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Trailryder42

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  1. Trailryder42

    my xr died today...I think

    What do you mean, you noticed the decomp on the head wasn't moving? It's not supposed to move unless you pull the manual decomp lever on the handlebars.
  2. Trailryder42

    Best battery for an EXC300

    Fits my 300xcw with no modifications to the box. It's a tight fit tho, height-wise, as it is a little taller battery. I rerouted the positive cable to come at the battery from the rear to keep the seat pan from contacting it. If I had to do it again tho, would probably spring for the Antigravity or similar.
  3. Trailryder42

    XR400 Jetting Recommendations

    I'm not sure how much leaner the CA needle is compared to the A16A needle. Whether it's a clip, half clip, etc.. Most of the jetting suggestions you'll get are based folks experience with the A16A needle. A lot of CA folks will upgrade to the A16A as part of doing all the engine, exhaust and airbox mods like yours has. 16012-KCY-681NEEDLE SET, JET $26.08 Over the years, I've found mine runs/performs better at 10k and over when I drop the needle to 2nd from top. Otherwise, I leave it in the 3rd position all the time. If I leave it in 3rd for those high elevations, it still runs fine, just a little blubbery. I don't like that tho, which is why I'll take the time to retune whereas someone else might ride it as is. Like I said earlier, for a wide range of elevation I may expect to be encountering, I'll jet the pilot in such a way that I can adjust rich/lean with the fuel screw as elevation changes start to effect throttle response. The main can be swapped on the trail by loosening the carb clamps, rotating the carb and removing the bowl plug, a 5 minute job. Once you determine what runs good for you at different elevations and conditions, write them down in your shop manual. Until then, carry a selection of main/pilot jets and related tools with you. I've had my XR for 18 years. Any more, it seems like the only tools I carry are a plug wrench and a 2 stroke spark plug.
  4. Not to mention the rest of the broken valve guide breaking up, coming out and trashing things again. You're having to replace the valve. Why you wouldn't buy a new guide and install it at the same time is a mystery.
  5. Trailryder42

    86 xr250r engine questions

    I'd say, the first thing to do is check the parts fiches to see what OEM parts are still available. That will tell you what you're going to have find from other sources, like parts bikes, eBay and such. https://www.rockymountainatvmc.com/oem-schematic/2 New bearings can usually be matched at your local bearing retailer. There are piston kits all over the web. Get the engine apart, see exactly what kind of shape it's in, what you need. That info will help others make suggestions later.
  6. Trailryder42

    my xr died today...I think

    If you left fuel in the float bowl after the last time you rode it, the fuel has turned bad and the jets and for sure the fuel screw/screw passage are gummed up/occluded. You need to pull the float bowl, both jets, fuel screw, it's spring,washer and oring and blow some cleaner thru them. I'd do that before anything else.
  7. Trailryder42

    XR400 Jetting Recommendations

    In my experience, all those jetting combos are off. Too rich, especially 4 and 5. To stay within reasonably acceptable/optimal jetting for an elevation, you should rejet for every 3000'-3500' change in elevation. For your mods, setup and home elevation I'd go with 158/58. It will rich at 6200' but that's better than too lean. You could try jetting for the middle, between home and that 6200' with a 155/55 and it will run better at 6200' but might be lean around home. Given the type rider you say you are, not riding on the main(3/4-full throttle), you could run 158/58 and drop the needle to the 2nd from top. That would allow the engine to run not quite so rich as you go up in elevation since it sounds like you'll spend most of the time in the needles throttle range. Then lean the fuel screw to adjust for off idle response- up to 1/4 throttle, as you need to when going up in elevation. Trying to come up with one jetting combo for a wide elevation range of 1625'-6200' without being too rich at one end and too lean for the other is difficult to the point of being unrealistic IMO. Especially for a 7000' change in elevation range as in example 4 and 5. If that's what you want to do, it's just going to take some jetting experimenting on your part to see what you can get away with. If you use my jetting rule of thumb, change jetting for every 3000'-3500' change in elevation by 1 jet size, you can figure what will be close for any elevation, starting with your home elevations jetting. I live at 3600', have all of your mods and run 155/55 up to around 7000', depending on weather conditions, before thinking about rejetting. If I know my riding is going to be spent at and above 10k, I run 148/48, so you can see, with our mods, the jetting in your example 5 is way to rich for that elevation. One other thing. Calif. models have a different needle than the other 49 states. When you get your carb apart, check your needle code. It will be stamped. A16 is Calif. and A16A is everyone else. The Calif. needle is leaner, so your 3rd from top position is leaner than my 49 state needles 3rd from top position. Hope this helps.
  8. Trailryder42

    Best battery for an EXC300

    Something like the premium Antigravity battery is becoming the go to, after the OEM battery has gone bad. Those type batteries are said to have better longevity and definitely way lighter. Usually need a charger with the special circuit for charging them too, as your normal lead/acid chargers won't work. If you decide to not spend that kind of money tho and you stick with a lead/acid type, go with the more powerful YTX5. Stock is YTX4. The 4 is barely adequate.
  9. Trailryder42

    Extended Air Fuel Screw

    I agree, it's easy enough to modify/extend the stock screw with a little imagination and ingenuity.
  10. Trailryder42

    Lighting issue on 96 XR400

    They are connected to two wires coming from the stator. Pink and yellow.
  11. Trailryder42

    Avaliable skid plates xr400

    I think the Moose plate is still available and fairly inexpensive. Tho, your Devol has always been highly regarded and not easy to find. I think I'd keep what you have.
  12. Trailryder42

    2 stroke exhaust not sitting correctly

    I agree, it's fine. The orings make the seal, not the pipe being square in the outlet.
  13. Trailryder42

    Bogging out in 2nd 01 XR400R

    What was the air filter on it before you swapped back to the UNI? You swapped in the UNIs cage with it too, right? If you had the stock setup in it, filter and cage, then swapped to a UNI, that will lean out your air/fuel ratio for your current jetting, because the UNI flows better. I can only speculate on how that exhaust might be flowing. Who did the carb rebuild? What's your elevation? Do you know it's current jetting? What do you mean by "lacking top end"? Not enough speed at WFO or it won't pull/no power in the upper throttle range? Still stock 15/45 gearing?
  14. Trailryder42

    Bogging out in 2nd 01 XR400R

    So there's no baffle or anything inside that muffler can? Did the elevation change from where you bought it, to where you live? So it wasn't doing this until your ride this morning? I would be checking your jetting. Sudden symptoms like yours can be caused by a jet that has fallen out. But until you rule out some things, cause could be almost anything.
  15. Trailryder42

    Carb Tubing

    Usually when you have fuel running out the overflow, it's an indication that the float level is set too high, you have a piece of trash between the needle and seat, the slosh baffle has come off and is hanging up the float, or the float/needle valve itself is sticky/hanging up on its own for some reason. While it's overflowing, take a screwdriver handle or the like and firmly tap on the float bowl, see if it stops. If not, something about your reassembly/float setting is off.
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