The KTM300 Thread

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

  1. KingJeff

    KingJeff Adventurer

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    May 18, 2010
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    56
    Location:
    Front Range
    Does anyone have a source for old plastics? I have a 97 300 EXC, and I've found some on ebay, but seems like all the major sites don't go back further than 98...
  2. Just John

    Just John Been here awhile

    Joined:
    Jan 2, 2009
    Oddometer:
    172
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    Pine Barrons,NJ
    For sure,as you button it up and are putting away the last wrench....
    you will catch a glimpse of the original head stays.:rofl
    Been there.

    For the 1st time in 2 weeks i may get to ride today.
    Sandy + snow storm sure did turn things upside down.
    Compared to many i was just inconvenienced,lost power for 7 days,
    got it back for 2 then off 13 hours with the snow.
  3. DougZ73

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

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    NJ
    Yeah, with everything else going on lately, I have not been out on dirtbikes lately either. Wife is ready to pop anytime now, so I am staying close to home. Hopefully I'll get bike back together and ready to ride in the next few weeks.
  4. sanjoh

    sanjoh Purveyor of Light

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    Mountains of Central Florida:)
    Sorry to hear you guys have not been out riding.

    We've had perfect weather the last few days in Central FL. I've been adjusting to the 300, 2-3 hrs a day and I'm feeling comfortable!

    Hope she makes it through her first hare scramble race tomorrow! Numbers going on today:clap

    [​IMG]
  5. DougZ73

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

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    Got the KTM all back together, with the new motor mounts from Egay. I added some new silicone sealant around the exhaust flange/gasket/mount, so I did not want to start it up just yet. I wanna give that sealant 24 hrs to cure, and hopefully I have eliminated any and all air leaks. :D

    I am also giving one of those green exhaust seals(o-ring) a try, to which I did not have last time..so we'll see how well that seals too.
  6. HellSickle

    HellSickle Scone Rider

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    Bah! We were out riding our 300's this weekend. All of these shots are from the same ride.

    [​IMG]


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  7. sanjoh

    sanjoh Purveyor of Light

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    That looks like fun (xcept the white stuff:D)

    Rode my first Hare Scramble race on the 300 this past weekend. What a thirsty pig! Have the clarke 3.4g (I think) on a 99 MXC, just short of 3 laps, 27 miles and she hit reserve.
  8. RideFreak

    RideFreak Torque Junkie

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    Apr 17, 2009
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    6,535
    Location:
    Out in the NM Dez somewhere
    Been nice here too.
    [​IMG]

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    <IFRAME height=315 src="http://www.youtube.com/embed/ErsZbsNMl8Q?rel=0" frameBorder=0 width=560 allowfullscreen></IFRAME>
  9. guns_equal_freedom

    guns_equal_freedom Long timer

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    5,623
    Those pictures and that video made my private parts all tingly. :evil
  10. The Letter J

    The Letter J lost in the 690 mega

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    Location:
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    RideFreak: is that 5MOH? I actually bought my GG300 just for that trail! We have a trip planned for fall 2014 (no I'm not kidding, we have to plan waaaayyyy in advance to get anyone else to commit to trips that far from home.) How long did it take to get your group through?
  11. HellSickle

    HellSickle Scone Rider

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    My best time ever was 1 hour 50 minutes. This year I was injured & shepherding some new riders thru, so it took 3.5 hours.

