badbanshee01 Posted January 10, 2006 Report Posted January 10, 2006 Hi, I recently installed fmf fatty pipes and removed the air lid. I moved the clip to the 4th position and installed a 290 main. It starts right up and idles good but it feels rich in the midrange and lean up top. When I cut my plug apart after a wot run, there is about a 2mm thick line on the base of the porcelin, but it is very light color and you can barely see it. However, the plug is entirely black on 3/4 of the porcelin closest to the electode. I have searched and what my plug is telling my is main is way lean and my mid is pretty rich. Correct me if I'm wrong. Hopefully I can get this jetting done Quote
Banchetta Posted January 10, 2006 Report Posted January 10, 2006 Hi, I recently installed fmf fatty pipes and removed the air lid. I moved the clip to the 4th position and installed a 290 main. It starts right up and idles good but it feels rich in the midrange and lean up top. When I cut my plug apart after a wot run, there is about a 2mm thick line on the base of the porcelin, but it is very light color and you can barely see it. However, the plug is entirely black on 3/4 of the porcelin closest to the electode. I have searched and what my plug is telling my is main is way lean and my mid is pretty rich. Correct me if I'm wrong. Hopefully I can get this jetting done 457763[/snapback] Are you still running the stock filter??? Also, why do you think its rich in the midrange.....Hesitating before powerband?? or is it breaking up? Do you have aftermarket reeds or stock? Also have you adjusted the air screws to best throttle response? Try .5 turn out, 1.5 turns out, then try 2.5 turns out..see which one is better. Answer ALL these questions, we can get it for you. Quote
badbanshee01 Posted January 10, 2006 Author Report Posted January 10, 2006 I beleive it is rich in the midrange because the end of the porcelin is black. Also, the midrange is running really rich i believe. It doesn't have good throttle response until the throttle is nearly wide open. I have the air screw at 1.5 but that should only effect low rpm's. It fires up good and idles fine and is OK to a quarter throttle, but not perfect.I may try 1 turn in I guess but I don't know if that will make a big difference. I believe I have to put the clip back in the middle position to make it about right and then get a bigger main. Quote
Banchetta Posted January 11, 2006 Report Posted January 11, 2006 I beleive it is rich in the midrange because the end of the porcelin is black. Also, the midrange is running really rich i believe. It doesn't have good throttle response until the throttle is nearly wide open. I have the air screw at 1.5 but that should only effect low rpm's. It fires up good and idles fine and is OK to a quarter throttle, but not perfect.I may try 1 turn in I guess but I don't know if that will make a big difference. I believe I have to put the clip back in the middle position to make it about right and then get a bigger main. 457772[/snapback] Don't let it fool you...fmf pipes like a rich needle and will pull harder before powerband...if you running stock reeds, then I'd try the needles in the 5th clip...just try different settings and you'll feel the difference..plug readings on the needles is worthless. The black porcelain tells you nothing...my porcelains are jet black.....after a year!!! As for the air screw, it WILL make a difference on response..try .5 turn out, then 1.5, then 2.5...Do a big change to feel the difference, then fine tune...I find fmf shees to like the .5 turn out better here in New England, but I jetted a shee in Glamis and it liked to be at 2.5 turns out, so just try both...Just remember you can get some decent low end back w/ jetting, but those pipes do sacrifice low end from stock pipes....fmf gnarlies, pt mids have better low end... Quote
Hilarious Posted January 11, 2006 Report Posted January 11, 2006 I have fmf fatties, k&n, no air box lid and v-force3 reed cages. Im runnin 340 mains, 27.5 pilots, middle (stock) position on the needles and my air screws are 2 turns out. Sounds llike you need bigger main jets. I'd change one jetting circuit at a time. Go bigger on your mains then go from there. Quote
badbanshee01 Posted January 11, 2006 Author Report Posted January 11, 2006 The biggest main jets i can find are at magic racing and the biggest is 320's. Do you think I could get them from a dealer? Or anyother online store? thanks Quote
Hilarious Posted January 11, 2006 Report Posted January 11, 2006 Clicky here Go there. Dennis Kirk has em up past 320 and they are 6 bucks a pair. Quote
badbanshee01 Posted January 14, 2006 Author Report Posted January 14, 2006 (edited) I finally got some 320 jets and I started tearing my quad down. I found something very scary When I took the slide out of the carbs ( the thing that goes up and down with the throttle that holds the needle) I noticed that I had the left switched with the right And, they were turned 180 degrees so the curved edge was to the front, and not the back. Anyways I corrected this and put in the 320's and left the clip on the 4th spot and turned the air screw to 1.5. It fired up nice and ran 3 times as better as before After about 10 minutes of hard riding I did a wot plug test. After this I took out the plugs and they were just about all white except for the middle porcealin of the plug. However, if I would have held the throttle longer they would have been all white I believe. So, this means that I have to step up to yet another size. What size do you think I should get? Should I try moving the clip to the 5th place even though it runs pretty strong their now? It runs really good everywhere right now so I would keep it like it is, but my wot test told me to go up so I guess I have to? Thanks alot for all the help you have gave me Edited January 14, 2006 by badbanshee01 Quote
