Jetting

[jonnyrebel2004]

I have a 2000 Banshee that I am having Eric Gorr do a woods port job on. I have a K&N air filter with an outerwears and no air box lid. I have an FMF Power Core II exhaust system. I have a cool head with 20cc domes. I had the flywheel lightened and the timing advanced to +4. I am at about 1000ft. and am going to try to run AV fuel which is 104 octane. If I dont like how it runs I may change to a higher octane fuel. I am getting ready to rejet the carbs and I need to know where to start. Any help is greatly appreciated.

 

Thanks Travis

[richybanshee]

First ask the people of EricGorr for advice on the setup and type of porting.

 

Try 360 - 380 mains and see how it runs. (porting changes things a lot)

GOOD LUCK

[Banchetta]

I agree, Eric Gorr should be the first person to ask...also we need to know what kind of carbs your running....

[jonnyrebel2004]

Im running my stock carbs.

[Banchetta]

I would start w/ a 320 mains and go from there...Gorr would have a better idea though..porting is more finicky when it comes to jetting, it'll vary more from one builder to another.

[jonnyrebel2004]

Gorr said that porting wouldnt change the carbs that much, but I am also increasing my timing to +4 and had my flywheel lightened, so what would you guys say I should change to?

 

Thanks Travis

[Banchetta]

Gorr said that porting wouldnt change the carbs that much, but I am also increasing my timing to +4 and had my flywheel lightened, so what would you guys say I should change to?

 

Thanks Travis

320501[/snapback]

Really....thats surprising, I'd start w/ a 300 main, needle 4th clip from the blunt end, stock pilots and go from there..

[jonnyrebel2004]

300 or 320's? You said 320 in your other reply. I have rejetted it once and changed the needle clip position but I dont know to what and I may have changed the pilot, I will just have to pull the tops off the carbs and take a look. He did say that porting would make it richer so I could lean it down a little. So you still thinking what you said earlier or what?

 

Thanks Travis

[Banchetta]

Usually porting will make you lean so you have to go larger on the mains, that's why I suggested to start at 320, but if Gorr said it shouldn't change much, then start w/ a 300 main...Rich is always safe, it'll only cost you the price of the jets, which you'll need later in the future anyways..so its up to you. Drop in the 300 's and do a wot test for 5-10 seconds in 6th gear, shut if down, coast to a stop and check the plugs, they will tell all....of course, wait till you have at least a tank of gas through it before you open it up for that long..

Edited February 11, 2005 by Banchetta

[FIRST BANSHEE]

also, if it won't pull sixth gear and feels lazy or like it's laying down, your probably lean. don't run it out that way. jet up and try again.

[jonnyrebel2004]

On the WOT test do you have to chop the plug or will I be able to tell by just looking at it?

[jonnyrebel2004]

?????? anyone?????

[hamuel]

WEll with basicly the same mods i ran a 320 4clip 30 pilot. and mine was perfect. a stock pilot seems a little small to me seeing i could get her to start cold with a 25 just piped. but like every one else said every bike respones different. It's always better to start with in the ball park but on the rich side of things. Expecialy when yah just had her rebuilt. Just looking at the plug after a good like ride will tell you what your bike is running on avrage if it's lean rich or right on. But that's just the curcit that you normaly ride in. I could when yah hit WOT be lean or way rich seeing yah don't ride there much. Me I take a nice used plug and make sure i know what it looks like before i start a wot. THen when done remove it and look at it. It should Either stay the same color or darken up or lighten up. Every one says something different about how to do a plug check to. so your going to have to make up your own mind on how to do that.

[richybanshee]

First of all... What size of main jets where you using before porting? No matter what the size, you need to put bigger jets, NOT smaller than before porting.

 

Eric should have at least an idea of the size, based on the type of porting they do. If a lot is taken off the cylinders then more air will be going in and you have to put bigger jets to compensate. Since Eric told you that his porting will not change jetting a lot, asking to give you an idea of the size, they must have had this question asked many times.

 

Do not know your altitude, or temp, but you have some mods that make your shee run hotter like advancing timming and compression, with porting you will have more air going in so if I where you I at least consider 340 mains, down size if needed. Better to be rich than because of a damaged piston. Happended to me once, I did not cried but was mad as hell. Then $$$$ for a new piston.

 

Another option:

If you had, let's say 280 before porting.... try 300-320... if needed down size.

 

At 1000 feet from sea level, temp 70-90 farenheight, around here we run shees with 280-320 mains depending on pipes, and some of the mods you have mentioned with porting we go bigger on the mains.

Edited February 15, 2005 by richybanshee

[jonnyrebel2004]

Ok guys here is what I got: I have 320 mains, 30 pilots, and the needle on the 4th clip from the blunt end. This is how it was jetted with v-force II reeds, a k&n filter with no air box lid, an FMF Power Core II exhaust system, and a Noss Cool head with 20cc domes. The mods I need to rejet for are +4 timing, lightened flywheel, a Gorr woods port job, and a brand new set of Weisco piston and rings. I will say this that I think it was running rich when it was jetted this way because it smoked. Based on this where do you guys think I should start.

 

Thanks Travis