrong" oil. If the oil used at the point of failure is of the same quality as specified by the OEM they have to honor the warranty as stated. Brands specific warranty denial is not possible in the US. A manufacturer can threaten it but it wont hold up. Trust me I have been there.

103/17

I have two of these motors and use Amsoil at 100:1 mix all year long and they just keep on humming. If you have modified the choke lever in any way make sure you verified it stays in the open position during flight. Thats what happend to me, kept getting richer and richer but yet when I landed the choke was wide open. Air pressure was closing the choke during flight. If all else fails send it back to Horizon, they have great customer service. Thanks, Jerry.

According to the Magnuson-Moss act, if there is a brand specific oil for warranty, It must be supplied at no cost with the product itself.. Thats the law in the U S of A.

Yes you are right. 100% correct statement....................

You still need a full synth oil or void warranty. Agreed? Reason for this is the graphite coated piston.

Is that why MVVS supplies the oil with their new 45 and 58 engines?
Lets face it. Oil is extremely important, and not just any oil will do.
However, it is not the subject of this thread. 4 plugs were wasted, all black and fouled. This is not an oil issue, and also not an oil ratio mix issue, it is an issue of running the engine way too rich!
I have been racing on 5 - 6% oil in the mix and still had nice brown plugs if the engine got a fighting chance to warm up before the cold racing plug fouled.
Spoiling so many plugs in sequence just means that the mixture is, or gets way too rich for whatever reason. To name a few:
1) idle and/or main needle opened too much. Needles must be adjusted correctly by the user!!!!!!
2) choke valve closing in flight like mentioned before?
3) CARB MAIN NEEDLE inside the carb not closing properly
4) if air filter, if used: clogged filter
5) to much pressure on carb regulating membrane (cowl/carb issue), reference pressure item.

Pe covered all the possible causes of your problem. I would start at #1 and work down.

what is your recommendation for needle settings for cold weather that is 34 degrees F. I have been running the royal purple in my 2 stroke dirt bike and four wheeler and they have been running rich with out touching them at all !! I'm just wondering if this oil is extra rich the way its made . My dirt bike runs rely rich when run the same mixture as I ran with the old oil which was spectro 2 cycle oil !! The four wheeler is oil injected . The problems didn't start till i switched oils !! I called horizon and they told me to run a ashless oil !! Like lawn boy or penzoil outdoor. Also one more question I have heard the mvvs engines you run premium gas ,I was told by horizon to run regular could this be causing the problems ?? It just says in the book a quality gas dose this mean premium??

Thanks in advance !!

Josh

If you have a coated piston it is usually to aid in break-in and in my experience has nothing to do with the oil type . There are quite a few "coatings" used today. Synthetic or petroleum should make no difference? Unless the OEM supplies you with oil to use, they can not tell you that they will void your warranty because you used the wrong oil. If they give you oil then tell you if its not used it will void the warranty they have ground to stand on. Now....... if you decide to use brake fluid when they recommend a "good quality" 2 stroke oil in their manual you may have a problem. I will also say that if an OEM asks for a failed part for testing and you used something that you shouldnt have used ( like brake fluid ) they will find it, we always did. Just be honest and follow the guidelines and, Oh yea, deal with a reputable manufucturer. In the end they want you to be happy so they will make most problems right. If they dont then you shouldnt do business with them.

103/17

Premium gas burns slower and could cause it to feel rich but it would have to be a big jump in octane. I am talking about 114 octane VP in a stock engine built to run 87. This would cause a reduction in power, a reduction in measured plug tip temperature which could in turn lead to fouling. If plug tip temps go much below 700 F the plug starts to have problems .Going from 87 to 93 would not be an issue but running the lowest octane possible will give the best performance contrary to popular belief. Ashless oil is always the best to run. Why oils with ash are still being made today is a mystery to me. There is no need of it. TCW although an outdated ancient ratinging system is really all you have to go by. TCW 3 oils are all pretty good, heck even the TCW 2 stuff is perfectly acceptable. We are not dealing with high HP engines. If we were our 50cc engines would run about 10HP. Thats following the warranty guidelines we used to have of 20 hp per 100cc's in order to qualify for warranty coverage by our engine supplier. We are all using low HP engines in our aircraft.

103/17

MVVS prescribes Mobil 1 2T or equivalent all synthetic racing oil
They also prescribe 95RON octane fuel or better.
Their engines need that.
103/17, if you know better, so be it. I think you just posted a lot of it, not to be used as sound advice for the engine subject in this thread.

Well Sir, I guess we all have opinions. You have just stated yours. Nothing that I posted is bad information. Everything that I posted is factual. Everything that I posted is common knowledge for any 1st year engineering student. Its not very complex............ I am sorry that you dont agree.

103/17

I am confident that when You finish the first year engineering school, and get some more education under your belt you will feel quite a bit different.

The key to your argument is BRAND specific. The manufacturer may specify a TYPE of oil and if not used MAY void the warranty. I am curious how many folks offering legal advice in this thread would be "Attorney's Qualified in this particular area of the law". I know some are engineers, are there any lawyers among us?

I love "qualified" answers--which exclude actual use of the product. They miss the key point -
Experience with the product.
As for lawyers -
That should help----
if the lawyer has a background (actual experience) in applications of oils -with THIS particular engine .
FWIW I have had a few of the MVVS/ Evolutions -which came with the recommended oils and that is what I used -and even with the thrashing I gave em - they continue to run well - no additional bearing clearnce (how do I know?) -easy you record and compare prop movement at TDC hot n cold and th pistons are smoothly polished in viewing occasionally when changing to another model.
The factory advice has proven to me , to be spot on.