Overboost Posted March 12, 2009 Report Share Posted March 12, 2009 my question, why are some slide needles longer than others. I dont need the sarcasm answers like genetics and crap like that. should the tip of the needle show through the jet bottom when the bowl is off? given both needles are set in the center clip poistion, why are some needles longer. aftermarket? Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted March 12, 2009 Report Share Posted March 12, 2009 You use a longer needle when you need to adjust the clip position leaner but dont have any slots left to adjust. So you install a longer needle and reset the clip position to the middle. Quote Link to comment Share on other sites More sharing options...
Overboost Posted March 12, 2009 Author Report Share Posted March 12, 2009 from all the posts I been reading, sounds like the stock short needles are the way to go. I am only running pipes and pods, +4 coming this summer. thats it. so stock needles and 320 jets, problem solved. I just have handfuls of carb parts here, trying to get it all tuned in the first time, so all I have to do is fine tune. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted March 12, 2009 Report Share Posted March 12, 2009 from all the posts I been reading, sounds like the stock short needles are the way to go. I am only running pipes and pods, +4 coming this summer. thats it.so stock needles and 320 jets, problem solved. I just have handfuls of carb parts here, trying to get it all tuned in the first time, so all I have to do is fine tune.Wait tell you get a pair of keihins and you have 50 or so different needles to chose from, Start changing lenght, taper and diameter. Quote Link to comment Share on other sites More sharing options...
AKheathen Posted March 13, 2009 Report Share Posted March 13, 2009 from all the posts I been reading, sounds like the stock short needles are the way to go. I am only running pipes and pods, +4 coming this summer. thats it. so stock needles and 320 jets, problem solved. I just have handfuls of carb parts here, trying to get it all tuned in the first time, so all I have to do is fine tune. i have 310's, and IMO the stock needles suck in the low range Quote Link to comment Share on other sites More sharing options...
Overboost Posted March 13, 2009 Author Report Share Posted March 13, 2009 i have 310's, and IMO the stock needles suck in the low range let me poise this question then, if I used the longer needles, will I be able to use my jets I have currently, or will I have to put in the jets that fit them needles? I been reading that the 270 jet for these needles are not the same as a stock replacement 270, it is acually bigger? is this true, if so is the 270 equal to my 320 or is it just some old 270 jet? Quote Link to comment Share on other sites More sharing options...
Powerstroke Posted March 14, 2009 Report Share Posted March 14, 2009 I was being careless and bent one of my stock needles. So I bought the aftermarket needles that FAST sells and I am very happy with them. Jeff hooked me up with jets and said nothing about the longer needles requiring different jets. Quote Link to comment Share on other sites More sharing options...
2003LimitedBanshee Posted March 14, 2009 Report Share Posted March 14, 2009 let me poise this question then, if I used the longer needles, will I be able to use my jets I have currently, or will I have to put in the jets that fit them needles? I been reading that the 270 jet for these needles are not the same as a stock replacement 270, it is acually bigger? is this true, if so is the 270 equal to my 320 or is it just some old 270 jet? A little confused by this post. No, if you upgraded pipes, filter etc. you will need to rejet your carbs, NOT simply change out needles. Needles or sometimes referred to as metering rods. Their purpose is to make the smooth transition through the middle RPM range and meter in the main jet until you are at WOT. Needles can vary in length, diameter, taper etc. all of which serve different purposes. A longer, more gradual taper needle will take more throttle before allowing the main jet to flow fully. A blunt, shorter needle will provide a more abrupt transition to WOT. IMO a longer more tapered needle allows me to really dial in the mid-RPM range and provide a strong pull from just of idle up to WOT. Quote Link to comment Share on other sites More sharing options...
Overboost Posted March 14, 2009 Author Report Share Posted March 14, 2009 ahh, that makes more sence.. and no, I was not trying to see if could simply change needles instead of rejet.. I wanted to know if, when I rejet, should I use the longer needles or stock. what is the advantage of the two. with my pipes and pods, I have it jetted at 320 now, and wanted to know if I should use stock needles or the longer ones. sorry for any confusion. Quote Link to comment Share on other sites More sharing options...
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