To much air??

[wilcoxmike]

I made my own intake out of PVC pipe and looks great for being home made. But im having a terrible time adjusting it. i have went from 160 all the way to 180 and the 180 runs the best but it seems like it hits the rev limiter from about half to full throttle. With a smaller jet it happens even worse. my quad is all stock except for the intake i made. could i be getting to much air??? Im running out of ideas ive moves the needle air screw still cant dial it in.

[LEOGM5150]

what kind of atv? what kind of mods. what other jetting, needle, pilot jet, fuel air screw? help me help you.

[Bruce!]

Welcome to the board!

[wilcoxmike]

I have a 07 Polaris predator bone stock just a intake I made. I purchaced a FMF jet kit so I replaced the need jet with the FMF needle right now it's se nod from the top and I'm running a main jet of 180 right now be cause that's the only jet that runs the best as of right now. I drilled out that plug and turned the fuel air screw 3 turns out. I didn't change any thing eles in the carb.

[LEOGM5150]

if you have the stock exhaust on even with an after market intake you are too rich with a 180 jet. the fmf kit is dynojet which i like a lot. you will not even need a 180 after you get it openly flowing with the open intake and free flowing out with a good open exhaust.

i think you have an air leak of some kind. bone stock with just an intake should be around 155.

your needle is lean if you have it on the 2nd notch from the blunt end of the needle. i would go to the third notch from the blunt end of the needle. then lastly you need to get to the fuel air screw or pilot screw. it should be at about 2.5 to 3 turns out.

JETTING STARTING POINT FOR ANY PREDATOR OR OUTLAW WITH THE FUJI 500 ENGINE, WITH A AFTERMARKET PIPE AND FILTER NOT IN THE STOCK AIRBOX. 170 MAIN JET, 4TH NOTCH DOWN FROM THE TOP OR BLUNT END OF THE NEEDLE AND 3 TURNS OUT ON THE AIR/FUEL SCREW, THE STOCK PILOT JET IS ENOUGH UNLESS YOU CANNOT ACHEIVE A GOOD EVEN IDLE AT 3 1/2 TURNS OR LESS WITH THE A/F SCREW. THIS WILL WORK WITH DYNO OR MIKUNI JETS. I RECOMEND DYNOJET JETS AND NEEDLES, I FOUND THEM TO MAKE BETTER POWER IN THE MIDRANGE.

THESE SETTINGS ARE ON THE RICH SIDE YOU WILL NEED TO LEAN OUT YOUR JETTING ACCORDING TO YOUR ENGINES FUEL AIR NEEDS, ALTITUDE, TEMPERATURE, HUMIDITY, MODIFICATIONS. AGAIN THIS IS A STARTING POINT TO GET YOU ON THE RIGHT TRACK.
if you still have the stock exhaust these jetting settings will be very rich for you.

[wilcoxmike]

I'm going to get a exhaust soon anyways so I'll put that on and try it. With how restrictive the intake was I wanted to free it up lol. When I got to a 180 I know something Wasnt right so I needed to get on a forum and ask some questions. Thank you Appreciate it.

[wilcoxmike]

Would a slip on be ok until I get the header for it?

[joshr08]

dont waste your money on a header the stock header on the predator flows more then you will get into or out of your motor.

[wilcoxmike]

What's a good slip on that isn't to much?

[joshr08]

do you want to spend a little to get some sound or do you want to buy a slip on that you wont want to replace in a week or two because you didnt get the power you were hoping for