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  1. #2551
    darryltarr's Avatar
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    RE: MOKI RADIAL Care and Maintenence

    Hello Herald,

    40:1 oil mix is just fine, I wouldn't change it. I have been using 40:1 from the beginning.

    However, I do need some more information from you:

    1. Your Biella Prop, what style is it exactly (Scale or 1-3B)
    2. Are you using an Electric Fuel Pump
    3. Are you using a Turbulator
    4. Where are you flying (Sea Level or at Altitude)
    5. What are the typical ambient conditions where you fly (Temperature and Humidity)
    6. What are you current Needle Settings (both High and Low)

    Please let me know and I will try to help.

    Darryl

  2. #2552

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    RE: MOKI RADIAL Care and Maintenence

    Thanks Darryl

    I change to 50:1 this weekend
    I am not sure about the Biella styte.. but i think is regular.
    I am not using turbulator or eletric pump
    My level here is 1900 feet, temperature this weekend was 68oF
    My needle is 1 3/4 high or a litle more and the low i need to check (using the default)
    With the Xoar 32x18 the Prop get almost 4600 but i am flying with 4250 rpm.
    The temperature after landing is almost 220/ 230oF in the upper cylinder.

    Heraldo

  3. #2553
    darryltarr's Avatar
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    RE: MOKI RADIAL Care and Maintenence

    Heraldo,

    Thanks for the information.

    1. The Density Altitude where you are flying is approximately 3000 feet, this means the air is thinner then the Standard Day Conditions at Sea Level. Therefore the default/factory Needle Settings will be on the RICH Side.

    2. Your High Needle setting should be very close to 1.75 Open

    3. Your Low Needle may be the issue and may be set too lean if you motor is getting HOT. A good starting point is 1.5 Open.

    4. Your Xoar 32x18. Is this a 2-Blade Prop or a 3-Blade Prop?

    5. On some of the Biela Props the first 4 inches of the propeller blade produce no cooling (a good example is the Fw 190 Scale Prop), as there is no airfoil section. However, It sounds like you ae NOT using such a prop.

    6. What OIL are you using. The best product is CASTROL Power 1 Racing 2T fully synthetic, followed by RED LINE.

    7. Since both of our flying conditions are similar there is no harm in a 40:1 oil mix (2.5%).

    Regards, Darryl


  4. #2554

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    RE: MOKI RADIAL Care and Maintenence

    Ok Darryl

    I will try to check the low needle, maybe this is the problem..
    My oil is Motul 800 (I think is one of the best oil available here in Brasil), I think more or less the same quality from yours.
    My xoar is 2 blade

    Do you think I can have problem with lean mixture because I don't have electric pump?

    regards

    Heraldo

  5. #2555

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    RE: MOKI RADIAL Care and Maintenence

    Question about the U20M-U plugs form Denso:

    Are users of this plug gapping at 0.015" or 0.025", or somewhere in between?

    I ask because the Denso website suggest different gaps depending on the small engine in which the plug is installed (and that's quite a range).

    Not surprisingly, Moki, DA and DLE were not listed among the small engine manufactures.

    I am going first with the smaller 0.015" gap, which should require less voltage for good full spark, but I thought I'd also seek some confirmation here.

    Thanks,

    Noah

  6. #2556

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    RE: MOKI RADIAL Care and Maintenence

    Nevermind, found the info (page 86 of this voluminous thread!)

  7. #2557

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    RE: MOKI RADIAL Care and Maintenence

    Hi guys,

    I am not a Moki owner but I am thinking I will be very soon!

    My friend at Siedel props and I are tinkering with this idea for the Moki 250 engine, have a look at our video and give us some feedback of what you think. He is performing the tests and makes his own props of course. This giant prop is still not enough to utilize all the torque, so he is moving on to the next prop design(dia will stay the same for a 1/4 Scale Corsair). This rough mounting was just to try the idea and now we will mount the gear set in a new front housing that would replace the original. The unit installed should only push the prop forward about .375"-.5"

    http://youtu.be/UZ1_KryCrGk

    Lots of details to work out, as its just the first test to see if the concept would even work....

    thanks very much!

    john

  8. #2558
    ram3500-RCU's Avatar
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    RE: MOKI RADIAL Care and Maintenence

    Is there any interest in OEM Moki ignitions? I have one new never mounted, and one very lightly used. I have gone to the new high energy units.

    thanks
    Gary
    Cheers,
    Gary P. / use Steel Powder for ballast not lead. PM me for more information.

