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Post by amishland on Mar 22, 2007 19:48:56 GMT -5
can some one post how to do this?
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Post by Dandy Dan on Mar 23, 2007 10:46:04 GMT -5
Okay there are 2 adjustments...the normal idle screw on the right side of the carb and then the 'idle mix screw' at the bottom on the left side. The normal idle screw just controls how much throttle your engine is getting when you aren't holding the throttle open. This screw pushes the throttle open a little even when you're not touching the throttle.
The other screw controls the amount of gas being vapourized into the air at idle. What you want to do is mess with this idle mix screw until your air/fuel mix is good. As your air fuel mix improves your idle RPM will rise (because a good mix = more power) so just play with the idle mix screw until your RPM is as high as you can get it. Then use the other screw to adjust the amount of throttle so that the RPM's drop back to 2000 RPM. If you get it dialed it should be within 100 RPM of 2000RPM at idle (more so when your engine is warmed up) and it should be a steady idle because the mix is good so it's not cutting out or anything.
If your idle mix is way off then you might need to crank up the idle screw to add more throttle just to keep in running. As a result, as you get it close you may need to turn down the throttle screw a few times or you'll keep hitting the 3500RPM clutch engagement point as you get it closer and closer. This should really only happen after you've gone the BB piston or something though. If you don't have a tach then this adjustment is much harder to do so you'd better have a good ear.
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Post by amishland on Mar 25, 2007 11:53:37 GMT -5
Thanks DD, do you recomend any tach in particular? i do not want to use my ear, also is it important to monitor vaccuum?
Also I was wondering is there any adjustment that can be made to the throttle it seems like my throttle not go all the way like running out of travel before it should (but i do hit 34 mi/hr on flats i am using kitaco CDI and variator)
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Post by Dandy Dan on Mar 26, 2007 10:58:49 GMT -5
I love my Veypor VR2 because it does everything (tach, speedo, odometer, fuel gauge, timed runs, g-forces, braking runs, etc) but it's also $300 so there are other much cheaper options. Chanito has a nice tach but it's still kinda expensive ($80??). There's a 'tach' thread in the 'aftermarket parts' or 'performance ideas' section right now that might be on to a good, cheap tach so keep an eye on that if you're on a budget.
I don't think monitoring the vacuum is important but Chanito may correct me on this.
For the throttle...there are 2 nuts that postion it on the right side of the carb and you can move these nuts to tighten or loosen the thottle cable. What I do is back off the idle screw all the way and then but the throttle as close to the carb as I can without creating slack. Then I reset the idle screw. This will position your throttle cable nicely and should fix your issue...have a look at the right side of the carb right now while you rotate the throttle to see what it's doing now before you mess with it.
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Post by chanito on Mar 26, 2007 19:30:30 GMT -5
Thanks DD, do you recomend any tach in particular? i do not want to use my ear, also is it important to monitor vaccuum? Also I was wondering is there any adjustment that can be made to the throttle it seems like my throttle not go all the way like running out of travel before it should (but i do hit 34 mi/hr on flats i am using kitaco CDI and variator) If you have an early (pre '06) scooter, then you have access to manifold vacuum, this make adjustment to the idle mixture as simple as playing with the idle mixture screw until you get the highest vacuum as easy as 1-2-3 . If you have a late model ('06 and up) you will have to play with the idle mixture screw until to reach the highest engine speed, the bad part is that it will require to adjust "in" until to get to a certain drop (like 200 rpms) and then adjust "out" pass the highest point until you get to the same drop and set the mixture in the middle so is not as easy There is a stop cast on the carburetor, you can grind it down a little if you are not getting full throttle, but i have yet to find one Keihin carburetor where you would need to do that
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Post by PC on Feb 4, 2019 23:54:14 GMT -5
can some one post how to do this?
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Post by Tonyyyyyy on Dec 7, 2020 19:26:28 GMT -5
can some one post how to do this? Has anyone figured out how to do this?
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