Need way more top end.

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NCrider26

Member

Jun 24, 2007

4

0

• Jun 24, 2007

• #1

I just picked up a 2003 CR125 and I rode it today and the motor kinda sucked. It did not have any bottom and not alot of top. I really want more top, I don't care about the bottom end that much. It has a pro circuit exhaust and silencer. What can I do to get more top end?

 

R

rushy08

Member

Jul 17, 2006

235

0

• Jun 24, 2007

• #2

Get your bike properly jetted mate, atm i doubt it would be.

 

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NCrider26

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Jun 24, 2007

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• Jun 24, 2007

• Thread starter
• #3

rushy08 said:

Get your bike properly jetted mate, atm i doubt it would be.

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I adjusted the air screw, but I am thinking of going one richer on the main jet.

 

Rich Rohrich

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• Jun 24, 2007

• #4

NCrider26 said:

I adjusted the air screw, but I am thinking of going one richer on the main jet.

Click to expand...

Air screw straight to the main jet, sounds like a logical jetting sequence.:whoa:

 

N

NCrider26

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Jun 24, 2007

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• Jun 24, 2007

• Thread starter
• #5

Rich Rohrich said:

Air screw straight to the main jet, sounds like a logical jetting sequence.:whoa:

Click to expand...

No, he asked if it was jetted, I said I adjusted the air screw and it runs good and clean on the bottom. I want to go up on the main jet for some more top end.

 

Rich Rohrich

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• Jun 24, 2007

• #6

Yeah, it must be me who doesn't get it. ;)

 

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NCrider26

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Jun 24, 2007

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• Jun 24, 2007

• Thread starter
• #7

Rich Rohrich said:

Yeah, it must be me who doesn't get it. ;)

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Wait are you making fun of me again...LOL, but anyway will going up on the main help my problem?

 

S

sixds

Member

Mar 25, 2007

779

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• Jun 24, 2007

• #8

the clip on the needle affects mixture from idle to half throttle. main jet affects mixture from half throttle to full throttle.

 

Rich Rohrich

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• Jun 24, 2007

• #9

NCrider26 said:

but anyway will going up on the main help my problem?

Click to expand...

Until you assess the engine condition, the power valve function, and a few other things, you won't even know what your problem is, let alone know if a main jet change will help.

 

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rushy08

Member

Jul 17, 2006

235

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• Jun 24, 2007

• #10

take the bike apart, to a top end if you need too. It could solve all of your problems right there. Give both the carb and the powervalve a good clean out. Then, if the problem still persists, move onto jetting.