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Thread: seemed to have lost mag side cylinder!

  1. #11
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    Got my needle and seat out and it seemed pretty good except the o ring seems pretty worn. I can imagine that woould let fuel seep by when sitting. How do I determine the size of these and where can I get new ones? Figured I would replace them for piece of mind. I really would like to give the 660 radar run another go this weekend since I got the recommended helix and secondary spring!!

    Thanks guys

  2. #12
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    MY local Yamaha dealer stocks them!

    did you pressure check your needle valves?

  3. #13
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    Quote Originally Posted by RXMax View Post
    MY local Yamaha dealer stocks them!

    did you pressure check your needle valves?
    I did not. I would not know how to go about that!

  4. #14
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    I ordered 3 new needle and seat kits, will have by Thursday will let you know if it cures her! If I amvdoing all 3 will I still need to make carburator adjustments?

  5. #15
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    Good call! I was going to suggest that!

    Put them in and make everything is to stock spec for mixture screw, needle height and float level.

  6. #16


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    the crappy ethanol used in gas these days breaks down the rubber carb parts over time. I have seen more and more O-rings and fuel lines, etc getting hard and brittle and need replaced. These sleds are now getting old as well.... 2000 srx is now 18yrs old...lol, so its not really a surprise these items will need changed.
    It's just a little 700!

  7. #17
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    I never adjusted anything on my carbs except jetting and air fuel screw. They aren't cheap $116! A few hundred more I could have got mr viper to trail port her!!

    Thanks Guys

  8. #18
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    ethanol is terrible! I found some non ethanol gas stations and have been using that now that she don't see trails anymore.

  9. #19


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    I did a little clicking around, I believe these are the ones you would need. https://www.amazon.com/gp/offer-list...&condition=new which is way cheaper. https://www.jetsrus.com/individual_p...02_900_su.html Even these mikuni ones are cheaper
    2004 Viper slp triple pipes Mrviper700 trail ported Heel Clickers
    M10 Kimpex Aggressor 1"3/8 paddle
    MPI lightweight trailing arms
    Homemade fuel screw adjusters
    Rox running boards
    Madd pivot block 1.5" Riser



  10. #20
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    Thanks I appreciate you looking around. I already ordered them and did over night shipping so I would get them and be ready Saturday for the radad runs! My price included new screens as well. I will follow up Friday with the results of the new needle and seat kits.

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