Kawasaki Dirt Bikes Forum

2001kx125

the guy who sold me my bike said the previous owner had an aftermarket pipe on the bike but had reinstalled the stock one becuase the aftermarket was scratched/banged up.

the bike ran like crap sputtering and bogging

i moved the clip on the needle (that goes into the jet in the carborater) from the bottom most (most gas) position to the middle and it ran better but still some sputtering/bogging, so i moved it to the 2nd from the top and it ran good.  

the bike has a pro circuit silencer and pro circuit stickers so when i went to pick a pipe i got the pro circuit works pipe.  

i got that on and moved the needle clip back down to the bottom most position and it ran like crap again, the position i settled on was the middle, (1 down/more gas than it was on before i put the header on).  

I was under the impression that a pipe/expansion chamber did alot for a bike and if you couldnt get enough gas by moving the needle all the way down, you would have to "re-jet" it with a bigger diameter jet and correspondingly thicker needle.

Does this small of a change in carborator seem normal???  

Your not makin sense cowboy. You leaned the needle and it ran better. A pipe will not make that big of a difference, that you have to move the needle clip to the richest position.

Jet your bike according to how it runs the best w/out jetting too lean.

Moving the clip one position on your needle jet can make a big difference in your bikes performance.  
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Nobody's gonna hurt anybody. We're gonna be like little Fonzies here. And what's Fonzie like? Come on what's Fonzie like?

circuit stock   recommended by pc
main jet 360 370
pilot jet 50 45
needle position 4 2

and your way off. changing the main jet does not mean that you have to change the needle. i have heard of htis before and i have no clue where this came from but it is false. this is at sea level around 65 degrees. these setting may or may not help but they are a base to start at and it really depends how its running at deferent throttle positions.  
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Ride 2 strokes, buy 2 strokes, save the 2 stroke.

1998 cr125
2002 cr80

sorry if im not making sense it is my 1st bike

someone told me that a pipe would add somewhere in the area of 5 horse to my bike and that stock the bike should be around 25 horse which would be a signifigant gain.

i thought that the pipe would suck alot more air and that would cuase me to need more fuel. alot of people said that i would have to rejet the bike if i got a different pipe which i thought meant a wider jet which i thought would then need a wider needle but heard today that you only put in a wider jet and use the same needle

so i thought that moving the needle up would kindof do the same thing as putting in a wider jet, maybe im wrong there though.

i wonder why the guy had the needle all the way up  

i dont know if it will add that many ponies  
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ridin the dirt and the pow

Maybe Shetlands but not horses!  
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Needles have different tapers and clip positions. They do not get wider, that I'm aware of.

Install the pipe and see how it runs, before you change anything.


See if the jets you have are the ones elko listed.  
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Nobody's gonna hurt anybody. We're gonna be like little Fonzies here. And what's Fonzie like? Come on what's Fonzie like?

a works pipe will add maybe 1 hp. all pipes do is change the power band. and check to see what jets you have in right now.  
______________________________
Ride 2 strokes, buy 2 strokes, save the 2 stroke.

1998 cr125
2002 cr80

I've yet to see a pipe that required more than a small change in the airscrew and MAYBE 1 size different main (rarely at that).

On any 2-stroke built after around 2000, the HP difference is typically under 1.5HP on the dyno and commonly less than that/ As elko said, it moves the power around but does not necessarily make more.  
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Here we go again!

ok thanks for the replies/info, 2 more questions,

1 why do you think the guy would have had the needle that far up.  I remember taking it to a friend of a friend who "knew about dirtbikes" when the needle was all the way up becuase it was sputtering and not running good for me. He jumped on it and did a wheelie down the street through all the gears, no sputtering, ran like a champ

2 what can i do to add more HP?  

who knows what that guy was thining i had some wild ass pilot jet in my carb and skip couldnt figure why that was in there also there wasnt a gasket on the reed cage no gasket on the exhaust port heck the dude that owned the boke didnt even know how to make it idle.......
now you have to go through your bike and check everything to see what this guy screwed with

As for getting more ponies sell the 125 and get a 250 2 stroke i meen you can get a v force reed but that really just moves the powerband and leingthens it a bit  then of corse port and polish but that can get expensive
What i did was just learned how to use my bike better then the guys on the 450fs and 250 2 strokes they are impressed when they have a hard time keeping up with the lil cr125. Just work on your skill  
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ridin the dirt and the pow

i dont know why people have this fascination about giving there bikes more hp. getting more hp will not make you faster actually most people would be faster if there bikes were slower.  
______________________________
Ride 2 strokes, buy 2 strokes, save the 2 stroke.

1998 cr125
2002 cr80

i think its because ppl like and always want MORE power  
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ridin the dirt and the pow

yes except they would go faster if their bikes were slower. do you realize that the bikes are already detuned from the factory. people cant use the full power that the bike can put out. they need practice not more power.  
______________________________
Ride 2 strokes, buy 2 strokes, save the 2 stroke.

1998 cr125
2002 cr80

i couldnt agree more more power gets a new rider into trouble much faster then a bike that has sufficient power  
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ridin the dirt and the pow