Question about Aprilia RX 125 Motorcycles

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Bogging out when giving full throttle - RX 125 Aprilia Motorcycles

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Hi Anonymous, I am sorry you can't find the first and best tool you ever bought for your Aprilia but despair not for a mere $10 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day.
http://www.apriliaforum.com/forums/showthread.php?134481-Carb-Setting-Engine-Bogging-Down
Dirt Rider Magazine
UPDATED 2005 YZ125 bog issue with videos https://www.tradebit.com/filesharing.php/search/0/aprilia+rx+125+motorcycles

Posted on Oct 23, 2015

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Posted on Jan 02, 2017

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SOURCE: Bogging engine 3400-4000 RPM under full throttle.

Sounds like one of the intermittant jets is clogged. Need to clean the carbs.

Posted on Apr 30, 2009

  • 99 Answers

SOURCE: yz 150f bogs when you give full throttle all at once

ok, assuming you replaced the carb header and stator with aftermarket parts, then I would say you definitely have a jetting issue. that flat spot is coming from your engine starving for fuel. its taking the gas too long to get from the carb to the engine. you would fix this by adjusting the idle mixture on the carb. the first thing I would do is look for the fuel mixture screw on the carb. im not familiar with your specific model. but the screw is usually found facing down on the bottom of the carb, directly in front of the bowl. when you find it, turn it counter clockwise about 1/2 turn at a time until that flat spot fades away. if that doesnt work, then you will need to up the size of the pilot jet inside the carb. maybe 1 or 2 sizes would be enough. if you replaced the carb with a bigger carb, then you may not be able to fix this problem. in my experience, larger carbs will increase power, but usually throttle response, especially low end, suffers considerably. the reason for this is lower intake velocity and vacuum. basically, with a bigger carb it takes a second longer for the fuel to be drawn from the carb and properly atomize with the air. hope this helps.if I overlooked anything let me know! some more info on the engine/modifications and carb/jet sizes would help too. good luck.

Posted on Sep 06, 2009

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Go back to the carburetor adjustment screws and snug them down gently. Do not use force on those screws or you'll damage the needle valve seats. Turn both screws out one and a quarter turns out and start the saw. The motor should stay running.... if not adjust the screws until it stays running. Turn one screw in until you hear the motor start to stall, then turn that screw out just a little bit. turn the other screw in until the saw starts to stall, then turn that screw out a little bit. Now if the saw bogs at full throttle, turn one screw out one quarter turn. See if the saw runs at full throttle... if not turn that same screw in to where it was and try the other screw the same way. If you're good, you can adjust the screw while the saw is running to get the best full throttle run. This is not an exact science, and it takes time and many adjustments to get the saw to idle and run at full throttle. Good luck... and have patience.

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Hi, Trent and the usual suspects are:
1. Inlet system air leak.
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