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Hot!Full Crank Engines

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MdStamen
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2017/11/24 11:19:52 (permalink)
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Full Crank Engines

 It seems Ryobi has gone to the Full Crank engines.
I just ordered one to see how it performs. In reality the half crank is a model airplane engine design. One bearing and the pull string a bear to get to.
They carburetor does not have a idle jet. I guess this is to make it California Compliant. They use the rotary valve with a needle instead of the older butterfly. This is a improvement. The 30cc is replaced with a 25 cc.
As far as the carburetor it kinda reminds me of the older motorcycle gas carburetors.
Anyway, when I get mine I will post hot it performs.

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    AVB
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    Re: Full Crank Engines 2017/11/24 13:44:17 (permalink)
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    Depends how you look at it. Even most of the rotary carburetors do have a idle mixture adjustment even though they don't have separate idle jet. Plus you have a lower torque level by dropping the 5cc.
     
    Plus I hope you're going with the 2 cycle version as 4 cycles around here are just not holding up. It is results of not oiling properly due inverted and sideways operations. The only 4 cycle trimmers that are holding their own here is the Stihl 4-mix versions that still uses a 2 cycle mix.
     
    On top this most of the newer Ryobi are basically non repairable when comes to engine as they only provide short blocks beyond the externals.
    post edited by AVB - 2017/11/24 13:46:37
    MdStamen
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    Re: Full Crank Engines 2017/12/03 08:42:06 (permalink)
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    I went with the 2 cycle. The replacement parts are very inexpensive.
    As for the 4 cycle, Home users do not understand that a 4 cycle needs to be used ONLY in certain positions.
    The Stihl 4-mix version is a excellent idea to overcome this problem.
    The 4cycle engines have a lot of torque at lower speeds and they run quieter.
    I was hoping to see some Stihl 4-mix version threads on this site.
    MdStamen
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    Re: Full Crank Engines 2017/12/03 17:17:49 (permalink)
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    I got it today and I did a thorough test.
    It starts differently. You need to hold the throttle to get it started. It started easy using the instructions on the air filter.
    It took about 5 minutes to get it to run full throttle. I used the tiller attachment and it did have plenty of power.
    And there  are no adjustments for the fill throttle/ no adjustable jet.
    The new bump head looks interesting. I will be checking this out in the spring.
    The season is almost over here in Maryland.
    MdStamen
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    Re: Full Crank Engines 2018/05/02 17:18:21 (permalink)
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    After a full testing They are Garbage. They idle fine and mid range fine. The High speed needs more gas. I do not see a way to raise the jet needle. A big disappointment.
    AVB
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    Re: Full Crank Engines 2018/05/02 18:13:56 (permalink)
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    What carburetor did they put on it?
    MdStamen
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    Re: Full Crank Engines 2018/05/03 07:01:32 (permalink)
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    I uploaded a picture of it. A RuXing H 639. I was hopeing the jet could be raised, but there is not a way that I can see.

    Attached Image(s)

    AVB
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    Re: Full Crank Engines 2018/05/03 13:10:46 (permalink)
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    Don't have a Ruixing Rotary on hand to look at here. Have check the top of the rotor section to see there is EPA plug you can remove? Or better yet post a image looking down top of the rotor where I can see down the center hole.
    MdStamen
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    Re: Full Crank Engines 2018/05/17 09:33:45 (permalink)
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    I cannot get a good picture. It looks like a very small pac man and it is small.
    I tried lifting the  throttle while it was running, but no difference.
    I looked on ebay  and I did not see a tool for it.
    AVB
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    Re: Full Crank Engines 2018/05/17 10:26:39 (permalink)
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    Goto https://smile.amazon.com/s/ref=nb_sb_ss_i_4_4?url=search-alias%3Daps&field-keywords=8+pcs+carburetor+adjustment+tool+kit&sprefix=8+pc%2Caps%2C178&crid=JH1D7NDYM9CD
    to find an 8 pc set. Also includes the small D and the 4mm hex that on some of the newer Zama carbs.
     
    I use Smile Amazon as I donate a portion of my purchases to charities.
    post edited by AVB - 2018/05/17 10:28:04
    MdStamen
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    Re: Full Crank Engines 2018/05/17 11:07:01 (permalink)
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    Thank you! The one needed is shy of 3mm.
    AVB
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    Re: Full Crank Engines 2018/05/17 11:45:59 (permalink)
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    MdStamen
    Thank you! The one needed is shy of 3mm.

    Actually the small Pac Man screw is about 1.78mm OD and the hole that the toll fit into is just under 3mm. I have ran into the small Pac Man yet but use the small Single D several times on the Echo Zama rotary carbs. Pulling that EPA plug is fairly easy once you got the extractor for it which is a 2.5 mm LH threaded but have had to the 3mm extractor a couple times too where operators and other tech try unsuccessfully to remove the plug.
     
    I did throw away the large Pac Man that came with my set as my older Pac Man is much better made.
    MdStamen
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    Re: Full Crank Engines 2018/05/18 14:03:28 (permalink)
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    Thanks
    I ordered the 8 pc set. Hopefully that will work.
    I used to have to adjust the jets on my BSA Amal Carburetor. Tat was done with a E clip.
    MdStamen
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    Re: Full Crank Engines 2018/05/27 18:04:44 (permalink)
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    I am still waiting for the kit.
    I installed the Amsoil oil at the 80 to one ratio with High test gas.
    Believe me the problem left and the Ryobi runs excellent. I also tried this mixture on my Echo Pe and that runs like a new machine.
    My son mentioned to me that must have tuned up the Ryobi and Echo.
    If someone told me this I would not believe them.
    I am still scratching my head.
    MdStamen
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    Re: Full Crank Engines 2018/06/02 15:32:41 (permalink)
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    I got the kit it does not fit. I could remove the jet it is just pressed in. The tool is close, but not close enough.
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