Question about 2003 Yamaha YZ 125

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Not running right stalls almost wants 2ed gear no balls

Need advise

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Could be a whole bunch of things. make sure you have a good clean tank of gas, a clean air filter, and a fresh spark plug are just a few basic items that can cause such an issue. i would also suggest buying a spark tester. you just clip it on the engine somewhere and connect the plug wire to it, and when you kick it over you can check the intensity of the spark. also i would remove and clean the carb just too make sure that there is no sludge built up and blocking the jets or keeping the float from sticking up. another thing to check is the compression. you can buy a compression gauge at some auto parts stores, or tool department. the reading should be around 130-150. if you have low compression then you could have bad rings, blown headgasket, bad valves or something else along that line. also remove the exhaust and make sure no critters are stuck up in there because if you cant get proper exhaust flow it wont run properly.

Posted on Jan 13, 2009

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Sorry for my English I have a 2012 TRX 450R It runs well in neutral. As soon I try to clutch, it stalls right there. I try in different gears and it always stalls.


I fixed your English. It sounds as though your clutch is badly adjusted. You pull the clutch in and then when you put it into gear, the engine is directly connected to the wheels without the clutch working. You can test this. With the engine off, put the gear into 1st gear, pull in the clutch and listen to whether the engine is turning over. If it is, the clutch needs adjusting. You adjust right from the lever, adjust the cable so there is barely any play at rest. This forum might help you better. http://www.trx450r.org/forum/95-maintenance/123331-clutch-adjustment.html
http://www.trx450r.org/forum/95-maintenance/123331-clutch-adjustment.html

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1 Answer

I have a 99nighthawk 250cc cbx. That stall when put in gear. I've disconnected the kjckstand witch but still stall when put in gear. Starts & runs fine while in nuetral can someone plz. help ?


Pull the clutch lever in and see if there is any resistance. If it has little or no resistance at the lever, it has air in the line(if hydraulic) or the clutch cable needs adjustment. The clutches are probably not fully disengaging (dragging)which could be why it turns off when placed in gear.

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My 1990 kx 125 stalls after about 5 mins of riding....it bogs down through the gears and stalls


is the compression good on your engine have you checked and cleaned the carb out also are you running the right pre mix ratio about 32:1 which is about 156 ml oil to 5 litres of petrol

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In 4th and 5th gear at full rev seems like


If it is hard to start after it stalls, it is probably getting too much fuel. Could be dirt in the float valve. Also try running a hotter spark plug

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1 Answer

Engine stalls when engage in any gear from neutral.


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You probably know this but... when you put it into gear you don't have your kickstand down do you. There is an automatic shutoff on the kickstand.

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