Airbox queries

[evro]

Hey guys. I've got a 2000 with K&N filter, DG exhaust, and V3 reeds. I just picked it up a few months ago and have only recently been getting out on it. I noticed that it seemed to be getting too much fuel. She'd bog just before the powerband and then after a few seconds (clearing the cylinders i expect) it would take off, but still not with the power it should. Last night i decided to take the lid off the airbox to see if breathing better would help and holy fuck, what a difference. Thats how shes meant to run...no hesitation and easy wheelies. My buddy who has been on it once or twice for short little bursts said he couldn't believe the difference. Like a whole different machine now he says.

 

What i'm wondering is how much of a difference there is with jetting between running with the airbox in tact, or with no lid? I know it should make a difference in performance, but i wasn't expecting the performance gains that i got. Are jetting modifications necessary between running with/without the lid (i guess it stands to reason cause you are changing the air:fuel mixture?), or should i be trying to figure out if theres any other problems?

 

I havent been into the carbs yet to see what its running for jets, but i plan to this weekend along with new plugs and recharging the K&N. I'm at 1600-1700 ft above sea level running stock carbs on pump fuel. What would you guys suggest i be running for the carb setup?

 

Thanks guys, Ev

[Hilarious]

Hey guys. I've got a 2000 with K&N filter, DG exhaust, and V3 reeds. I just picked it up a few months ago and have only recently been getting out on it. I noticed that it seemed to be getting too much fuel. She'd bog just before the powerband and then after a few seconds (clearing the cylinders i expect) it would take off, but still not with the power it should. Last night i decided to take the lid off the airbox to see if breathing better would help and holy fuck, what a difference. Thats how shes meant to run...no hesitation and easy wheelies. My buddy who has been on it once or twice for short little bursts said he couldn't believe the difference. Like a whole different machine now he says.

 

What i'm wondering is how much of a difference there is with jetting between running with the airbox in tact, or with no lid? I know it should make a difference in performance, but i wasn't expecting the performance gains that i got. Are jetting modifications necessary between running with/without the lid (i guess it stands to reason cause you are changing the air:fuel mixture?), or should i be trying to figure out if theres any other problems?

 

I havent been into the carbs yet to see what its running for jets, but i plan to this weekend along with new plugs and recharging the K&N. I'm at 1600-1700 ft above sea level running stock carbs on pump fuel. What would you guys suggest i be running for the carb setup?

 

Thanks guys, Ev

 

your new bike may have been jetted for no lid and the previous owner may have just threw it

on there prior to sale. you will not know until you dive into those carburetors to see just what

size jets are in there. there is a considerable amount of difference when removing the air box lid.

what do your plugs look like now that you have been riding without the lid on? You may be lean.

id say you should be somewheres in the vacinity of a 300 main jet with aftermarket pipes, k&n

and no lid on the air box.

 

 

 

[Sammy]

I have similar mods with just a little bit more stuff. My elevation is 600ft where I ride and my jet are 320 main 27.5 pilot needle on the 3rd clip air screws at 1.5 turns out from fully closed.

[evro]

I'm think i'm going to buy a second set of new plugs and try the plug chop test on Saturday. Simple, straightforward, and cheap......

[Ducman]

Yup, probably jetted rich with the lid off and now its really rich with the lid on. +1 on the mains size should be around 300.