Carb and Jets

Jaime · 07-29-2008, 04:11 PM

Im new to the site and to motorcycles. I see alot of people talking about carbs and jets. I want to know when would i need a bigger or smaller jet? What am I looking for in the engine's performance in order to know if i need a bigger jet or smaller jet? How do I know when to look at the jet? How does changing the Airfilter effect jets? When Do I need to mess with the Air fuel mixture? I know it alot of questions and theirs alot of experience floating around here and would get some knowledge droped on me. Great Site!

katoranger · 07-29-2008, 04:23 PM

If you keep your bike stock you will not need to change the jet unless you live at sea level or high elevation were there would be a slight chance that you may need a smaller or larger jet.

On the stock bikes it has been found that they run lean from the factory for most people. You can correct this be moving the c-clip on the carb needle toward the pointed end. Also adjusting the fuel screw to about 2 turns out helps. These two things help with starting/idling/revving in stock form.

If you decide you want to run a pod filter like a UNI or K&N you can probably get away with the stock jet yet. When you go from the stock exhuast to a more open exhaust and the pod filter is when you will need to rejet to a larger main jet in the carb.

I have a UNI filter and a pretty much open exhaust on my bike. I moved from the stock 98 jet to a 108 main jet and could probably go a bit larger.

The torque is improve, but the bike is loud above 5500rpm.

Allen

Jaime · 07-29-2008, 04:35 PM

So when I have less restrictive exhaust go with a larger jet. Change to an aftermarket Airfilter, get new jets. Got it. What about adding things like a performance CDI would that have an effect on the jets? Again, thanks for the advice.

katoranger · 07-29-2008, 07:37 PM

The CDI has proven to be more of a race only type item and not really a daily rider type mod.

The exhaust and airfilter will gain you more.

Allen

07-29-2008, 04:11 PM	#1
Jaime Join Date: Jul 2008 Location: Charleston,SC Posts: 49	Carb and Jets Im new to the site and to motorcycles. I see alot of people talking about carbs and jets. I want to know when would i need a bigger or smaller jet? What am I looking for in the engine's performance in order to know if i need a bigger jet or smaller jet? How do I know when to look at the jet? How does changing the Airfilter effect jets? When Do I need to mess with the Air fuel mixture? I know it alot of questions and theirs alot of experience floating around here and would get some knowledge droped on me. Great Site!
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07-29-2008, 04:23 PM	#2
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	If you keep your bike stock you will not need to change the jet unless you live at sea level or high elevation were there would be a slight chance that you may need a smaller or larger jet. On the stock bikes it has been found that they run lean from the factory for most people. You can correct this be moving the c-clip on the carb needle toward the pointed end. Also adjusting the fuel screw to about 2 turns out helps. These two things help with starting/idling/revving in stock form. If you decide you want to run a pod filter like a UNI or K&N you can probably get away with the stock jet yet. When you go from the stock exhuast to a more open exhaust and the pod filter is when you will need to rejet to a larger main jet in the carb. I have a UNI filter and a pretty much open exhaust on my bike. I moved from the stock 98 jet to a 108 main jet and could probably go a bit larger. The torque is improve, but the bike is loud above 5500rpm. Allen __________________ You meet the nicest people on a Honda Clone.
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07-29-2008, 04:35 PM	#3
Jaime Join Date: Jul 2008 Location: Charleston,SC Posts: 49	So when I have less restrictive exhaust go with a larger jet. Change to an aftermarket Airfilter, get new jets. Got it. What about adding things like a performance CDI would that have an effect on the jets? Again, thanks for the advice. __________________ -Jaime The Citadel LF200GY-5
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07-29-2008, 07:37 PM	#4
katoranger Join Date: May 2007 Location: Altamont, Kansas Posts: 15,103	The CDI has proven to be more of a race only type item and not really a daily rider type mod. The exhaust and airfilter will gain you more. Allen __________________ You meet the nicest people on a Honda Clone.
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