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Old 05-28-2016, 05:35 PM   #11
bbbair
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Re: DA50R Over Heating


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WE HAVE SUCCESS!


All of those who suggested a partial blockage of the carb are/were correct!

I took apart the carb and found that the filter screen was coated with a fine layer of ‘DUST’ (? I don’t know what it was).

But it acted like an ultra fine filter that allowed some fuel to pass and under the demands of high power it leaned the engine out to the point that it over heated.

I bought a Carb kit and Carb cleaner, then followed along with a Youtube presentation and then put it all back together – I just ran two tanks of gas through it at High speed (7.1K) on the ground with no problems!

FYI – I checked my inline fuel filter – it also had the ‘Dust’ in it… that filter got cleaned as well!

It is the ‘Little’ things that make or break this hobby… now I’m going to take a look at the rest of my gas engines to see if they need a cleaning too!

Thanks for the help guys!
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Last edited by bbbair; 05-28-2016 at 10:44 PM.
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Old 07-12-2016, 07:23 PM   #12
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Re: DA50R Over Heating

You mentioned crashing your plane, With all the inertia going forward, Perhaps
the clunk (fuel pick up) in your tank is lodged at the front end .
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Old 07-12-2016, 08:41 PM   #13
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Re: DA50R Over Heating

I chased my tail around on a little DLE 30 once and it ended up being the batteries for the ignition. I to thought it was getting hot, run for a bit, start acting up, then it would quit.

Just a thought.....
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Old 07-13-2016, 05:55 PM   #14
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Re: DA50R Over Heating

I now have a dozen flights on the Extra since my Carb repairs - NO PROBLEMS!

That little bit of 'Lint' in the Carb filter was the culprit!
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Old 07-14-2016, 01:23 PM   #15
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Re: DA50R Over Heating

Your 32 to 1 mixture is too much oil. Too much oil will make the engine run leaner and hotter. Your best to follow the engine manufacturers specs on oil mixture. Adding extra oil to a two-Stroke engine does more harm than good.

Here's what DA says about the oil;
Some oils, and their mix ratios, that Desert Aircraft recommends are: Red-line Two Stroke Racing Oil (40 to 1), Motul 800 (50 to 1), and Stihl HP Ultra (50 to 1). These oils can be found at most motorcycle or chainsaw shops.

Cheers Floyd
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Old 07-14-2016, 08:13 PM   #16
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Re: DA50R Over Heating

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Originally Posted by floyd View Post
Your 32 to 1 mixture is too much oil. Too much oil will make the engine run leaner and hotter. Your best to follow the engine manufacturers specs on oil mixture. Adding extra oil to a two-Stroke engine does more harm than good.

Here's what DA says about the oil;
Some oils, and their mix ratios, that Desert Aircraft recommends are: Red-line Two Stroke Racing Oil (40 to 1), Motul 800 (50 to 1), and Stihl HP Ultra (50 to 1). These oils can be found at most motorcycle or chainsaw shops.

Cheers Floyd
Gee Floyd...

I appreciate the concern but I don't think that excessive oil is going to hurt an engine,

I contacted DA about the situation and here is what they had to say;


"Our preferred oil is Redline Racing oil mixed at 40-1. Itís the cleanest burning oil we have come across. Bearing life is great and cylinder temps are very low.
It sounds like your oil and mix ratio is working OK, but itís hard to say without seeing inside. Areas of concern would be carbon build up on the cylinder head and piston crown, build up in the ring groove that could stick the ring and piston and bearing wear. You got 4 years out of it so far, so it could obviously be worse!! If you want to clean it out a bit, you might try the Redline at some point."


32:1 or 40:1 ... I don't really see that as a major difference and I am not experiencing any problems, but thanks for your concerns.
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Old 07-14-2016, 08:54 PM   #17
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Re: DA50R Over Heating

I have been running 32:1 with premium gas for last few years and never had a issue. ZDZ recommends that so I went with it. I also use the same mixture on My DA100, DLE56, DLE35 and DL30 without any issues. If I had to mix gas/oil engine for each engine, that would be inconvenient. At the end of the flying season I use the left over mixed gas in my snowblower and it works fine.
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Old 07-14-2016, 09:09 PM   #18
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Re: DA50R Over Heating

Rob
I break my DA's in on 32-1 dino. Then switch to Redline 40-1. I did find the 32-1 will carbon up the ring a bit but a few gallons seems fine. The Redline afterwards does clean the internals up quite nicely. The little screen in my carbs had a yellow sticky substance stuck on them. Turn out it was the fuel tubing breaking down. I had to use thinners to get it off.
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Old 07-14-2016, 09:34 PM   #19
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Re: DA50R Over Heating

Think about a 32:1 and 40:1 oil mixture. If the carb jets are set for a 40:1 mixture and you run a 32:1 mixture, your getting less gas and more oil which is a leaner mixture and will make the engine run hotter. That's why you should follow the engine manufacturers recommendation at all times. Here" a link below to adding too much oil. Cheers Floyd

The motor is designed to operate at this ratio. in any motor, 2 or 4 stroke, lessoning the fuel will cause lean burn. even though oil burns, it is in 2 strokes as a lubricant, not a fuel. you may increase the oil to fuel ratio, but not too much.

Last edited by floyd; 07-14-2016 at 09:40 PM.
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Old 07-14-2016, 09:46 PM   #20
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Re: DA50R Over Heating

More oil is always better to a point. more oil in a gas/oil mixture will let the engine run cooler because the oil is providing less friction which results in the engine running cooler. the difference in 32:1 and 40:1 is negligible but I will always go with more oil.

I remember a few years ago everyone was using amsoil 100:1, It didn't last as it proved out in the long run not to work

And mixture adjustments on the carb has nothing to do with oil content.
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