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      JUST IN!   04/24/2018

      HOW TO: 4-STROKE PISTON REPLACEMENT DONE RIGHT!

steve lemley

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About steve lemley

  • Rank
    TT Silver Member

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  • Location
    California
  • Interests
    99 street legal WR400 Yamaha
  1. Just got back from a ride after installing the JD jetting kit, air box mod, AP mods along with drilling out the exhaust defuser and all I can say is WOOOOOOOOOOW. Its a different bike. There no hesitation and the bike is as well tuned as anything I have even riden. Ride in So Cal so I used the red needle at position 4 (middle) , installed the 42 pilot and 155 main per JD instructions exactly. Set up for bewteen 3000 and 6000 elv. I recommend this to anyone who has carb issues, bogging or hesitation with this bike. Pick a good afternoon because you are going to have to rip half the bike apart to do all of it but its so worth it.
  2. With so much out there in this price range for what you want to do. I dont suggest a bike that has any serious drawbacks from industry strandard and this bike has three of them. Sorry if thats not what you want to hear, just giving advice from experience. Buy more than you need because as you get more comfortable on it you will start to need the extra you didnt think you would.
  3. Just got back from a ride after installing the JD jetting kit, air box mod, AP mods along with drilling out the exhaust defuser and all I can say is WOOOOOOOOOOW. Its a different bike. There no hesitation and the bike is as well tuned as anything I have even riden. Ride in So Cal so I used the red needle at position 4 (middle) , installed the 42 pilot and 155 main per JD instructions exactly. Set up for bewteen 3000 and 6000 elv. I recommend this to anyone who has carb issues, bogging or hesitation with this bike. Pick a good afternoon because you are going to have to rip half the bike apart to do all of it but its so worth it.
  4. 280 pounds for a 250?????
  5. Read the instructions, they are very straight forward.
  6. Both me and my friend got them when they first came out. Moved them at first and then we both have different problems and both out batterys ended up going dead. And yes...... They were installed correctly. I was a big supporter until the problems all started.
  7. So i got the JD kit and it looks like it comes with mains, needle and the third one I dont know, maybe a pilot. My question now it what is the third one in the JD kit? I have many jets here and am trying to fingure out if the JD kit will take care of everything or I should change any others while Im in there. Plan for tomorrow is to do the JD kit, adjustable fuel screw, the AP mod and any others that anyone suggests by the time I tear the bike down in the morning. Thanks again for all the input guys. It really helps.
  8. The elevation and riding temps are listed above in the orig. posting. Thanks again.
  9. I ran carb cleaner through the carb to ensure there was no built up resin in the carb and after talking to osme of the 250X gods, this bikes jetting is flawed with this problem from stock. Heres what I plan on doing while I have the carb off. Accel Pump Mod, CCC mod, JD jetting kit, fuel screw. Did I miss anything? Thanks again guys for all the help. When I get the carb off I will post the stock jets and what I changed them to. Im not a fan of posting a new thread unless needed so hopefully this posting will then help the next guy in my exact situation on the exact same bike.
  10. I tried the carb cleaner and although Im sure the carb needed it, it didnt solve the problem. Okay so AP mod, CCC mods, JD jetting kit is what I plan on doing while the carb is off the bike. Did I miss anything? Thanks again for all the help guys.
  11. Dont know the stock jets but the jets are stock. Dont know the position of the fuel screw but I did try moving it out a half turn and no help. JD kit will come very soon but wanted to get it running without it at first.
  12. I read threads for hours and couldnt find any advise specific to this issue on this bike. In hopes of helping the next guy that has this exact issue for this bike I thought it was worth a posting to give details on this exact issue and not general advise for carb help. So red rider, you think it's just old gas that has resined up and is cloging the carb? This is great news, I was not looking forward to tearing the whole back end of the bike off to fix it. I will try this tonight and let you know how it goes. Any other advise or suggestions on a jetting, clip position change, etc? Thanks again in advance for the help.
  13. I have always owned and ridden the blue bike but bought my dad a 2004 250X. The bike is a california bike with 20 hours on it and COMPLETELY stock and I dont think the previous owner did anything but put gas in the bike and change the fluids (he did have it serviced and valves checked 9 months ago. Thats it). The bike has a bad bog in the throttle when you wrap it at medium to fast speed in neutral or in gear. It will roll okay on the throttle if I do it slow but other than that its BAD. Knowing the old owner did nothing to the carb, I can assume all the jets and settings are stock. I plan on doing the CCC mods later but would like to get it running good at the stock settings. Any advise on jetting changes to solve this issue would really help. I have never had this mid throttle bad bog before and could use some advise. Specific jets to use, change or reconfigure would really help. As you all know getting to the carb is not easy or fast and I would really like to get a winning combo together so I am confident that when I put the bike back together, it will run great and I wont have to tear it apart again. Live in So cal at about 2000-3000 elev. and an average of 50 to 80 degrees during riding season. Thanks in advance for all your comments and help.
  14. I have always owned and ridden the blue bike but bought my dad a 2004 250X. The bike is a california bike with 20 hours on it and COMPLETELY stock and I dont think the previous owner did anything but put gas in the bike and change the fluids (he did have it serviced and valves checked 9 months ago. Thats it). The bike has a bad bog in the throttle when you wrap it at medium to fast speed in neutral or in gear. It will roll okay on the throttle if I do it slow but other than that its BAD. Knowing the old owner did nothing to the carb, I can assume all the jets and settings are stock. I plan on doing the CCC mods later but would like to get it running good at the stock settings. Any advise on jetting changes to solve this issue would really help. I have never had this mid throttle bad bog before and could use some advise. Specific jets to use, change or reconfigure would really help. As you all know getting to the carb is not easy or fast and I would really like to get a winning combo together so I am confident that when I put the bike back together, it will run great and I wont have to tear it apart again. Live in So cal at about 2000-3000 elev. and an average of 50 to 80 degrees during riding season. Thanks in advance for all your comments and help.