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  1. #1
    jvanoy3's Avatar
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    i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    Hey every one,
    i need to convert a weed eater engine into a rc plane engine. I am going to buy a engine but i have no clue what and how to convert it into a rc plane engine. I am puting it on a plane i built from scrach and i do not want to buy a gas engine all done for it because it is to much money and i spend to much money on this stuff now. Please help me

  2. #2

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    RE: i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    you can find pre-converted engines for around $200 new, you will probably spend quite a bit more than that doing your own conversion, plus you need your own lathe, or pay someone to do the work for you anyway.

    although not a promotion since I haven't fired it up yet, check out
    http://www.gcbmrc.com/engines.htm

    Michael sells a converted 25cc homelite for $212. I got mine in last friday, looks great, just have to finish the plane now! If you have access to a way to balance it, the flywheel could loose a little weight yet, might do that myself sometime. (fins could be removed and then rebalanced)

  3. #3
    KenLambert's Avatar
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    RE: i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    I sell A new ready to Homelite for 165.00 already just mount and fly thats shipped in lower 48 Kenneth
    website
    www.lambertsrc.com
    Super Tiger conversions
    thanks Kenneth

  4. #4
    rsjr's Avatar
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    RE: i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    james111v, what size is your airplane ? How much does it weigh ?
    Fly it like you hate it, fix it when it breaks.

  5. #5

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    RE: i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    Buy a ryobi weed trimmer from harbor freight http://www.harborfreight.com/cpi/cta...emnumber=55008
    they raised the price recently to $59.99.
    Get a conversion kit off ebay for 26.00 and your set.
    total cost for a new engine $86.00 plus s&h.
    Put it on a Ultra Spad Stick
    http://www.spadtothebone.com/SPAD/ultraspadstick/
    and you got plane and engine for $100.00
    Tommy

  6. #6
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    RE: i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    I agree here with Tommy. Buy the Ryobi from harborfrieght. The one harborfrieght has for $59.95 is the short shaft version. You'll need to order a conversion kit from e-bay or I would contact Peter at www.wackerengines.com. Peter is a great guy to work with and he will not stir you wrong. He sells everything you'll need for weedeater conversions and he'll give you the right answers. I have ask him many questions on this Ryobi conversion and I have converted this short shaft model. With the parts I have gotten from Peter at www.wackerengines.com I am getting 7000 RPM with an 18x8 prop and the stock carb. I did buy his muffler and it also helped in getting me some more RPM. Total cost of a conversion kit for the short shaft model is $30.00. (Muffler is $25.00 more) Good Luck in your venture. I know you'll have a ball
    Jim Stanton
    Millington, TN 38053

  7. #7
    Volfy's Avatar
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    RE: i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    Wait around for a while and the $49 sale will rotate back. http://www.onestopgardens.com/ has an ad for $49 Ryobi 31cc. Onestopgardens.com is a marketing arm of Harborfreight. This is a short shaft version. Having converted both long and short shaft, I am liking the short better. I agree that Peter Faith of WackerEngines is a great guy to deal with. I bought several Walbro carbs from him a while back.

    IMHO, the best and easier DIY conversion is the CH Ignition kit for the weedies. For $119, you get all the parts required for an electronic ignition conversion - and NO machining required. You end up with a much lighter and compact engine to boot.

    Also don't forget to check with RCIGN1 here also, though I'm not sure Ralph does Ryobi or not.
    Si vis pacem, para bellum.

  8. #8
    jvanoy3's Avatar
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    RE: i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    thanks every one tommy i am actully building that ultra spad stick, how did u no. hehe I am still a little confused still but u all have help alot. thanks

  9. #9
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    RE: i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    ive delt with ken lambert myself.i bought his parts and converted my ryobi i picked up at the dump, almost new engine, for free. the fuel line was broke in tank.anyway,with kens parts and a brand new 18x6 mas classic prop,my engine cost me $56.00. thats with the stock muffler.hes a great guy to deal with.

  10. #10

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    RE: i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    rkramer
    plus you need your own lathe, or pay someone to do the work for you anyway.
    I disagree on needing a lathe; sure it would be nice but NEED, no.
    In a pinch a large cutoff wheel chucked into a drill press and those fins can get shortened uniformly without a trip to machine shop. Muffler replacement is abit more challenging, engine for USStik will have a DIY no welds exhaust deflector which will fit without cutting the bottom out forward of firewall.

    Got another one getting a larger carb for Kraut's UltraSpadStick which is in the works.

    A sample of flywheel done as discribed.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    trying to tax into prosperity is like a man standing in a bucket and trying to lift himself up by the handle W. Churchill

  11. #11
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    RE: i need to convert a weed eater engine into a rc plane engine, about a 35-45cc engine i need

    It isn't the fins that need a lathe, although it does do a very neat job. My very first conversion was a Ryobi and I just broke off all the fins with a pair of pliers and then ground them down smooth with a dremel tool. I had to rebalance the flywheel after that, but these weedie flywheels all need balancing anyways.

    Actually it is the center part of the flywheel where the prop hub will seat against that needs turning. On mine, it worked well enough to run the engine without any machining, but the ridges on the flywheel didn't really allow the prop hub to seat properly. Plus, the flywheel was just a bit too thick. I ended up trashing the flywheel and went CH ignition. What a difference $119 makes! It took me 1/2 hr to bolt on the CH ign. and set the timing versus some 4-5 hrs working on the darn flywheel.
    Si vis pacem, para bellum.


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