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  1. #1

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    US 41 engine manual

    I am trying to locate a pdf of the manual for the US41 gas engine, I have searched a couple of time with no success, does anyone have a copy of the manual in pdf or know of a link??
    Thanks in advance

  2. #2

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    RE: US 41 engine manual

    I think I still have a copy of my Quadra manual somewhere in my files. I have both engines and the Quadra manual is good for both. Send me a PM and I will send it back. Meanwhile, I see if I can find it.

    Bedford

  3. #3

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    RE: US 41 engine manual

    theres one in the quadra aerow engine forum. if you read the pdf they say run 20:1 gas to oil ?

  4. #4
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    RE: US 41 engine manual

    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

  5. #5

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    RE: US 41 engine manual


    ORIGINAL: WhiteRook

    theres one in the quadra aerow engine forum. if you read the pdf they say run 20:1 gas to oil ?
    My guess is that's due to the oil commonly available at the time? Today's oils allow 40 and 50:1 to be much more common.

  6. #6

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    RE: US 41 engine manual

    probly true . the oils might be better now. I just bought a Q100B used and , do you know what size the threaded holes
    are on the mount ? there are 2 non threaded that are mabey 5mm and 2 threaded .


  7. #7

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    RE: US 41 engine manual

    Can anyone tell me what kit number for the walbro carb. is? I have an older engine (US41) that is new, but would like to replace the kit with one that is compatable with gas mixed with ethanol. Read on an older post that the carb. number should be near the fuel nipple, but did not see one. Thank's in advance for any help!

  8. #8

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    RE: US 41 engine manual

    Thanks for the qutra manual, I forgot the mixture and thought I was using 40:1 but the manual saying 20:1 for regular 30wt oil, I guess 40:1 should be OK if I run amsoil??

  9. #9

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    RE: US 41 engine manual

    94,

    You open a mammouth subject asking about oil. Stand by. I ran mine on off-the-shelf air cooled engine oil (WalMart or elsewhere) at about 32:1. After a while I converted to Amsoil synthetic at 100:1. There has been MANY negative things said about this Amsoil on these pages, but it has worked for me. DO NOT take the Amsoil intended for 100:1 and think you can get away with working it at 50:1. That is not a viable solution. I think Amsoil says you should not go stronger than about 80:1. They have other mixes for stronger ratios.

    This engine will respond to most any oil ratio you give it so long as you follow the oil manufacturer's directions, and avoid water-cooled outboard motor oil.

    That is just me.

    Bedford


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