Then I repacked my muffler (it didnt even have hardly any packing left!).
I took off my pipe (it had like a quarter inch of buildup) and sandblasted the inside and got all the crap out.
#ATC 250R EXHAUST FULL#
Which one or ones are you having trouble with? The main jet affects 3/4 - full throttle.įirst of all let me tell all of you guys I really appreciate your help. Second problem, it can be rich on idle, transfer, midrange or wide-open. I had to greatly lower my fuel level and run a 132 main. Those carbs tend to run very rich from float problems. It is, and may have nothing to do with jets.įirst problem - float. I understand it fine but still screw up in my applications sometimes.
#ATC 250R EXHAUST TRIAL#
Takes a little practice and trial and error. What you need to do is understand exactly how it works and then just figure out what your trike needs.
#ATC 250R EXHAUST MODS#
Every trike is going to be a little different due to different mods and location/atmospheric conditions. I was goofing it up until Kasey pointed out my error.īottom line is, nobody on here can tell you exactly what you need to set your jetting/needle/pilot/airscrew at. Mine was bogging at mid throttle so I needed to richen it up with the needle clip. A sputter is a little bit different but you have to get pretty far off before it's obvious what's wrong. A bog sounds like the way it does when it's running out of gas. I was feeling it cut out around mid throttle and just assumed it was rich because it feels similar to a main jet that's too rich. I screwed up at the dunes and went the wrong way with my adjustments. It's hard to tell the difference between a bog (lean) and a sputter (rich) until you run into both. Remember, tightening the air screw will restrict air flow which makes it richer and vice versa. The stock pilot jet will most likely be fine (it works in conjunction with the air screw so you can fine tune it that way instead of changing the jet unless it's way the hell off). Needle clip position and air screw are going to be the two circuits that have the most impact on how it runs at anything less than full throttle. It's possible to have your main jet the perfect size and still run way too rich or lean at anything less than wide open throttle. The main jet effects everything past 1/4 throttle to at least some extent so it's important to figure out which main to run before doing anything else.Īfter you get the main dialed in, you can do some half throttle plug chops but you can really tune it by ear at that point. A lean condition that doesn't manifest itself in performance can still fry your top end.ĭo that first. Unfortunately, it's possible to run lean with no outward symptoms which is why you need to do plug chops instead of just going by the way it's running alone. If it's sputtering kind of rapidly at wide open throttle, it's rich. You can also tell by how it's running to confirm what the plug is telling you. Get it wide open, hold it there for a few seconds and in one motion pull in the clutch and kill the engine and coast to a stop. The only way to check the main jet is by testing it at wide open throttle. How do you know it's running rich? Are you doing proper plug chops? You're not giving enough information. They can get clogged up full of all kinds of crap.Ĭlean out the carb paying special attention to the jets. You can clean out the air intake the same way as the pipe. Replace the baffle packing too.Ĭheck your air filter and air intake (if you're running with the airbox lid on). Your bikes and location have next to nothing in common.Ĭlean out the pipe. What works for you in the California desert isn't what's going to work in Indiana. hold on tight and watch the crap come out. go to a quater car was.stick nozzle in the big side.
i would even possibly put a whole new carb rebuild kit in it. Go one down in the clip position and to to a 37 pilot.
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