Tagged: Elto Cub carburetor
August 20, 2019 at 3:37 pm #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.
US Member - 1 Year
Topics: 17August 20, 2019 at 9:09 pm #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”August 23, 2019 at 8:55 pm #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?August 23, 2019 at 10:42 pm #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?August 24, 2019 at 9:36 pm #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…
Topics: 31August 25, 2019 at 9:22 am #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
- You must be logged in to reply to this topic.