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Thread: Tri-z Help

  1. #1
    Join Date
    Oct 2003
    Location
    Watertown, New York 13601
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    3,382

    Tri-z Help

    Well im having a problem with my Z. It was funning fine entill the next day and now it won't rev out. It is making that rich spuddring sound. Here are the things i have checked. Cleaned carb and went up and down on jets, cleaned air filter, checked the reeds, did a compression check and a couple other things but i can't remember right now. What else would cause it to do this? It will rev out fine when im in neutral but not when im riding. I need some help, i realy don't wany to take it to the shop so im open for opinions.
    1985 YAMAHA TRI-Z 250 sold

    2006 YFZ 450

  2. #2
    Join Date
    Jan 2005
    Location
    Columbus, Georgia-Mid Dixie
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    5,301
    That sounds like similar problem I had a while back. The engine was getting enough feul at an idle but noe when I would throttle down. It turned out my feul pump was not pumping strong enough. So I rebiult it. That before I found out the vacume line that powerd it had to be replaced. long story short, check your feul pump.

    You never know, I might actually know somehting.

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  3. #3
    Join Date
    Oct 2003
    Location
    Watertown, New York 13601
    --
    3,382
    Quote Originally Posted by LonesomeTriZ
    That sounds like similar problem I had a while back. The engine was getting enough feul at an idle but noe when I would throttle down. It turned out my feul pump was not pumping strong enough. So I rebiult it. That before I found out the vacume line that powerd it had to be replaced. long story short, check your feul pump.

    You never know, I might actually know somehting.
    I rebuilt it last year, one of the liners were ripped. Would it die on me that quick? I have clear hoses and i can see the gas flow pretty good.
    1985 YAMAHA TRI-Z 250 sold

    2006 YFZ 450

  4. #4
    Join Date
    Jan 2003
    Location
    Eastern Long Island
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    1,688
    Did you try a fresh plug?

    Lots O Trikes!!!!!
    TRIKEFEST 03, 04, 05, 07, 09 Going the distance

  5. #5
    Join Date
    Oct 2003
    Location
    Watertown, New York 13601
    --
    3,382
    Quote Originally Posted by 200xman
    Did you try a fresh plug?
    I have gone through more than a box of plugs from doing tests on this thing.
    1985 YAMAHA TRI-Z 250 sold

    2006 YFZ 450

  6. #6
    Join Date
    Jan 2005
    Location
    Columbus, Georgia-Mid Dixie
    --
    5,301
    I still think it is feul related. I went through it what you described. If not that, have you checked your compression. I have also had a intake come aprt on my pro Hauler and it did the same thing. Once I replaced that it ran great.

    85 Tri-Z's
    85 Quad-Z,
    85 YT175 For sale,
    83 YTM 225DX,
    83 YTM 200L For sale,
    82 Tri-Zinger 60 For sale,
    8? YTZ 80 Conversion,
    85 YT 125,
    89 Pro Hauler 230,
    05 YFZ 450,
    99 V-Star,

  7. #7
    Join Date
    May 2003
    Location
    Houston, Texas
    --
    2,409
    Try a gravity feed bottle and see if it still does it at high speed. I have seen tons of weird things happen with my fuel pump.

    Its probably one of the most common ailments so give it a shot.

    SEND ME PM HERE - CLICK HERE

    1986 ATC 250r, 1986 Tri Z, 1990 LT 500R "Quadzilla"


    Dirtbikes:

    1994 KTM 550 MXC (yes its a two stroke...66 hp stock!)
    1988 Yamaha DT

  8. #8
    Join Date
    Oct 2003
    Location
    Watertown, New York 13601
    --
    3,382
    Quote Originally Posted by LonesomeTriZ
    I still think it is feul related. I went through it what you described. If not that, have you checked your compression. I have also had a intake come aprt on my pro Hauler and it did the same thing. Once I replaced that it ran great.
    The compression was great when i checked it and it held pressure. I spayed starting fluid around the engine to see if their where any air leaks and found nothing. The head gasket seems to be fine too. 03 ORANGE SHEE seems to think it might be a electrical problem.
    1985 YAMAHA TRI-Z 250 sold

    2006 YFZ 450

  9. #9
    Join Date
    Jan 2005
    Location
    Columbus, Georgia-Mid Dixie
    --
    5,301
    I'm out of ideas then.

    85 Tri-Z's
    85 Quad-Z,
    85 YT175 For sale,
    83 YTM 225DX,
    83 YTM 200L For sale,
    82 Tri-Zinger 60 For sale,
    8? YTZ 80 Conversion,
    85 YT 125,
    89 Pro Hauler 230,
    05 YFZ 450,
    99 V-Star,

  10. #10
    Join Date
    Oct 2003
    Location
    Watertown, New York 13601
    --
    3,382
    Quote Originally Posted by LonesomeTriZ
    I'm out of ideas then.
    Me too
    1985 YAMAHA TRI-Z 250 sold

    2006 YFZ 450

  11. #11
    Join Date
    May 2003
    Location
    Houston, Texas
    --
    2,409
    Did you try the gravity feed?

    I know its frustrating....remember my Z was having trouble last week or so. Once I ran it hard....every cleared out and it got back to normal.

    You can never rule out that fuel pump.

    SEND ME PM HERE - CLICK HERE

    1986 ATC 250r, 1986 Tri Z, 1990 LT 500R "Quadzilla"


    Dirtbikes:

    1994 KTM 550 MXC (yes its a two stroke...66 hp stock!)
    1988 Yamaha DT

  12. #12
    Join Date
    Jan 2005
    Location
    Columbus, Georgia-Mid Dixie
    --
    5,301
    Quote Originally Posted by Darius1502
    Did you try the gravity feed?

    I know its frustrating....remember my Z was having trouble last week or so. Once I ran it hard....every cleared out and it got back to normal.

    You can never rule out that fuel pump.
    Agreed......

    85 Tri-Z's
    85 Quad-Z,
    85 YT175 For sale,
    83 YTM 225DX,
    83 YTM 200L For sale,
    82 Tri-Zinger 60 For sale,
    8? YTZ 80 Conversion,
    85 YT 125,
    89 Pro Hauler 230,
    05 YFZ 450,
    99 V-Star,

  13. #13
    Join Date
    Oct 2003
    Location
    Watertown, New York 13601
    --
    3,382
    Quote Originally Posted by Darius1502
    Did you try the gravity feed?

    I know its frustrating....remember my Z was having trouble last week or so. Once I ran it hard....every cleared out and it got back to normal.

    You can never rule out that fuel pump.
    I will check the pump tomorrow to see if their is any dirt in it. I rebuilt it last year. I bought a new needle and seat but that did nothing.
    1985 YAMAHA TRI-Z 250 sold

    2006 YFZ 450

  14. #14
    I have a harness with the CDI and coil I could send you to help troubleshoot the electrical.
    1985 350x
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  15. #15
    Join Date
    Oct 2003
    Location
    Watertown, New York 13601
    --
    3,382
    Quote Originally Posted by BLAZERONE22
    I have a harness with the CDI and coil I could send you to help troubleshoot the electrical.
    Pm sent.
    1985 YAMAHA TRI-Z 250 sold

    2006 YFZ 450

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