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MxRacerZach

2003 kx 125 help, advice, tips, and info?

12 posts in this topic

hey im pretty new to TT my last bike was a 2002 yz 125 but had to sell i now have the money to get another bike and i rly like the 03 kx 125's i rode my friends and fell in love i was just wondering if anyone had any input on these thanks

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First of all, the 125 is entirely new from the ground up in 03'. Even the engine was designed from scratch. The frame is entirely new. It has new wheels, and several new components, such as new rear brake master cylinder, new rear swingarm, new reed design, new carburetor (Mikuini TMX "Kai" -- the bore is tapered from 38mm to 40mm, and features a unique throttle slide shape), the rear hub is new, the ignition is new, the airbox is new (with increased volume and straighter intake tract), and the clutch is new. Believe it or not, this just scratches the surface on the changes to the 125.

Design goals for the KX125 included a more compact chassis, lighter weight and more, broader power. Kawasaki also claims a lower center of gravity for the 2003 KX125. Overall, the KX125 is six pounds lighter, and should feel much smaller, as well. Reversing a trend for modern motocross bikes, the seat height is more than one inch lower. The mid-section of the bike (see picture below of the 250 -- sharing the same mid-section) is also much slimmer.

Kawasaki is staying with a six-speed transmission on its KX125, realizing that many customers use the bikes for more than just motocross.

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First of all, the 125 is entirely new from the ground up in 03'. Even the engine was designed from scratch. The frame is entirely new. It has new wheels, and several new components, such as new rear brake master cylinder, new rear swingarm, new reed design, new carburetor (Mikuini TMX "Kai" -- the bore is tapered from 38mm to 40mm, and features a unique throttle slide shape), the rear hub is new, the ignition is new, the airbox is new (with increased volume and straighter intake tract), and the clutch is new. Believe it or not, this just scratches the surface on the changes to the 125.

Design goals for the KX125 included a more compact chassis, lighter weight and more, broader power. Kawasaki also claims a lower center of gravity for the 2003 KX125. Overall, the KX125 is six pounds lighter, and should feel much smaller, as well. Reversing a trend for modern motocross bikes, the seat height is more than one inch lower. The mid-section of the bike (see picture below of the 250 -- sharing the same mid-section) is also much slimmer.

Kawasaki is staying with a six-speed transmission on its KX125, realizing that many customers use the bikes for more than just motocross.

+1 to what you said!

i love my 6th gear on my 125 :thumbsup: i blow everyone away in speed :smirk:

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I love mine as a trail bike.However the carb\motor design is flawed for trail use. When you go down steep grades while idling it likes to load up.

Iv'e done ALL possible changes to get rid of this irritation,(so i don't want to hear,"did you rejet or adjust the float"?) .

The next thing i might try is different reeds. But other than that,i can go out on a track and hammer or hit the trails all day.(with the larger tank)It's been a great bike!

This is the from the last trail ride.The trail starts at the river in the bottom and the 125 had no problems with that climb.In fact the 450s i was with boiled over.

DSCN4980.jpg

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yah i dont do that much trail ridin g i get that out of my system in the snowmobile season i like tracks and racing for dirtbiking

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hey just to let u guys know im picking up a 03 kx 125 with some pretty nice mods for 1800 on friday thanks for the help

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nice, i hope u like it, i have a 2003 kx125 too, i love it.. im the only guy that has one in my town lol the rest of the guys have hondas lol, man its nice to see there faces when i pass them haha

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I love mine as a trail bike.However the carb\motor design is flawed for trail use. When you go down steep grades while idling it likes to load up.

Iv'e done ALL possible changes to get rid of this irritation,(so i don't want to hear,"did you rejet or adjust the float"?) .

The next thing i might try is different reeds. But other than that,i can go out on a track and hammer or hit the trails all day.(with the larger tank)It's been a great bike!

This is the from the last trail ride.The trail starts at the river in the bottom and the 125 had no problems with that climb.In fact the 450s i was with boiled over.

DSCN4980.jpg

Great photo! Is that the Salmon River?

I know what you mean about the four strokes boiling over. My smoker never boils even on climbs like that.:thumbsup:

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Great photo! Is that the Salmon River?

I know what you mean about the four strokes boiling over. My smoker never boils even on climbs like that.:thumbsup:

It's the Deadwood river ridge trail.

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