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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
Can't get cr125 started
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[QUOTE="keithb7, post: 1116047, member: 58846"] If the plug is black there is most definately an air/fuel mixture problem. This is almost always caused by improper sized jets in the carb. The jets need to be properly matched to the amount of air flow entering in through the carb. Air quantity will be affected by it's temperature, humidity and altitude above sea level. (another controllable factor that affects air flow is a very dirty air filter on the bike). Another symptom of improper A/F mixture is the black splooge spewing out the exhaust pipe. When you cleaned the carb did you take note of the numbers stamped on the pilot and main jets? If so, post them here so we know what you have in there. It is quite probable that your hot, or warmed up engine aids in the combustion of the A/F mixture. That is why the bike seems to run fine once it is warmed up. Think of a diesel engine, it is very very difficult, sometimes impossible to start when it's in sub zero temps. A hot diesel engine easily starts. The warmed A/F mixture burns easier. A diesel has no spark plug where your bike does, I am just using this as an example to show where warmed fuel ignites easier. Make sure your air filter is clean, there's not bird or rat's nests in the air box, then work your way into the jetting. Think about the flow of air from when it enters your bike through the filter all the way through your carb, reeds and intake ports to the cylinder to where it is compressed and ignited. Once the A/F mixture ignites, the spent gases need to exit the cylinder through the exhaust port. If they don't the bike can't suck in enough new fresh A/F mixture. Then is runs like crap, sputters, hard to start, etc. That is why there have been suggestions to check the power valves in the exhaust side. If the power valves are not functioning properly, the spent exhaust gases can't escape. There is only so much room in the engine, and it needs to be filled with as much fresh A/F mixture as possible. So getting the exhaust out is important. I hope I didn't confuse you. My intent was to try and explain so you can trouble shoot and hopefully find the problem. Check the jets and get back to us. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
Can't get cr125 started
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