Need way more top end.

[NCrider26]

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?

 

[rushy08]

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

 

[NCrider26]

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

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

 

[Rich Rohrich]

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

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

 

[NCrider26]

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

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]

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

 

[NCrider26]

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

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

 

[sixds]

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

 

[Rich Rohrich]

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

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.

 

[rushy08]

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.