Post by endru on Sept 16, 2013 20:36:21 GMT -5
Check out the difference between jet on the left which came stock in my carb and the jet on the right which I ordered a while back. I just now noticed: The head of the newer jet is slightly longer than the head of the stock jet - 0.7mm longer to be exact. Overall length is the same, as is thread diameter, number of threads and distance between each thread is the same.
Would using the jet with the longer head cause issues? From what I understand, the needle comes in at the threaded end of the jet. If the head is longer, then the threaded end wouldn't screw in as far, which means the needle wouldn't go into the jet as far... so my guess is yes it would cause problems.
In the past I bad bad startups and idle, making me guess the needle wasn't closing off the main jet the whole way at idle. Additionally, I had a 50mm bbk and free flow exhaust and air filter, yet I couldn't get the scooter to run half decently on anything larger than an #
main, which is definitely abnormal.
The other thing worth mentioning is that my idle jet is not the same shape as a typical idle jet. It's still a Keihin idle jet, but slightly different. See my previous thread itistheride.boards.net/index.cgi?board=50ac&action=display&thread=2703
So... am I on to something here?
Would using the jet with the longer head cause issues? From what I understand, the needle comes in at the threaded end of the jet. If the head is longer, then the threaded end wouldn't screw in as far, which means the needle wouldn't go into the jet as far... so my guess is yes it would cause problems.
In the past I bad bad startups and idle, making me guess the needle wasn't closing off the main jet the whole way at idle. Additionally, I had a 50mm bbk and free flow exhaust and air filter, yet I couldn't get the scooter to run half decently on anything larger than an #
main, which is definitely abnormal. The other thing worth mentioning is that my idle jet is not the same shape as a typical idle jet. It's still a Keihin idle jet, but slightly different. See my previous thread itistheride.boards.net/index.cgi?board=50ac&action=display&thread=2703
So... am I on to something here?
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