Recent content by sbest

  1. My 380EXC jetting/carb blubbering situation + partial solution

    I am at the opposite end of the scale with a street driven 2000 KTM 125 EXC but I ran into similar problems when I first started running it on the street. It seems street running is much more fussy about jetting than running on dirt ever thought of being. I also have a 300 KTM and an untried 380...
  2. 2004 ktm sx project

    I believe this will work. I had a cursory look at it a few years ago. I've done some stuff with strokers in other 2 stroke engines and typically you just need to shim the cylinder higher with hand cut brass or aluminum base plate gaskets to make up the difference with the head. You may have the...
  3. Ultimate Woods Bike

    I have a 2003 KTM300 and a 2000 KTM125 and a 2004 Husaburg 450. I like the light weight of the 2 strokes far better than the 450 but the 450 is the king of open spaces, wheelies and hill-climbs. The 300 is a bit overpowered in tight woods in my opinion and does suffer from too narrow a gear...
  4. 05 KTM 300EXC Pipe / Tank

    Dang, I have no picture of the right side with the IMS tank on but I remember the problem on my 03 300. Gnarley pipe and big tank, the two touched. I used adhesive foil insulating tape on the bottom of the tank and bent the pipe down all I dared, gaining about 4mm, then by hammering on an iron...
  5. KTM 125sx pilot jet question

    All good advice here guys, but here is my take on the situation as an old guy who has been running 2 strokes since 1974: 1) It is an 8 year old used bike new to you. Leak test the engine to make sure the case, gaskets and crank seals are not leaking. You do this by plugging the intake with a...
  6. What's this?

    Hard to tell, especially because you don't mention the make, model, displacement or year of bike, but it looks like a rubber one-way valve from the power-valve breather. Normally they don't give a problem unless the gearbox is overfilled, the crankseal shot, or a gasket leak has occurred. If I...
  7. Full Throttle

    Bark Busters. If you trail ride you need Bark Busters. With them on your handlebars can become offensive weapons and parking props with no fear. Oh yes. #6 sheet metal screws in the tire lugs. Ride ice without fear. Steve
  8. clutch not releasing

    Yes. How did you hold the clutch basket when you removed the crank gear nut? If you improvised with something on/in/against the basket fins, you may have bent them. Have you tried clutch adjustment at the gearbox case first? Steve
  9. No top end after rebuild

    It would be nice if they'd get back and tell you that it worked....
  10. 95 rmx detonation/pinging

    Wow, you got an awesome answer from Rich. Good stuff. Lots of good answers here. So, for trouble shooting, good rules are to make changes one at a time and when you have a problem, go back to where you knew it was right. Put the old carb back on and try that first. It will answer a lot of...
  11. New Member with a question

    Clean fuel and not letting the carb dry out will keep the jets cleanest, so ride often! The carb does not need to be removed on most MX bikes. Loosen up the cables or remove their cap, loosen the boot clamps and swing the carb 90 degrees, bowl toward you. Often you can remove the bottom...
  12. yamaha dt200 servo motor

    I believe so. My experience was with the 1985-87DT200 so I am just taking a guess here but they are the same generation and Yamaha is not prone to drastic changes on things that work. Steve
  13. Squish bands

    Jaguar, are you the same guy from the McDizzy List? Nice hearing from you. My work has been on 125-300cc KTM, Yamaha and Honda 2 strokes and bike and automotive 4 strokes. I played with squish areas, bowl shapes and volumes, and squish gaps. Results tend to deliver in a "Bell Curve" fashion...
  14. ktm powervalve

    If it was closed all the way you would find a huge difference in power when set up anywhere close. Steve
  15. Did I buy the wrong bike?

    If you are not made of money, you are on the right bike! The 250F and 450F bikes SUCK $$$ when it comes to repairs. A major rebuild, crank, cylinder plating, piston and all (you doing the work) is $1000 at most on a 2 stroke, more than double that on the new 4 strokes. Plus the complication...