Question about kawasaki KX 125 Motorcycles

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1995 kx 125 rattling

I have a 1995 kx125 that we just replaced a few things on. Got new seals everywhere, new exhaust system, cleaned air filter, replaced carb, and person we bought from said he just redid the bottom end. When ever I am riding, in 3rd and 2nd gear it seems to rattle in the front of the bike. It sounds like it is coming from the engine, not the tires or anything. It seems to only come sometimes though, at a certain speed it seems to run perfect, but other times it rattles alot. Also in first gear it feels like the gears are off, like its not running right. Could anyone give me a suggestion to this problem.

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Seems like somethjing foreign could have been forgotten in the transfer case. this most likely is causing the rattle, when the viberation from the motor reaches a certain pitch or frequency.. best to have it checked by a pro...

Posted on Nov 12, 2009

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Posted on Jan 02, 2017

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I was out riding my kx 125 and the engine just died. It won't start and the engine just backfires. It has plenty of gas and the oil is good too. Checked spark pllug and it was fowled and wet. Cleane


for kx125, that kind of problem i kind of remember my friend just like that too. so clean everything inside . so u have to changes the valves and also the lifter then do the piston pin too,.also chick the rod if in good! that's it for now then when u do that tell me what going on!

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1 Answer

2003 Kawasaki KX 125 Sputters at high RPM


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1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
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If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
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1 Answer

My kx125 2002 has a funny rattle when idleing on the magneto side


Take the cover off the magneto side by undoing the 8mm bolt/screw heads around the cover. Hold the magneto firmly and try and move up and down, if you sense any movement that isn't rotary it may be your main bearing that needs replacement, this sounds like a rumble rather than a rattle when the engine's running.
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1 Answer

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It sound like its just the seal in the casing through which the drive shaft emerges.Straight forward job to replace. (Workshop manual for your bike can show you step by step)

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its prob your magnito with out a good connection to magnito it wont spark at all,could also be spark plug wire



My bike,
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The reed valve assembly should hold solvent withot leaking. Remove for test. Disassemble and clean reeds and reed seat. Perfect seal is very important.

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I had a similar problem, so maybe I can help you. it can be connected with air filter. under your seat there should be some kind of cover on the air filter. just remove it. I've noticed this problem when I unrestricted my KMX 125. the hole on the cover on the air filter is too small.

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