Banchetta Posted January 15, 2006 Report Posted January 15, 2006 What color was the tip of the plug? Not the porcelain, but the "finger" or ground strap. The outer circle should be black, while the tip should be brown...as for the 5th clip, just try it...it'll either pull like a train right from the bottom or it'll fall on its face.. you'll know!!! Quote
badbanshee01 Posted January 15, 2006 Author Report Posted January 15, 2006 What color was the tip of the plug? Not the porcelain, but the "finger" or ground strap. The outer circle should be black, while the tip should be brown...as for the 5th clip, just try it...it'll either pull like a train right from the bottom or it'll fall on its face.. you'll know!!! 459570[/snapback] What is the ground strap or finger? is it the metal piece that does a 90 degree bend over the electode? Quote
2003LimitedBanshee Posted January 15, 2006 Report Posted January 15, 2006 What is the ground strap or finger? is it the metal piece that does a 90 degree bend over the electode? 459588[/snapback] Yes it is the piece that the center electrode fires to. As Banchetta was saying, you can really tell what you need to know by looking at this. Quote
Banchetta Posted January 15, 2006 Report Posted January 15, 2006 What is the ground strap or finger? is it the metal piece that does a 90 degree bend over the electode? 459588[/snapback] Exactly, that is the ground strap. Also known as your temp guage....lol. Too lean will make your shee run hot which will turn the ground strap light tan, really lean will melt the tip of the plug and your pistons... , your pipes are designed to run peak hp at 1200 degrees...if your strap is black, then your rich since the motor is running a lot cooler and can't burn all the fuel...you want a chocalate brown color....this makes it to the point where your burning all the fuel, but not getting too hot.....the outer circle outside where the threads are should be black, as you look up the ground strap, you want the color change to be at the 90 degree bend and turning to chocalate brown or dark brown.... Quote
badbanshee01 Posted January 15, 2006 Author Report Posted January 15, 2006 The ground strap is a fairly dark brown color(more black than brown) and it change color right in the middle of the bend, which is right. It is black halfway up the bend but then it changes to a slightly lighter black color(almost getting to dark brown maybe?) I did a wot throttle test at the end of the day yesterday and there is a light brown color on the porcealin at the bottom of it. You are supposed to have a 2mm brown ring here so I may be a little lean on the main I believe. Also I tried the 5th clip and it seemed to run a little worse than it did in the 4th. It seemed a little rich. I wish I could post a plug pic. but I don't have a website.It is running excellent everywhere but I may try one bigger on the main jsut to be safe. Thanks alot banchetta for all of your help through this. Oh, and one more thing. I slightly bent a jet needle while removing the carbs today so I tried to bend it back and got it pretty close. I put it back in and it ran fine so do you think I have to replace it? Where would i buy another one? Thanks again Quote
Banchetta Posted January 18, 2006 Report Posted January 18, 2006 The ground strap is a fairly dark brown color(more black than brown) and it change color right in the middle of the bend, which is right. It is black halfway up the bend but then it changes to a slightly lighter black color(almost getting to dark brown maybe?) I did a wot throttle test at the end of the day yesterday and there is a light brown color on the porcealin at the bottom of it. You are supposed to have a 2mm brown ring here so I may be a little lean on the main I believe. Also I tried the 5th clip and it seemed to run a little worse than it did in the 4th. It seemed a little rich. I wish I could post a plug pic. but I don't have a website.It is running excellent everywhere but I may try one bigger on the main jsut to be safe. Thanks alot banchetta for all of your help through this. Oh, and one more thing. I slightly bent a jet needle while removing the carbs today so I tried to bend it back and got it pretty close. I put it back in and it ran fine so do you think I have to replace it? Where would i buy another one? Thanks again 459858[/snapback] If the tip is black or slightly off black, then you might want to try one size smaller....your very close though....if temps get colder, then your good, if temps get hotter, then you'll be rich...one jet size for every 15-20 degrees, I jet my shee for 60 degrees out and run it between 50-90 degrees out w/ no change... don't look at the porcelain, the needles will change that as well as the pilot..the timing will also affect the porcelain...as for the needles, they have the most affect right before powerband...a lean needle will make the shee hesitate before powerband and a rich needle will tend to make the shee break up especially when riding trails where you are constantly in the 1/4-3/4 throttle range... Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.