  9. #2559

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    RE: MOKI RADIAL Care and Maintenence

    I have the same offer as Gary for a used ignition for the 150cc!

    PM me.

    Noah

  10. #2560

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    RE: MOKI RADIAL Care and Maintenence

    Who sells the new ignition for the 250?
    Time flies like a brick thru the window of life.

  11. #2561

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    RE: MOKI RADIAL Care and Maintenence

    Darryl

    I did more tests with the moki.
    The low needle was open to 1 1/2 and high had to be close a litle to 1 5/8 more or less.
    the engine is with more or less 4500 with the Xoar 32x18
    The temperature was the same.. after landing 220/ 240oF
    I did 4 flight and the engine is perfect.. but my point..

    The strange think.. i can't see the carb, so i set up the servo until reach the max point with ATV 86%. But this RPM i get with 3 clicks dow in the trotle. So i dow the ATV to 66%. With full power the RPM drop 300 rpm.
    i will need a mirror to check if the carb is full open but i never see a gas carb doing that.. what do you think? another idea is that the engine can't have all the fuel that need to full open carb so in this point is stronger than full open..

    heraldo

  12. #2562
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    RE: MOKI RADIAL Care and Maintenence

    My 150 does the same thing, and I've heard from others who also experience an RPM drop when the carb is at full throttle.

    There could be a couple of explainations:

    It could be perfectly normal, or,

    The carb may not be able to deliver enough fuel to accomodate the amount of air coming in at full throttle.

    If "not enough fuel" is the issue, that would explain why people are experiencing better results with teh external fuel pump. I purchased one of those pumps, but have not installed it yet.
    Waco Brotherhood # 153

  13. #2563

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    RE: MOKI RADIAL Care and Maintenence

    If you are getting 220 to 240 degrees F after flight, I strongly suspect that you have cooling issues / are running too lean. I was told that anything above 220 degrees F is overheating.

    I'm not an expert, just passing on what I've been told.

    I had what we believe was overheating issues on one of my 150s and better cooling, getting temps down to 210 F max has greatly improved its running, though I also experience that a 3/4 to 7/8 throttle position sometimes gives a better run.

    Whit

    ORIGINAL: heraldoboldrin

    Darryl

    I did more tests with the moki.
    The low needle was open to 1 1/2 and high had to be close a litle to 1 5/8 more or less.
    the engine is with more or less 4500 with the Xoar 32x18
    The temperature was the same.. after landing 220/ 240oF
    I did 4 flight and the engine is perfect.. but my point..

    The strange think.. i can't see the carb, so i set up the servo until reach the max point with ATV 86%. But this RPM i get with 3 clicks dow in the trotle. So i dow the ATV to 66%. With full power the RPM drop 300 rpm.
    i will need a mirror to check if the carb is full open but i never see a gas carb doing that.. what do you think? another idea is that the engine can't have all the fuel that need to full open carb so in this point is stronger than full open..

    heraldo

  14. #2564
    ram3500-RCU's Avatar
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    RE: MOKI RADIAL Care and Maintenence

    Hey guys, here is a link to my ad for the ignitions I have for sale.

    http://www.rcuniverse.com/market/ite...665&electric=0
    Cheers,
    Gary P. / use Steel Powder for ballast not lead. PM me for more information.

  15. #2565

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    RE: MOKI RADIAL Care and Maintenence

    what size tubes are you using in the moki 250?

  16. #2566

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    RE: MOKI RADIAL Care and Maintenence

    guys I am doing some tests with my moki S7 250.
    I confirm that the engine is strong with more or less 85/90% of the carb open. when to the full open the engine drop almost 300 RPM.
    Some people are saying that an electric pump will solve because the engine can get enough fuel. Question... if is true open the high needle will solve that. And won't..

    anybody has an idea Hwy that?

