1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Yamaha Blaster Top End

Discussion in 'MX / ATV / UTV' started by Zack1978, Feb 22, 2007.

  1. Zack1978

    Zack1978 SILVER Star

    Messages:
    2,972
    Media:
    1
    Likes Received:
    118
    Joined:
    Oct 12, 2004
    Hey everyone,
    I am the orig owner of a 1992 Yamaha Blaster. I have ridden the machine a lot since 92, and I have never done a top end. I know that it must be about time to get it done. The machine runs fine, and usually starts on the second or third kick, however I know that it should be done. Well the local bike shop just went out of buss, so now I am stuck. How do I do this job? How hard is it? What might it cost? Do I have to bore the cyl? Any advice, tips, instructions, etc? Any 2 stroke experts out there?

    Thanks,
    Zack
     
  2. Mace

    Mace rock scientist.. Staff Member s-Moderator

    Messages:
    21,305
    Likes Received:
    1,735
    Joined:
    Feb 17, 2002
    Location:
    Las Vegas
  3. JJS

    JJS

    Messages:
    2,310
    Likes Received:
    0
    Joined:
    Nov 1, 2005
    Location:
    USA
    You think that's strange? My buddy has an '86 250R with the original top end. It still runs like new.

    Pull the cylinder. The piston is held on with clips on either side of the wrist pin. It's very easy. I can't imagine a rebuild kit being more than $100 for one of those.
     
  4. Zack1978

    Zack1978 SILVER Star

    Messages:
    2,972
    Media:
    1
    Likes Received:
    118
    Joined:
    Oct 12, 2004
    Ok but what are the steps to doing this job? Does it have to be bored out, or is it just new rings and a piston? I have never done this type of work before.

    Zack
     
  5. Mace

    Mace rock scientist.. Staff Member s-Moderator

    Messages:
    21,305
    Likes Received:
    1,735
    Joined:
    Feb 17, 2002
    Location:
    Las Vegas
    Depends on the inner case. typically it is just a rering and piston. If the bore has been coated or not, I don't know..

    Pull plastic
    Pull carb
    Pull exhaust
    Unbolt head

    Pull cylinder

    replace the piston

    follow directions backwards after looking up the torque numbers for tightening the bolts..


    Which is why I reccomended putting a big bore into it. That way, even if the cylinder is hashed, there is no more work, you just replace the cylinder...
     
  6. fsusteve

    fsusteve

    Messages:
    3,802
    Media:
    18
    Albums:
    1
    Likes Received:
    49
    Joined:
    Aug 2, 2003
    Location:
    Naples/Big Pine Key, Fl
    If it's running why rebuild it? Just curious...
     
  7. Zack1978

    Zack1978 SILVER Star

    Messages:
    2,972
    Media:
    1
    Likes Received:
    118
    Joined:
    Oct 12, 2004
    Well on a 2 stroke, I am sure that I am on borrowed time. I know that if the top end goes you will cause a lot more damage. I have been told that it is just normail maintainance on a 2 stroke.


    Zack
     
  8. D'Animal

    D'Animal Rescuer of Beagles & Landcruisers Moderator

    Messages:
    21,172
    Media:
    180
    Albums:
    8
    Likes Received:
    403
    Joined:
    Mar 31, 2006
    Location:
    Central California
    Don't mess with it unless you have to.


    Who told you it should be done? Most people who have to rebuild thier top end do to a lack of lubrication.

    They ran it out of oil, ran crappy oil, forgot to mix thier oil, the oil injection quite working, etc.
     
  9. Mace

    Mace rock scientist.. Staff Member s-Moderator

    Messages:
    21,305
    Likes Received:
    1,735
    Joined:
    Feb 17, 2002
    Location:
    Las Vegas
    On a 2 stroke it is normal after a certain # of hours.. But it is more of a performance thing and not a "the head is gonna fail" thing.

    big bore kit big bore kit..

    Say it with me ;)
     
  10. JJS

    JJS

    Messages:
    2,310
    Likes Received:
    0
    Joined:
    Nov 1, 2005
    Location:
    USA
    Agreed. A friend did the Weisco 240 kit on his beater Blaster. The power increase actually made it fun to ride again.
     
  11. WES1977

    WES1977

    Messages:
    1,789
    Media:
    9
    Albums:
    3
    Likes Received:
    42
    Joined:
    May 20, 2005
    Location:
    Chesapeake, VA
    I know a buddy of mine that has been clocked on one of those doing 79mph on the hwy by the cops. I took it out the night after on the hwy and maxed it out.

    I had to write in when I saw top end. sorry. I used to have one but never worked on it. It was always in the shop. I sold it for hardly anything and I hear that guy today feels like he got ripped off. I went away from the racing atv and bought a big heavy polaris 425 magnum 4x4 that has not been in the shop, which is a 95.
     
  12. Zack1978

    Zack1978 SILVER Star

    Messages:
    2,972
    Media:
    1
    Likes Received:
    118
    Joined:
    Oct 12, 2004
    All I can say is that my 92 Blaster has been amazing!

    Zack
     
  13. JRFJ4-

    JRFJ4-

    Messages:
    696
    Likes Received:
    1
    Joined:
    May 11, 2005
    Location:
    NORTH ALABAMA
    No big bore kit

    Don't do a big bore kit. Just replace rings and piston. Probably like 100 bucks. It's no big deal, just tear into it.

    The reason to not do a big bore kit is simple. If you want something faster, buy something faster. They are generally not worth the extra $$$$$$$$

    I just sold my Banshee a few months ago. I've had a banshee for almost ten years. I still love the two strokes.

    JR
     
  14. Mace

    Mace rock scientist.. Staff Member s-Moderator

    Messages:
    21,305
    Likes Received:
    1,735
    Joined:
    Feb 17, 2002
    Location:
    Las Vegas
    I had one of each till last fall.

    The blaster was still a hoot even compared to the banshee.. completly different rides..


    :D