The KTM300 Thread

Discussion in 'Thumpers' started by GasGas300, Jan 11, 2010.

  1. Gordy

    Gordy Team Listo

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    :lol3. At any rate, he might want to find a new mechanic. :uhoh

    Sorry, but that just shouldn't happen to a fresh rebuild. :huh
  2. JTucker

    JTucker Long timer

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    I've seen powerseal fix worse, that almost looks like a circlip came out but it's obviously still in there. Definitely check the bottom end out for loose parts.
  3. DougZ73

    DougZ73 Fading off.........

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    Thanks for the support...or lack there of. :lol3

    The motor was not open for any length of time....only when working on it.

    Nothing was dropped in there, as far as I know. No missing parts, clips, etc. Everything is accounted for.

    There was coolant in bike. heat cycled, as as I did on the other rebuilds. Only other thing than the previous, those were done in heat of summer, and this was during colder, more recent weather.

    Basically, I did nothing different than I did on previous top end rebuilds. Makes it that much more baffling.
  4. HellSickle

    HellSickle Scone Rider

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    Check with Lancourt. I had them weld a deep groove in a cylinder and replate.
  5. Just John

    Just John Been here awhile

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    Is that plug gray ?
    W brand piston ?
  6. AWM

    AWM Beard Bros Racing

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    Hey old pal,,,,did you flush the cases totaly before you put it together.
    That was something caught between the piston/rings and clynder.:huh
    I had a bike years ago,that i had someone else rebuild.And after couple hundred miles i heard a bad,bad noise.
    Pulled it apart and it looked like someone went to town with a diegrinder.
    Come to find out the fucktard dropped a circlip in the case while putting one of the pistons in,and instead of spliting the cases to fish it out,,he just got another and put the motor together.:cry
    The pistons looked just like that.Took awhile to figure it out,cause i had all the parts it was supposed to have.
    Just say'n.
  7. DougZ73

    DougZ73 Fading off.........

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    @ John: Wiseco piston. Ill have to pull plug and look at it again. O did pull it to see if it was white....indicating a lean condition. It was dark...IIRC.

    @ Scott : the bottom end was totally redone by Andrew Cooksey when I redid bike. He does great work and bottom end came back like new. I did top end and installed in bike. I had about 20 hrs on that topend but then developed a lean condition that I was chasing after tuning it one day. I had gotten a big airleak and was thinking it was the base gasket ..so I decidedif to change it. Other than running lean, mechanically, it was strong and ran well.

    Consensus is something got stuck in there between piston and wall

    ..but what remains to be seen.

    Bike is maxed out on worth vs what I have in it. So now, my issue is do I put the money it needs to run right again ...$400- 500 more????

    Sent from my DROIDX using Tapatalk
  8. Mac

    Mac Long timer

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    Current value with a jacked up engine?
  9. De250r

    De250r Adventurer

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    Good thread makes me want a 300.


    Sent from the back woods of vt via patchy Internet
    Live free and ride hard
  10. Gordy

    Gordy Team Listo

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    Hey guys. I may want to freshen up the plastic on my '09.
    Where are you guys getting plastic? OEM? Can I get something other than the stock orange for an '09?
    How about graphics? Who are you buying from?

    Thanks!
  11. HellSickle

    HellSickle Scone Rider

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    I was going to put an SX head on my '11 300 XC-W. The higher compression is supposed to boost low end torque, especially at our high altitude.

    I was chatting with a guy on the trail this weekend who had done the mod. His already miserable gas mileage got worse. This might dissuade me.

    Anyone else have experience on gas mileage differences? I've finally got my jetting sorted out, and I'm still disappointed with the mileage. I'm not sure the additional torque would be worth the decreased range.
  12. HellSickle

    HellSickle Scone Rider

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    Acerbis makes aftermarket in multiple colors. They should be available from the major mail order places.
  13. Gordy

    Gordy Team Listo

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    I get around 32+ MPG in average dirt. It may go a little less in WFO desert sand, but not a whole lot less. I think that is great.
    Stock head, JD jetting, gnarly pipe.

    Thanks for the reply on the plastic! :thumb
  14. ganshert

    ganshert not sleeping

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  15. Wallace

    Wallace Seat belt tight babe?

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    Gordy, have good luck with Munn for oem plastic (Acerbis) in multiple colors.Use your KTM talk discount. Also Ride PG for graphics as they will make custom including complete "gripper" style. :thumbup
  16. Gordy

    Gordy Team Listo

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  17. Wallace

    Wallace Seat belt tight babe?

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    833
    That's so you.......:rofl
  18. DougZ73

    DougZ73 Fading off.........

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    Just a head's up for anyone interested. I am going to be selling my 98 KTM 300 EXC...as seen in posts in this thread. Needs new top end/replated cylinder. That is the bad, the good is its a legally plated two stroke in NJ. :clap:clap

    Reason: Just had a kid, and have no time to ride, not to mention time to fix this, nor the money....so I shall part ways with it, to someone that can use it, instead of it rotting to death in my shed.

    Full disclosure about bike can be seen in all my posting in this thread.

    I have a tentative offer from riding buddy of a riding buddy. If that falls through, I will be putting it up on here first...and will link my flea market thread.
  19. AMCJEEP

    AMCJEEP Been here awhile

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    Congratulations on the kid!!

    And definitely let us know on the sale. I know of a couple of people that may be interested me being one.
  20. DougZ73

    DougZ73 Fading off.........

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    Thanks, will do. If I don't hear from him by weekend, I'll probably make for sale post.