stumbles/rich down low?

[Thor]

Thanks Chuck,<br><br>The site is great. I will check the needle jets for wear and do the deed.<br><br>Cheers<!--EZCODE EMOTICON START :D --><img src=http://www.ezboard.com/images/emoticons/happy.gif ALT=":D"><!--EZCODE EMOTICON END--> <p></p><i></i>

[phildekked]

Just a thought......?<br><br>Do the emulsion tubes ( needle jets ?) wear out ovalised because the carbs are downdraught ?<br> I can only guess that gravity is pulling the needle down onto the sides of the tube all the time and that the up down motion of the throttle causes it to wear the sides of the tube....?<br><br><br>?<!--EZCODE EMOTICON START :\ --><img src=http://www.ezboard.com/images/emoticons/ohwell.gif ALT=":\"><!--EZCODE EMOTICON END--> <br><br>.p. <p></p><i></i>

[FZRDude]

Good point, I never thought of it that way. <p>Tim<br><!--EZCODE IMAGE START--><img src="http://img.photobucket.com/albums/v209/ ... <!--EZCODE IMAGE END--><br><!--EZCODE ITALIC START--><em><!--EZCODE FONT START--><span style="color:red;font-family:times new roman;font-size:small;">Insert Joke Here</span><!--EZCODE FONT END--></em><!--EZCODE ITALIC END--><br><!--EZCODE ITALIC START--><em><!--EZCODE FONT START--><span style="color:white;font-family:times new roman;font-size:small;">Dir. of Entertainment<!--EZCODE LINK START--><a href="http://eddieandthecruisersmc.com" target="top"> Eddie & the Cruisers</a><!--EZCODE LINK END--></span><!--EZCODE FONT END--></em><!--EZCODE ITALIC END--><br><!--EZCODE ITALIC START--><em><!--EZCODE FONT START--><span style="color:blue;font-family:times new roman;font-size:small;">'94 FZR 1000</span><!--EZCODE FONT END--></em><!--EZCODE ITALIC END--></p><i></i>

[dragracer1951]

Nope...they wear because of vacuume pulses at the carb throat at low rpms. if you ride in town the most, your carbs will wear faster than if you ride the opwn road<br>Aftermarket needles are harder than stock also<br>Jim <p></p><i></i>

[Nbot]

I believe factory pro backs up Jim's story........ <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>

[flyingcircus68]

It seems to me that the answer to the riddle would be the sum of Phil and Jim's thoughts. <!--EZCODE EMOTICON START :p --><img src=http://www.ezboard.com/images/emoticons/tongue.gif ALT=":p"><!--EZCODE EMOTICON END--> <p></p><i></i>

[dragracer1951]

I could see how you'ld think that way...But I have a bunch of 80's Suzukis that I've had to do emulsion tubes on....and they fur sure arn't downdraft carbs<br><br>I'm not sayin that downdraft has nothing to do with it....just not as much as ya might think<br>Jim <p></p><i></i>

[flyingcircus68]

OH!<!--EZCODE EMOTICON START :eek --><img src=http://www.ezboard.com/images/emoticons/eek.gif ALT=":eek"><!--EZCODE EMOTICON END--> <br><br>Now that you mention it, it makes sense. the air velocity does impart a load and would force the needle toward the intake manifold. <p></p><i></i>

[phildekked]

Yeah suppose both must be true ...seeing as the needles being forced towards the intake and pulled down by gravity ( on downdraft carbs) ...<br><br>So do downdraft carbs wear their tubes quicker than upright ?<br><br>.p. <p></p><i></i>