How to decide what jetting options?

[pizzleboy]

I've got the Cobra F1 pipe, ignition advancer(although I don't think that matters) and K&N filter on my 2002.

It backfires like crazy.  How do you decide if you need stage 1/2/3?

I would hate to buy the wrong one then realise I should have purchased a larger set.

Perhaps a breif explanation of what the terms mean.

[Piper5177]

If you remove the airbox it is stage three.  If you use a stock replacement filter it is a stage one.

[pizzleboy]

it is the stock K&N filter replacement.

does te fact that the F1S is practically a straight through pipe make any difference?

[pizzleboy]

incidently, how do you remove the airbox?

[mes_423]

i have a k&n pode filter and a stage one kit. is that a bad combo?

[The Buddha]

Its the right setup...
Cool.
Srinath.

[miket]

Usually Dynojet suggests stage 3 with pod filters. Give them a call, they will suggest what's best for you.

[The Buddha]

i have a k&n pode filter and a stage one kit. is that a bad combo?

Sorry I was looking at the POst from pizzle boy and hit reply...
K&N pods and no air box = stage 3.
40/150/3/1-2 washers...the hell with a jet kit...I talked to a guy that bought the DJ jet kit and it did nothing but make him cry...He put in the stock needle and it was instantly better. He says smooth taper is the only way to go...The DJ needles have abrupt and wildly varying tapers and are very hard to get right. I tend to agree...smooth taper is gradual and linear and only way to go.
Cool.
Srinath.

[pizzleboy]

Getting confused.

K&N filter(not pod, stock K&N replacement filter) and F1S pipe.

Should I not purchase a jet kit then?  Only purchsed the washers/needles etc?

Or should I just take it to local shop and get them to decide what is best?

I'd hate to pay lots and still be frustrated.

[The Buddha]

Getting confused.

K&N filter(not pod, stock K&N replacement filter) and F1S pipe.

Should I not purchase a jet kit then?  Only purchsed the washers/needles etc?

Or should I just take it to local shop and get them to decide what is best?

I'd hate to pay lots and still be frustrated.

OK you are ideally in stage 1 territory. But the hell wiht a kit...I am still doubting if the kit is any good...I have it and am experimenting with it. You could do the 125/40/1-2 washers/3 turns thing. Buy unit jets...cheaper than the kit even at its discounted $25+10 that K&N sells it for nowadays and will make it run a whole bit better.
Cool.
Srinath.

[Blueknyt]

he is saying, Buy the size jets you need, depending on conditions where you live, #40 pilot jets/ anywhere between 130-140 mains, about 3 turns out on mixture screw and 1-2 .5mm washers under the stock needle to raise it alittle.

Nothing is gonna be absolute gospel, weather here in fla is diff from NC, and more so then Denver, humidity,average air temps, Altitude ect ect.

the # 40 pilots are a given across the board, this is part of idle mixture and i believe low RPM power range like 2-4K rpms, just off idle

washers are needed, but you have to be happy with 1 or 2 (this is part of midrage adjustment)


the mixture screws work in conjunction with pilot jets for idle mixture when the throttle plates are completely closed. this runs anywhere between 2-4 turns out, on whole  2.5 - 3 turns seems to be what most folks run.

the Mains, this is where taking your time and being patient is gonna pay off. ask Srinath, im sure he has pulled jets many times to get the right combo for each of his bikes. thankfuly they are cheap.


again, its a guide, ballpark idea.  in zone kind of adjustment. it is not a dead nut 123 setup.

[The Buddha]

Getting confused.

K&N filter(not pod, stock K&N replacement filter) and F1S pipe.

Should I not purchase a jet kit then?  Only purchsed the washers/needles etc?

Or should I just take it to local shop and get them to decide what is best?

I'd hate to pay lots and still be frustrated.

OK a canadian bike already has 40 pilots...one less thng to trip you up. I'd try and see if the brass plugs are taken out of the air screws, and see what mains it had stock in the manual...cos if it had 125's you probably should try it as it...I forget what it had.
Cool.
Srinath.

[miket]

He has a 2002. None of these recipes above will work for you because the carbs are different. See Pablo's site for rejetting the >2000 models.