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JayMartin

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About JayMartin

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  • Location
    Colorado
  1. That wasn't too bad. I tapped the hole out to 7 (from a 6) with the same thread pitch, cleaned the tank out of any shavings, installed a new bolt with a copper washer, and buttoned things back up. Jay
  2. Okay thanks. I hope getting the tank off isn't too difficult so that I can tap a bigger hole. Jay
  3. I just purchased a 2007 YZ250F and have been rapidly going though it. One surprise is finding the bolt at the front of the oil pan stripped by a PO. I've had a WR250F, but this is new to me. What is the purpose of this bolt? Thanks, Jay
    New to this bike.
  4. 0 comments

    New to this bike.
  5. Model (YZ or WR 250F): 2005 WR 250F Timing (WR-YZ): WR Main jet: #158 Pilot Jet: #42 Fuel screw (turns out): 1 1/4 Needle model/Clip position: OCEMP with clip in 4th groove from top Airbox lid (on or off): Cut holes in right side of airbox plus removed air filter cage screen Pipe: Yosh Altitude where you ride: 10,000' to 12,600' Temperature where you ride: 60's Other mods: Free mods, 12/52 gearing Degree of satisfaction: Very satisfied after a long process of finding the correct setup to finally have power above 12k' Interesting observation: At near WOT, the #162 main would peter out about 11,500' and the #160 would only take me to 12,000'
  6. What about if you have a plate? I am unfamiliar with these areas, so perhaps my question makes no sense. Jay
  7. Hi, I would like to ride up behind Montezuma tomorrow (8/2) if I can find someone to ride with. I can tailor the route from pretty easy to difficult depending upon skill level and preference. You should probably have a plate. Let me know, Jay WR250F (plated)
  8. Okay then, if I understand what you are saying, once I have the correct pilot jet, measured by turns out of the fuel screw, any mid-throttle sputtering is likely needle taper. Thanks, Jay
  9. Oh wise ones, The short of it: How do I tell the differences caused by the pilot jet size from the needle taper? The long of it: I have moved to Colorado from NH and continue to struggle with getting my carb to where I want it. The bike is a 2005 WR250F with free mods and a Yosh pipe with a dbDawg stuck in the end to quiet her back down. She runs okay, not perfect, until very steep and above 11,500’. Last time out she was running out of power completely to the point where I had to slip the clutch and paddle. I have been methodically making and then testing changes by running up and down a stretch of paved road that goes from 9,500’ to 12k’ (Loveland Pass). I have gotten to the following setup but still have traces of stumbling mid-throttle. The last two changes I made were going to a #45 pilot which increased stumbling and then switching from the JD Red needle to an OCEMP (both with clip in #2 groove from top). My perception is that with the OCEMP, the stumbling cleared up in the lower portion of mid-throttle. (After reading more about needle design, I now know that I need to be more discerning about differences between 1/8, 1/4 to 1/2, and 1/2 to 3/4 throttle. I’ll try to do that and document each range my next time out.) I have spoken online with two different people who say they got their WR’s running strong above 12k’. Below is how our setups compare (Man, how do you do a table in this editor?): Bike: Mine 2001 2006 Main: 160 160 160 Pilot: 42 42 42 Pilot air jet: 70 72 ? Leak jet: 40 40 68 Needle: OCEMP OCFKP ? Clip from top: 2nd 4th ? Fuel screw: 1 1/4 2 1/2 ? Observations and next step The road up Loveland Pass isn’t near as steep as where I ran out of power. So my current testing methodology has its limitations. I’ll go back to that troublesome spot once I have a riding partner again for in there as I don’t like to ride off road alone. I am going to first try dropping the pilot jet to a 40 to see if the entire mid-throttle will just clean up. If not, I suspect I have to learn more about needles. One riding buddy says that I should not seek perfection for getting a 250 to run smoothly at that range of elevations. Rather I should get it to a tolerable place and say, “Good enough.” What say you all? Specific questions Does trying next the #40 pilot make sense? Any thoughts on upping the pilot air jet? Some local mechanics didn’t even think my bike had one although the manual says it does. And perhaps most importantly, how will I know that I have the best pilot jet and then know I have more work to do with needle taper? If you are still reading, thanks, Jay
  10. My understanding is (except for riding above 6,000') one chooses a pilot jet to end up with between 3/4 to 2 1/2 turns out. By that rule-of-thumb, you are at the far edge of "correct" and could try the next bigger pilot jet. Jay
  11. I plug my bikes into trickle chargers whenever they are parked at home and have found this to prolong battery life. An auto parts store may be able to test your battery for you. Jay
  12. Okay and thanks for the replies. Jay
  13. Thanks for the reply. I think I will also try to contact Acerbis directly. Jay