April 1st, 2011, 10:29 AM | #1 |
ninjette.org newbie
Name: Brian
Location: Virginia
Join Date: Oct 2010 Motorcycle(s): None yet Posts: 5
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Stock mixture screw settings
I need to double check if the stock settings for the idle mixture screws is really 2.5 turns out for the left and 1.75 turns for the right carburetor. Just so no one is confused to which screws I'm talk about it's these...
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April 1st, 2011, 11:43 AM | #2 |
Join Date: Nov 2008 Posts: Too much.
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September 12th, 2023, 03:46 PM | #3 |
ninjette.org newbie
Name: clinton
Location: oklaoma
Join Date: Jan 2023 Motorcycle(s): 08 ninja 250r Posts: 9
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Which one is air. Which one is fuel
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September 12th, 2023, 03:51 PM | #4 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
MOTM - Oct '18, Aug '17, Aug '16
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Each carburetor has one idle mixture screw. They are fuel adjustments, so screwing one in will make that cylinder leaner.
Exactly where you initially set them isn't critical, since it's important to do the final adjustment by warming up the engine fully and adjusting each screw for the highest idle speed. It's usually best to err on the side of a little rich. Here's some more informaiton: https://faq.ninja250.org/wiki/How_do...dle_mixture%3F |
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September 12th, 2023, 04:30 PM | #5 |
ninjette.org newbie
Name: clinton
Location: oklaoma
Join Date: Jan 2023 Motorcycle(s): 08 ninja 250r Posts: 9
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I have found that they only can be adjusted for up to 5,000 rpms. What do you adjust for problems higher then that. I'm having big issues at 8500 rpms and everyone said adjusting those screws wouldn't do anything. The bike factory specs are set 2.5 left and 1.75 right. If they are both fuel why are they set different???
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September 12th, 2023, 04:42 PM | #6 | |
ninjette.org certified postwhore
Name: Gordon
Location: new york
Join Date: Sep 2009 Motorcycle(s): '95 DUCATI 900SS/SP '07 DUCATI SS800 '19 HONDA CBR650R Posts: A lot.
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Quote:
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Custom Carb Service |
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September 12th, 2023, 11:00 PM | #7 |
ninjette.org certified postwhore
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MOTY - 2018, MOTM - Nov '17
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Uneven pilot-screw settings because bike doesn't have perfectly even firing order. Exhaust scavenging effects for each is different. Also left & right needles are different. If you've taken them out, make sure they go back in correct side. Make sure your float-levels are set correctly with final external wet-test as confirmation.
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