Seals on 80cc Z80 would like some input.

Discussion in '2-Stroke Engines' started by wan37, Jun 12, 2012.

  1. wan37

    wan37 Member

    I have a 80cc that would not idle for nothing pop off the magneto cover bam found oil mixture .I know how to take the magneto off and the coil (magnet ) too.I would like to know how to get seal out and put a new one in it?
     

  2. Big Red

    Big Red Active Member

    If it's like the seal on the other side you can slip a small screwdriver in beside the shaft and pry it out. Be carefull not to scratch the shaft or the case where the outer seal seats or the new seal might leak.
    Big Red.
     
  3. wan37

    wan37 Member

    Thanks big red
     
  4. Purple Haze

    Purple Haze Active Member

    They pop out fairly easily, don't worry about re-using them, as they are junk. Like Big Red says, go easy on the surfaces, very important. Get new seals from bikeberry or other reputable dealer, they have seals made in Taiwan that are better than the **** on ebay. Carefully install them, sometimes they are a bugger to seat without cocking the lip, that'll take care of it.
     
  5. wan37

    wan37 Member

    Well does any one know what size the magneto side seals are it's a Z80 bgf motor?
     
  6. Big Red

    Big Red Active Member

    Al Fisherman would know. Look him up and PM him. I'm sure he'll be glad to help.
    Big Red.
     
  7. Purple Haze

    Purple Haze Active Member

    The magneto side seal is 14.8 X 27 X 3.8 MM. The clutch side is the same, except it is thicker, @ 7.5 MM. There is someone on another forum experimenting with quality double-lipped seals that measure 15 X 27 X 7 and 15 X 27 X 5. Some say they won't seal, but I think I'm going to try them, as the machining tolorances on the shaft can be off enough to make .2 MM difference moot. I like the peace of mind using higher quality parts, and these seals are critical to engine life, and difficult to change.
     
  8. wan37

    wan37 Member

    well I will like to try them if there better.But I will buy a regular one for now to get it going.I got lucky the old one was chewed up pretty good and it came out pretty good.I think people should really go through a new engine really good.I have had it for awhile but never got it running because of the centrifugal clutch had to mount it higher for it to clear.
     
    Last edited: Jun 14, 2012
  9. wan37

    wan37 Member

    Oh I went to take it a part to get the old seal out and the magneto was cover in gas oil on the back of it.So it's probably going to burn out too.Went to take magnet off and to find there no key way on crank shaft.I wish I would of got it going a lot sooner I would have sent it back.I know now what a lot of you people say in here go over them really good and change hardware.
     
  10. Purple Haze

    Purple Haze Active Member

    The keyway is probably stuck to the magnet. When you re-install the magnet, the key will want to jump out of the groove and stick to the magnet, they're a bugger to work with!
     
  11. Big Red

    Big Red Active Member

    Al Fisherman had a GREAT idea about replacing the magneto key. Crazy glue it in. Unless it fits really tight it will jump out to the mag every time making it a real P.I.T.A. to replace.
    Big Red.
     
  12. wan37

    wan37 Member

    I have extra's key ways so it don't bother me there wasn't one in there.Just glad to find that now tho.I have glued them in before and it works great.Thanks guys
     
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