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Scooters - 50cc => Super 8 => Topic started by: eamartin on December 20, 2017, 04:04:04 PM
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Parts diagrams show an idle mixture screw with a slotted head for a flat blade screwdriver on this Keihin PB carb. My carb has what I've always presumed to be a brass plug in this location. The presumed plug does not have a round head as others I have seen. It is sort of D-shaped, with the flat side of the D positioned at about 11:00 in the attached photo. Does anyone know for sure what this is? Thanks
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sorry for the necro...
d-shaped carb screw (bit) is ... Air Screw (AKA Idle Speed Adjuster).
example of tool for it..
Motion Pro Replacement D-Shape Bit for Hex Driver - 08-0242 Dirt Bike Motocross |
Dennis Kirk https://buff.ly/2rsAmYp
Noticed that some tech without the bit... make an adjustment using a flat-blade screwdriver to adjust it. Seen others even make a homemade tool for it.
Lastly,
Flat blade screw to it's right is called Throttle Stop Screw.
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Hey, netlag! I had forgotten about this post (12/20/17). Thanks for setting me straight on this unusual-to-me screw head (not a plug as I had presumed). eamartin
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Was just reminded of the epa caps recently as I went to adjust the carb on my scoot. Learned of the d-shaped screw after the brass cap was removed from above it.
Was interesting to see all the work around people have used, was just sharing what I learned.
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netlag, I finally got back to working on my scooter. I bought the D-socket you recommended and removed the adjusting screw. This enabled me to confirm that the slow jet passage was once again blocked. Thanks for the tip on the D-socket.