Elto Cub info

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This topic contains 7 replies, has 4 voices, and was last updated by Tubs Tubs 3 weeks, 5 days ago.

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    #181640

    I’m restoring a Cub and thought maybe someone could tell me a good starting point for the mixture needle. One full turn out? Two? Before I took it apart it was about five or six turns out, and it was flooding badly.

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    smokeonthewater
    US Member - 1 Year
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    #181676

    By no means an official answer here, but I’ve generally used 1 turn on my small Elto’s to get me in the ballpark, when the original adjustment was found to be “somewhere in the weeds”

    Tubs
    Tubs
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    #181701

    • This reply was modified 1 month ago by Tubs Tubs.
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    #181862

    Thanks very much! Looks like 3/4 turn was just about right. However, I cannot get it to start in the water. I can start it on the stand then lift it and put it in the barrel. It dies immediately. Does it need new rings? Part number? Where can I get them?

    Tubs
    Tubs
    US Member - 1 Year
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    #181864

    It could be low on comprehension.
    I have re-ringed one twice but it still wont run. Maybe they
    are not seating? Maybe the mains are worn out and its
    sucking air past them? Haven’t figured it out yet but more
    of these don’t run than do. You can get rings OTTO GAS
    ENGINE WORKS if you want to try.There is a link below.
    $5.00 + $.50 shipping each. If you decide to change
    them I would like to know how it comes out. Better?
    Same? Worse?

    http://www.ringspacers.com/ringcost.htm

    • This reply was modified 3 weeks, 6 days ago by Tubs Tubs.
    • This reply was modified 3 weeks, 6 days ago by Tubs Tubs.
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    #181938

    Thanks, Tubs. I will get in touch with them. I have not taken the powerhead apart yet. Do you know the part number or size? Or maybe Otto knows the size…

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    garry-in-tampa
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    #181947

    The usual problem is poor crankcase compression. The smaller the piston , the more sensitive it is too ware. A thousandth or two is hardy noticed on a big piston, but is a large amount as a percentage of size on a small one. Singles and alternate firing twins load the forward part of the main bearings which causes them to became egg shaped. This coupled with a lack of seals also causes a loss of pressure. The 2-½ horse Johnson is also sensitive in that respect. You can compensate somewhat by using a heavier oil. ie. SAE 40 or 60 weight. This would probably require a hotter heat range spark plug and will carbon over the exhaust ports. Some have knearled or stretched the piston skirt to increase sealing, but you don’t have much material to work with.

    Garry in Michigan

    Tubs
    Tubs
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    #181952

    His “Standard Stock Ring” 1.125 (1-1/8″)

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