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DC310r

tri z 250 wont rev past 3/4 throttle

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i have a 86 tri z 250 Ever since i got it it hasnt ran quite rite,In lower rpm runs ok and free revs great but anything past 3/4 it acts like it has a rev limiter?Its all stock with a pipe,I thought it mite be carb so a i put one my 38mm carbs on and it still does the same thing just gets there faster know lol.This machine should be right up there with my 250"s just not running a maximum.please help.

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    • By Dra O
      posted a while back - it was running at one point - I have all the plastic shroud off - it's down to frame and engine now
      -fuel pump: when line from petcock is attached, no fuel comes out other side to carb; the line to the carb is open (can blow through it); I thought when I cranked engine that the pump would spit out fuel on other side but it does not; I removed fuel pump and opened it up - diaphragm looks good - but internal areas had lotsa calcification build up - I cleaned this out and dried it good - the clear plastic pieces (?diaphragms) aren't broken - the spring w/ steel ball on end moves freely; am putting it back on tomorrow; but can anyone answer about the pump? isn't it supposed to pump fuel through it... to other side... to carb? puzzling
      -along with fuel pump: I replaced petcock 3 weeks ago (gas tank had rusty fuel in bottom - cleaned it out prior to new petcock); when I turn petcock arrow NOT to on or reserve, fuel comes out of line; when I turn it to on or reserve, fuel doesn't come out; puzzling
      -I don't know what's on back of fuel pump - it's a valve that has a hose coming out of it - looks like it goes to engine/carb - I haven't traced this out yet - what is it?
      -can squirt gas on air filter and engine will run for 2-3 seconds then stop - fuel in top of carb (under diaphragm) does same
      -it likely needs carb rebuild - will get to this - but something isn't allowing fuel to get from fuel pump to carb
      -I THINK it has a mikuni model x carb - diaphragm is ID 26mm  OD 68mm - hard to find inexpensive diaphragm, I guess because it's a model x
      -last thing - I replaced solenoid due to old one clicking; I HAVE to be charging the battery or it won't start/turn over - battery just goes dead; but if charging, it'll turn over nicely; i'm guessing it's a bad battery
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    • By GatorHunter
      Clymer ATV Manual - Polaris ATVs
      You can also find ATV Manuals on Amazon.
      Here is my list, some I have had, some I got online
      I have put all Manuals on my dedicated server, so the links won't go dead. Most the manuals listed below are on the server and there may be some on the server that's not on the list. Scroll to the bottom of this post to get the link.
      If you need a Manual that's not on the list, leave a reply, I will try to locate it, if I can't, I'm sure another member would share if they have it.
      If you have manuals that are not in the list and you would like to share them, leave a reply, with a link to your manuals and I will add them to my post so they are all in one spot.
      Thank you, and enjoy
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      1985 thru 1995 Polaris Service Manual
      Below is the list of machines this Manual covers
      1985 Scrambler
      1985 Trail Boss
      1986 Scrambler
      1986 Trail Boss
      1987 Trail Boss
      1987 Trail Boss 4X4
      1987 Cyclone
      1988 Trail Boss 2X4
      1988 Trail Boss 4X4
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      1989 Trail Boss
      1989 Trail Boss 2X4
      1989 Trail Boss 4X4
      1989 Big Boss 4X6
      1990 Trail Blazer
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      1990 Trail Boss 2X4
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      1990 Trail Boss 4X4
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      1990 Big Boss 4X6
      1991 Trail Blazer
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      1991 Trail Boss 4X4
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      1991 Big Boss 4X6
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      1992 Trail Boss 2X4
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      1992 Trail Boss 4X4
      1992 Trail Boss 4X4 350L
      1992 Big Boss 4X6
      1992 Big Boss 6X6
      1993 250 2X4
      1993 350 2X4
      1993 250 4X4
      1993 350 4X4
      1993 250 6X6
      1993 350 6X6
      1993 Trail Boss
      1993 Trail Blazer
      1993 Sportsman
      1994 300 2X4
      1994 400 2X4
      1994 300 4X4
      1994 400 4X4
      1994 300 6X6
      1994 400 6X6
      1994 Trail Boss 2W
      1994 Trail Blazer 2W
      1994 Sportsman 4X4
      1994 Sport
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      1995 Trail Boss
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      1995 Sportsman 4X4
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    • By Cj Winds
      I have a 2000 Polaris Xplorer with the 250 two stroke motor
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