jetting with k/n +race can
jetting with k/n +race can
finaly managed to get some standard carbs ,my question is this which main jets do i fit .ive got a k/n filter and a viper race can ,old carbs dynojetted(ruff as f***)so ime putting back to standard ime thinking 132?? ime in uk standard is 125 1/4 and 122.5 2/3 pleas help icarnt lift the front wheel <!--EZCODE EMOTICON START :o --><img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"><!--EZCODE EMOTICON END--> <!--EZCODE EMOTICON START :o --><img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"><!--EZCODE EMOTICON END--> <!--EZCODE EMOTICON START :o --><img src=http://www.ezboard.com/images/emoticons/embarassed.gif ALT=":o"><!--EZCODE EMOTICON END--> <p></p><i></i>
- creed12r
- Help!!! I need a LIFE!!!
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dynojet
Dynojet list DJ132 for K&N with race can, E-clip on needle position 3 (middle position) little washer in top of e-clip, I'm using a stage 3 kit so I can't say how good this base setting is but it won't be far off.<br> chris <p></p><i></i>
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jetting
go back to stock jetting...132's are WAY too rich<br>Jim <p></p><i></i>
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Re: jetting
There's two things to consider:<br><br>Dynojet numbers don't match up to stock for the same flow.<br><br>stock jets won't work without the airbox. It's not clear whether the K&N filter mentioned refers to the pods for the stage III, or the one that replaces the stock element in the air box. I agree that 132 mains from dynojet, or stock, would be way too rich on a bike with an air box. But this is not the case if the air box is removed. <br><br>I believe some clarification is needed here. <p></p><i></i>
Re: jetting
the filter is the one that replaces the standard in the air box <p></p><i></i>
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Re: jetting
If that's the case, I agree with dg1951, you're running way too rich. Go back to stock and work from there. You might just need to play with the needle height to get it spot on. <p></p><i></i>
Re: jetting
so u r saying stock jetting even with k/n +race can <!--EZCODE EMOTICON START :\ --><img src=http://www.ezboard.com/images/emoticons/ohwell.gif ALT=":\"><!--EZCODE EMOTICON END--> <p></p><i></i>
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Re: jetting
well, you might need to go richer one increment, or 2. You'll have to go through some tuning to find out. You need a baseline to start with and you'll be better off starting closer to optimum. <p></p><i></i>
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Re: jetting
Here's some food for thought:<br><br>Lowering back pressure by switching to a race can does not change the fundamental engine/pipe relationship. True, you have less back pressure and this will increase volumetric efficiency and possibly slightly change the pipe tuning (a.l.a exup) but this added air demand should be accommodated by the carb. Its job is to keep the fuel/air ratio constant over varying amounts of air flow. <br><br>You most likely will need to play with the needle because this slight change in pipe tuning mentioned above occurs in the mid band right where you have a dip in the dyno torque curve. That's where the pipe and engine are not in sync. and the net effect is your motor runs rich. The needle position is a compromise between leaning this rich spot and not letting the motor get too lean at higher rpm. <p></p><i></i>
Re: jetting
I totally agree with the Flyingcircus! I have a 1040 kit with a K&N filter+race can, hve run the bike from sea level to 10,000 feet. Stock jetting is spot on. I have run every combination up thru 127 in all four carbs and have found stock jets with the second needle position my best set-up. The huge downside is that even with new emulsion tubes the damn thing hates the heat and starting from a stop. I don't think there will ever be a cure for that. <p></p><i></i>
Re: jetting
so i should just mess with the needles dclip up one from stock ?? <p></p><i></i>
Re: jetting
oops i meen down<!--EZCODE EMOTICON START :rolleyes --><img src=http://www.ezboard.com/images/emoticons/eyes.gif ALT=":rolleyes"><!--EZCODE EMOTICON END--> <p></p><i></i>
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Re: jetting
start with the stock setting, then try a richer setting to compare. etc. etc. etc. <p></p><i></i>
Re: jetting
just fitted the new carbs new needle jets float hight adjusted all passageways bolwn out with 100lbps and gues wot it runs crap seems to be missing on 1 cylinder i know its not ignition cos it ran ok ish with old carbs going to strip them agani tomorrow any idea what to look for <!--EZCODE EMOTICON START :( --><img src=http://www.ezboard.com/images/emoticons/frown.gif ALT=":("><!--EZCODE EMOTICON END--> <!--EZCODE EMOTICON START :( --><img src=http://www.ezboard.com/images/emoticons/frown.gif ALT=":("><!--EZCODE EMOTICON END--> <p></p><i></i>
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Re: jetting
You have to separate the circuits to analyze it. <br><br>How's it idle?<br><br>How's part throttle at low to mid rpm?<br><br>Try rolling the throttle on in first or second gear. How high does it rev up before breaking up? how much throttle at that point?<br><br>Do you have new plugs in it? if you ran it with 132 mains, they most likely are NG and need to be swapped out. <p></p><i></i>
Re: jetting
Jon, here's a great site from <!--EZCODE LINK START--><a href="http://www.factorypro.com/tech/carbtune ... gines.html" target="top">Factory Pro</a><!--EZCODE LINK END--> on how to get the carbs dialed in right....I like the resistor type spark plugs 'cause you don't have to worry about gapping 'em.... <p><!--EZCODE FONT START--><span style="color:lime;font-size:medium;">Nbot</span><!--EZCODE FONT END--><br><!--EZCODE ITALIC START--><em>'94 Fizzer Litre</em><!--EZCODE ITALIC END--></p><i></i>
Re: jetting
idle smooth but as if its missing on 1 cylinder,3000/4000 snap the throttle and its instant power (no hesitation or flat spots )4000 + 10 times better then the dynojeted carbs(if i take the plug cap off cylinder2 that is what idle sounds like <p></p><i>Edited by: <A HREF=http://p072.ezboard.com/bexupbrotherhoo ... exupjon</A> at: 8/5/04 12:25 pm<br></i>
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Re: jetting
have you swapped out the plugs? do that first to make sure that your problem isn't fouled, or bad, plugs. <p></p><i></i>
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Re: jetting
Now this is getting interesting- it sounds a lot like the problem my bike has.<br><br>On the subject of jetting, I recently fitted a BMC airfilter (have standard can). Had it checked on a dyno with gas analyser, and the jetting is near perfect. <p></p><i></i>
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Re: jetting
Bear with me when I ask the following obvious question:<br><br>have you checked the valve lash and done a compression test before playing with your carbs? You might have a tight, or leaky, valve that's giving you a head ache. <p></p><i></i>