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  1. #1

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    JBA engines, good or bad.

    Hi.

    I just ordered one JBA 120 AR and one JBA 61 A.
    Any information on these engines?

    Hope they a good, atleast the price was unbeatable.

    Thanks.

  2. #2
    Moderator w8ye's Avatar
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    RE: JBA engines, good or bad.

    There's been some talk about them the last few years

    There have been a couple carb problems early on but most people like them

    Enjoy
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
    Club Saito Member #7
    Original AMA #31261

  3. #3
    Turk1's Avatar
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    RE: JBA engines, good or bad.

    I am using F type JBA 56.They have a different(heli type) carb.Im happy with them.Engineering is good.No debris inside.Where did you buy them?
    GlowHead Brotherhood #31

  4. #4
    bigedmustafa's Avatar
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    RE: JBA engines, good or bad.

    http://www.rcuniverse.com/forum/fb.a...762745&key=JBA

    They both started by hand in usually 1 flip. The only time I used a starter was when I was doing the rpm runs and ran short runs to tune for max rpm, then shot down and changed props. The engine never got a chance to really cool down. I bumped it with a starter and it went right off.

    To tell you the truth, I have looked for a down side and haven't found one. It just starts up, runs good and keeps on running. And it will definitely out turn any .46 out there. Maybe not a Jett on a small 10-6 prop, but probably would on a big one."

    Ed (Moorman)
    I only own one JBA .56, but it's been a pleasure to own and fly so far.
    Electric RC planes are like non-alcoholic beer, they are OK in a pinch if the real thing is not available.

  5. #5

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    RE: JBA engines, good or bad.

    Got my engines today, will pick them up at the post office and head home soon.
    I will start run in on the 120 today, I have to make a new batch of 80/20 fuel first.
    After some running time I will report to you all.
    I will save my 61 to a rainy day

    Turk I bought them here in Sweden, paid $240 for both including shipping

    Take care.

  6. #6

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    RE: JBA engines, good or bad.

    Now I'm done for to night.
    I have now run 3 420cc tanks of fuel in my new 120 AR

    It started on the first flip, had to adjust the carb pretty much, not set up from the factory.
    I used a Graupner 15/8 and 80/20 methanol/castor.
    First tank was a rich 5000 rpm run and it took for ever, so it's not hard on fuel.
    I then filled it up and leaned both low speed and high speed needles and I got a 2500 rpm idle and a 7500 rpm wot.
    So I thought that sounded week so I read the instruction and saw that idle should be 2500 rpm but wot 8700 rpm.
    And it said to use 10% nitro, I don't like nitro in a sunday flyer so I took the head of and found 2 shims, I took both out and tried again.
    Now I get a steady 2300 rpm and 8500 rpm wot wich I'm verry happy with.
    I used the JBA plug that I got with the engine.

    Conclusion.

    It's a real good engine, solid nice fit and I would easy recomend it to any one.

    On Sunday I will do flight test, and the engine is in a big Super Chipmunk mounted inverted.

    Take care.

  7. #7

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    RE: JBA engines, good or bad.

    Hello-

    I am DeWayne of knoxHobbies and We now are stocking and selling the JBA line in the USA.. We stock all engines including the "f" series + car and heli versions and will be glad to support all customers..

    DeWayne
    DeWayne Solomon
    sales@knoxhobbies.com

  8. #8

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    RE: JBA engines, good or bad.

    Have a JBA 120 on a Krill, Velox Revolution II. Starts on the first back flip, even when hot. Had to do some tinkering with the carb settings but this thing hauls the freight. Very good engine.

  9. #9
    Moderator j.duncker's Avatar
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    RE: JBA engines, good or bad.

    Zombie thread alert!
    The dreamers of the day are dangerous men, for they may act their dreams with open eyes, to make it possible.

  10. #10
    bigedmustafa's Avatar
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    RE: JBA engines, good or bad.

    That's OK, I've purchased another JBA .56 2-stroke since posting here, and it was as reliable and as friendly as the first. JBA engines are a real hidden gem!
    Electric RC planes are like non-alcoholic beer, they are OK in a pinch if the real thing is not available.

  11. #11
    Ed_Moorman's Avatar
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    RE: JBA engines, good or bad.

    I broke in and test flew BigEd's first JBA .56. I was writing for R/C Report at the time and live in Florida, whereas it was winter in Omaha where he lives. It is one good running engine. As soon as I sent it back to him, I ordered my own.

    I did a bench test of the JBA and compared it to the OS .55AX. Let me see if I can find those rpm figures. I didn't try that many props, just what I had handy. Fuel was Omega 10% castor blend. Temp was 65-70 deg. RPMs in thousands.
    OS .55AX JBA .56
    10-6 15.7 -
    11.5 14.0 -
    11-6 12.8 11-6APC 12.8 11-6MA
    11.7 12.2 11-7APC 12.4
    11-8 RevUp 11.3
    12-6MA 11.6
    12-7APC 10.8
    12.25-3.75PAC 13.0

    I have never had a bit of trouble with the carb.

    I tried the JBA muffler, a Tower .46 muffler and the OS .55 muffler on the JBA. The JBA stock muffler was 400 rpm faster that either of those.

    The OS responds to a tuned muffler (Jett or Ultra Thrust) very well. 1700 rpm of the 11-6 and 1500 rpm of the 11-7. The OS is port timed better for tuning.

    The JBA gets a moderate boost from a Jett. 11-6A 1000, 11-7A 1200, 11-6MA 700, 12-6MA 400. The JBA gets some boost, but not that much. It seems to be more sport timed. I did not feel the surge when the rpm hit the sweet spot like I did on the OS. The JBA, in my opinion, is a great buy if you don't mind a few tanks to break it in.

    By the way, Turk is the real expert. When BigEd and I bought our engines, 3-4 years ago, Turk was telling everyone how to run them. He's been flying them for a long time. I only have 1 and several other types of engines so mine doesn't get used that much. He can tell you more about carbs and longevity.
    Ed Moorman, AMA 553, Former R/C Report Fun Aerobatics Columnist. 76 and up to my old tricks!

  12. #12
    Turk1's Avatar
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    RE: JBA engines, good or bad.

    Hi Ed,thanks for compliments.

    GlowHead Brotherhood #31


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