  17. #2567

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    RE: MOKI RADIAL Care and Maintenence

    Heraldo, you must read the whole thread. Almost all your question will be answered(takes some time....)

    Regarding your request: A moki shall NEVER have full throttle opening. Do like this: Open throttle until rpm stops increasing. Mechanicly adjust servo travel to the same throttle opening. Apply expo until you get a smooth increase of rpm over the whole stick movement and you will also get the best stick resolution. With 60/70 % throttle opening,there is nothing more to gain from the Moki.


    /Straightleg

  18. #2568

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    RE: MOKI RADIAL Care and Maintenence


    ORIGINAL: john534

    Hi guys,

    I am not a Moki owner but I am thinking I will be very soon!

    *My friend at Siedel props and I are tinkering with this idea for the Moki 250 engine, have a look at our video and give us some feedback of what you think. He is performing the tests and makes his own props of course. This giant prop is still not enough to utilize all the torque, so he is moving on to the next prop design(dia will stay the same for a 1/4 Scale Corsair). This rough mounting was just to try the idea and now we will mount the gear set in a new front housing that would replace the original.* The unit installed should only push the prop forward about .375''-.5''

    http://youtu.be/UZ1_KryCrGk

    Lots of details to work out, as its just the first test to see if the concept would even work....

    thanks very much!

    john

    Nice!!! great to see that finally in the modelling world we are starting to think about using gear reduction on our motors to better match the full sized counterpart. Is the planetary gearbox you are using for the test an off the shelf unit? would be great to bolt that onto a dle55 for smaller warbirds!

    Thanks

    dave

  19. #2569

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    RE: MOKI RADIAL Care and Maintenence

    Sorry I did not start at the top of the thread, is there information here about any advantage the new velocity stacks offer, for an older Moki 250?

  20. #2570

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    RE: MOKI RADIAL Care and Maintenence

    Sorry I did not start at the top of the thread, is there information here about any advantage the new velocity stacks offer, for an older Moki 250?

  21. #2571

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    RE: MOKI RADIAL Care and Maintenence

    Does anyone have a video showing the adjustment of the valve gaps? I have just finished doing mine (thanks to both Gotz Vogelsang and Mitch E ( Nine o Nine) for their patience in advising me on the process. I would enjoy / benefit from seeing a video on it, see if I followed their advise correctly. Seems simple but the Devil is in the details.

    Whit

  22. #2572

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    RE: MOKI RADIAL Care and Maintenence


    ORIGINAL: Moki4Ever

    Sorry I did not start at the top of the thread, is there information here about any advantage the new velocity stacks offer, for an older Moki 250?
    Yes there is a test with a TBM velocity stack

    http://www.rcuniverse.com/forum/fb.asp?m=11450559


  23. #2573

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    RE: MOKI RADIAL Care and Maintenence

    Oh thanks I believe this is the unit I saw at Frank Tiano's event 2 years ago.

  24. #2574

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    RE: MOKI RADIAL Care and Maintenence

    in my moki 215 I use mobil1 oil and low octane gas and it runs powerful and perfect.
    on this engine, low octane means more power.

  25. #2575
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    RE: MOKI RADIAL Care and Maintenence

    I need a prop suggestion for my Moki 150....

    I'm flying a 35% Pilot Yak, about 32 pounds (if I remember) and a 107" wingspan. I've tried a 26x14 and a 26x16, both of which just don't seem to give me much torque or speed. I thought that since the plane was relatively light for the motor, it could handle the extra pitch. Maybe not. If I do typical warbird bombing runs, it builds up a good head of speed, but looses it quickly on the upline. The motor turns over 5000 RPM on the ground with either prop, and I hate to step down too far in pitch... need to keep the ground RPM's around 5000.

    Someone suggested a 28x14.... there's plenty of room for ground clearance. I hate to keep throwing money at props that aren't performing for me... any suggestions that will improve torque and still have decent speed from the plane? I don't 3D at all, just basic aerobatics, sport flying.
    Waco Brotherhood # 153


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