    KTM 300 question: I'm putting in a new piston in my 2011 XC-W this winter. Someone mentioned a head swap to get more torque. Any leads? I thought I heard to use the SXF head.
  12. dentvet

    dentvet Long timer

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    That trail looks great!

    i think the SX head gives you a bit more snap; tighter squish zone? i rode one briefly and it was a bit more responsive than a stocker. I can't remember if it had a different CDI, too, but i think thats the hot setup. SXF is a four stroke bike
  13. RideFreak

    RideFreak Torque Junkie

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    SXS head is the one I got, like dentvet said its got a tighter squish but not as much as a modded head which I've had also. Wakes up the low end nicely (like a 300 needs that :D) yet it still gets away with HT gas, I consider it a nice $150 bolt on mod that produces results.
  14. Just John

    Just John Been here awhile

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    Yikes !
    What main jet ?
    If you lean the bike over 45 degrees,does fuel come out the over flows ?
  15. HellSickle

    HellSickle Scone Rider

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    Thanks guys. My local KTM shop says the SX head is what Slavens used to put in his mule mod. Funny that the head cost is less than a new piston. As long as I'm doing the top end, I'll put on the SX head.

    Any tips on jetting? I've been riding my 300 like a diesel. Great low end torque, then it starts to stutter at contant low throttle a few thousand RPM above idle. This causes me to short shift for cleaner running, and I'm only using a very narrow portion of the RPM range and shifting a lot to stay in that range. It rips up high, but I seldom have need for that kind of power on single track. I think I need a smaller pilot jet.
  16. sanjoh

    sanjoh Purveyor of Light

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    Exactly!

    Not sure on the main jet.

    No overflow, when leaning it over.

    Starts first kick without choke, when hot or cold, thinking the low end/pilot is stinky rich.
  17. RideFreak

    RideFreak Torque Junkie

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    In moab I had a 165, 38pilot, it's got the JD kit and I'm not sure on the needle color but it's what they recommend for 5K' (I run that 1 clip leaner). Ran very clean through the dieseling on 5MOH, ran clean in the few sections where I could get on it. There was still a little spooge running down from the silencer though. I find that setup good to about 10K' and then I can feel it needs a little leaner pilot and probably needle too but it's not so bad I'd change it unless I was spending some days up where you live. For 5MOH I ran the green spring with the dolly 2 turns in (late hit), In the desert I run a red spring flush, exact opposite, wide powerband that comes in early and smooth, nice for the sand.

    With the SXS head I find I can run the back a tooth smaller (13/49) the extra grunt works nicely with a little more gear.

    Sometimes you'll hear "pipe knock" on decel with a higher com head caused by too lean cond (not enough fuel when the throttle is suddenly shut down), if you run in the a/s 1/2 turn that will usally solve it.
  18. CO/WV

    CO/WV Been here awhile

    Joined:
    Nov 27, 2008
    Oddometer:
    142
    I am planning on getting a 2012 300.... I live at 9600ft and I am not a mechanic.

    1) For weekends in Moab will it run fine without rejetting 9600ft to 4600ft I assume I would richen the fuel oil mix a bit

    2) of course rejetting is better....... how long would it take your not expert mechanic brother to rejet the bike?
  19. DougZ73

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

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    The KTM..back in its natural habitat...sadly, not for that long.
    [​IMG]

    I just got back from a short test ride. Good news..I made it back. Bad news..I broke the bike. It died coming back on road, two streets away from house. While rolling at speed ...I jumped it going to start it again. It wanted to stall on low end...I did not let it.

    Got it in driveway and thought it was just lack of fuel. Put in on reserves and tried kicking it. Kicked waaay to easy. Hummm compression issue.

    Praying it was a loose spark plug..I pulled the seat and tank to check. Plug was fine. I suspect with the difficulty I had putting top end back together..something was wrong with rings...and they probably broke on ride home. With kid coming ..this shall sit till spring. Ugh. KTM's
  20. HellSickle

    HellSickle Scone Rider

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    "Ugh. KTM's" ?!?!?! Sorry, it sounds like a possible issue with your mechanic. If you had issues getting the rings in place, you should have dashed out to the tool store & picked up a ring compressor.

    I don't mean to be harsh. I've made my share of expensive mistakes. Sometimes the purpose in our life is to serve as a warning to others. :D

    Sometimes I'll tell the story of the CB750F build and the "Llama Incident" :evil