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Old July 24th, 2013, 08:28 AM   #16
jkv45
Rev Limiter
 
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Name: Jay
Location: WI
Join Date: Jul 2013

Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes

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MOTM - Jun '18, Oct '16
Quote:
Originally Posted by Crriiissss View Post
My friend also noticed that sometimes when the bike is on idle, there's a hiccup where the rpm jumps and than drops down. You can see it in the following video.

http://www.youtube.com/watch?v=2zAQSomMNqU

Any thoughts anyone?
Did you remove the idle mixture screw caps? Chances are the mixture could be adjusted.

Were the jets and jet holder removed and cleaned carefully? They need to have a small copper wire inserted and the jet spun around it to remove deposits on the inside of the opening. I've seen jets that you can see light through, but even after repeated spraying with carb cleaner were not completely open. Using the copper wire and carb cleaner will open them up. The jet holder can also be crushed down if tightened too much.

You shouldn't need full choke for any length of time to keep it running. There is a blockage of some kind in the carb.
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