After about 15 kicks my bike starts runs for about 2min. with choke on then it shuts off verry abrubtly almost sounds like it seized it shuts off so fast.jump on it kick it again first kick really hard after that it kicks normally and it does same process all over again
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the wiring or components are worn causing resistence--getta repair manual for the detailed tests----------also when at home run an electric fan at motor when stopped--it cools it fast and gives air cooled engines 3 times the life span
Run some carburetor cleaner through the system to remove any dirt which may be interfering with the carbdiapharms............Let idle for 15 to 20 min before trying acceleration.........Hope this helps you out.
first drain the carby, then set your air mixture screw 2 turns out, from the fully turned in position. The starting proceedure is as follows, when the engine is COLD, turn on fuel, pull on the choke fully, and kick the engine over. DO NOT use any throttle, when the engine is cold, and the choke is on. Remember Choke on, NO throttle. When warm, no choke, and a little throttle when kicking.
Check your spark plug. If it is not all black, it should be ok. If it is, replace it. Reinstall new plug, Kick it full choke no throttle. Let it run for 15 secs with the choke on. Shut the choke off while reving it. If the bike will not idle, clean the carb. Chaz Moto DC
The choke should only be used when starting cold. After the bike is warmed up you can turn the choke off. If it keeps shutting off after being warmed up for a few minutes, then check your gas/air ratio for the idle air mixture knob. Loosen it up 1/4 turn to allow more gas to flow.
There is a proper way to start the engine. Four controls are on your bike to assist in starting.
The choke, used when the engine is cold. Pull the red knob for choke.
The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
The de-compression lever, always used.
The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.
I have a crf 250 R and i have learned multiple things about these bikes like if you leave it running and not riding it for about ten min. it will over heat. they love race gas 113 octane,and alot more. but your prob sounds strange. i know if you hold the hot start while its runing it pops that could be a problem. or it could be you are not cleaning the bike out i would need to know more about this to give a definate answer but try going over the bike. Look at key parts like the carb air cleaner fuel line any thing that is nesessary for the bike to run.