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Found 8 results

  1. I have a 2005 CR250 and it runs really well except for one issue that I've been having over and over again. When I'm on the throttle the bike is responsive and feels crisp, but when I'm coasting down hill or off the throttle in general the bike will out. I've learned to just avoid by working the clutch and keeping the RPMs up, but it increases fatigue and arm pump really fast and it's a bitch during a race. Also, I have great midrange in the power band right now, but the low end could improve, and the top of the power band is very flat. I've pulled the carb apart and cleaned it multiple times, but after awhile the same issue comes back. The float gets stuck and the bowl fills with gas and chokes the bike out. If I leave it in the trailer with the fuel petcock on it will piss gas out of the overflow, and it doesn't like to idle for longer than about 30 seconds unless you're hitting the throttle. I've tried throwing a flywheel weight on so I can ride in single track conditions and get the low end pull but the stalling issue remained a problem. Would it be better to just go with a Keihin carb and run different jets, or does the smart carb really give you a better ride? I'm considering putting a Lectron Carb on there so I can just be done with always trying to rejet the POS Mikuni, and I can freely ride from elevations of 1000ft - 6500ft without dealing with a finicky carb, it's got me pretty annoyed by now. I've heard really good things about the Lectron so far and I'm curious if any of you guys have tried them out? If so what did you think? Do you think it would help get some more low end out of the bike and remedy the stalling out? My skill level is intermediate to advanced, I ride in the Central California area mostly between Carnegie and Hollister SVRA and race District 36. Mostly into hillclimbs, single track, and woods riding.
  2. I recently picked up a 4 stroke KTM 450 and I have been having issues getting the bike to kick start. Upon further inspection I pulled the stator cover off and a ton of fuel came pouring out. After that the bike started no problem but I originally though the issue was with the petcock or float needle so I replaced both of those parts and reset the float height. I also did a pressure test on the float needle and seat to make sure fuel wasn't leaking past into the engine. A few days ago I left the petcock on and the bike flooded again even though the float needle should prevent fuel from passing through the carb. At this point I have no idea what the issue could be, any help would be greatly appreciated.
  3. My 2006 KTM 85 sx isn't starting and believe that the crank is full of fuel or somthing along those lines i have checked for spark and is sparking fine but when i do check the spark plug it is wet after kicking it over a few times!
  4. I just bought it and it was starting up first kick every time, then all of a sudden when I was riding it, it would just bog down after giving it gas and eventually quit. So I thought it was out of gas and put more in. It wouldn't start up so I cleaned the carb out and tried it and it still wouldn't start. When i tried push starting it, it would start up and run as long as I was pushing it but it sounded bogged down still especially if I gave it gas and eventually it would quit when I got too tired to keep pushing it. Choke makes no difference. Seems like theres a good seal around the air boots, so what could this be??
  5. It's just a general question, and me being the maintenance freak I am, I have to ask. Can kicking over a bike that won't start for whatever reason (valves, fuel, etc.) do any damage to the engine? Whether it be via friction, pressure buildup, or whatever. I'd just like to ask because my '02 yz250f wouldn't start and I kicked it over about 200 times today if not more. Finally I figured it out, but could kicking over a bike do any engine damage?
  6. Hey just wanted to post up a problem I had with a hard start issue that I was able to solve. Hope this helps...... This issue would have led many of us carb owners to chase our tails so I feel compelled to share my experience. After a long days ride in Baja mexico just recently, we arrived at our destination of Mikes sky rancho. When I turned my 15,000 mile DRZ400s off for the night it was in perfect working order. The next morning I turned my manual fuel petcock to the "ON" position and proceeded to crank the bike without any luck of it starting. It hickuped and choked and after a long time, and nearly a dead battery, it kicked over and ran great........ BUT every time I tried to re start it, same issue. I did not have this issue at all the previous day. It turns out that it was a leaking float bowl seal flooding the engine causing it to run fine once started but gave me hell when re starting. In the picture below its number 18.....the housing that the needle seal fits into was the part that was leaking. It has a circular o ring. this is what I'm talking about......
  7. Ok this is my first post so please give me a break if I am doing something wrong. I have a 2009 Drz400sm I just picked up recently. It has fmf exhaust, big bore, hot cams, fcr carb, 3x3 mod, raptor petcock, and i'm sure a few other things. I was aware that the bike had a bad idle when I bought it and it would die if you didn't keep the revs up with the clutch in. I fixed the loose throttle cables and it seemed to clear the idle issue up for the first ride after that. Soon after that it started to have a bad idle again. Now the bike will not even start. It turns over but just will not start. I tried to hook up a battery box to the battery and that didn't help. The battery is charged, the spark plug is new and sparking, the air filter looks fine and it seems like it may actually be getting too much fuel because there was fuel on the plug. It was having some overheating issues when it was running and I checked the coolant to see there wasn't much in there. Filled it up with new coolant. I drained the oil the next day and it was creamy colored. I imagine that it was coolant in the oil because the coolant level dropped significantly in the radiator. I checked the valve clearance and intake are over spec slightly. It measured .18mm (.15mm is max spec for hot cam). The exhaust clearance is in spec. I know the intake is a bit out of spec but I don't think that is why the bike isn't starting. Between the milky oil, the rough idle, not starting, valves out of spec, i'm honestly not even sure where to start with finding the issue. I haven't torn apart the carb yet because the guy I got it from said he cleaned it but I am wondering about the jets that are being used. Please if anyone could help me out some it would be greatly appreciated. The starter will turn all day but the motor does not want to turn on.
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