Backpack motor seized

Discussion in 'Mechanic and Repair' started by jeffyr, Dec 21, 2002.

  1. jeffyr

    jeffyr LawnSite Senior Member
    Posts: 876

    This is a quote from another thread :
    "Been running Amsoil remix at variable ratios for 8 years. 60:1, 70:1, 80:1 100:1.... whatever. Works great. Had one Stihl backpack engine seize, not because of the mix, because it was run with straight gas for over 20 minutes (well 4-5 minutes, 4 or 5 times total). Tore it down, unstuck the ring, threw in a little assembly lube and back to work it went. I believe the residual Amsoil allowed this."


    Anyone think this is possible ? I have a Red Max 6200 that was run for a tank or so on Amsoil at 200:1 by accident and seized. The backpack has been running Amsoil this whole year (after switching from regular 2 stroke@32:1) and although it is 4 seasons old and does have quite a bit of use on it, it still ran strong. I guess it is worth a shot since it is worth nothing to me but a parts machine. :confused:

    Thanks.

    Jeffyr
     
  2. General Grounds

    General Grounds LawnSite Senior Member
    Posts: 902

    :blob3: jeff, if the rest of the blower is in good shape you can get a short block for that blower its about $200 and takes about a 1/2 ande hour to do. the redmax part # for the short block is 2750-05010, probably a good idea to change all gaskets too, gasket part # is 2750-06010, if you do this you will virtually have a brand new blower. i've done it once and worked out very well. Tony
     
  3. jeffyr

    jeffyr LawnSite Senior Member
    Posts: 876

    $200 sounds allot better than $500 Tony.
    1/2 hour ! Does it come with instructions ?

    Thanks very much.


    jeffyr
     
  4. General Grounds

    General Grounds LawnSite Senior Member
    Posts: 902

    :blob3: jeff, there are no instructions but it is very self explantory.tony


    nedd any help just send me an email
     
  5. captdevo

    captdevo LawnSite Senior Member
    Posts: 932

    better check your prices again....it'll cost ya close to $300!!

    i take trades on equipment too!!
     
  6. Doc Pete

    Doc Pete LawnSite Gold Member
    Posts: 3,469

    I'm not sure of the exact question, but first, Gas is "not" refined well enough, and because of this there is a "small" amount of oil in it. Second, "hard siezes" are usual from a new unrun motor, which are the ones that can ruin a motor. Yours of course had been run a lot and clearances have opened up a bit and I believe this could have saved your motor.
    Pete
     
  7. captdevo

    captdevo LawnSite Senior Member
    Posts: 932

    if you ran 1 or more tanks through it, i'd take it apart and see.

    i'd bet you scored the cylinder wall, and overheated the bearings as well.
     
  8. jeffyr

    jeffyr LawnSite Senior Member
    Posts: 876

    Pete,

    The original question was "Anyone think this is possible ? " in reference to another post about freeing a stuck piston and using the blower again. I never mentioned anything about the gas refining :confused: ......but when you say "Yours of course had been run a lot and clearances have opened up a bit and I believe this could have saved your motor." are you saying it is worth a shot to open it up and try and free it before looking at alternatives ?

    If so....what is the best way to free the piston from the head ?



    Thanks.

    jeffyr
     
  9. MOOSE

    MOOSE LawnSite Senior Member
    Posts: 393

    I've seized many of back pack blowers & lawn boy push mowers. Put some oil down spark plug hole and let it sit over night. Make sure u put 2 cycle oil though. And crank on it and it should break loose. I've done this mant times.. Did it once on an 350 motor too! it worked.
     
  10. Doc Pete

    Doc Pete LawnSite Gold Member
    Posts: 3,469

     

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