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Old July 20th, 2021, 11:00 AM   #1
Sandr
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Symptoms of a bad Fuel screw Adjustment

I was wondering if anyone could explain the symptoms of a bad Fuel Screw Adjustment, How would the bike run at different RPM's if they are too tight, or too loose.
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Old July 20th, 2021, 12:16 PM   #2
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The mixture screw adjusts idle mixture (closed throttle) only. Starting and idling are affected by the adjustment of these two screws of the two carburetors. They should be adjusted for fastest idle speed, plus maybe a tiny bit richer (more counterclockwise).
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Old July 20th, 2021, 01:17 PM   #3
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I'm personally curious about why the question ❓ us the OP having issues?
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Old July 20th, 2021, 01:28 PM   #4
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I'm personally curious about why the question ❓ us the OP having issues?
Trying to understand my bike more i suppose. After a war with my carburator i finally got my bike running again. The bike is a little jumpy at low speeds, but on Highway speed it runs perfectly. i suspect a minor tuning is in order.

hard to describe but say around 20-30 mph, or say 15-20% throttle the bike doesnt hold a consistant speed. almost like its pulsing . Before swaping out a hose on the bike wich finally led to the fix, i was playing around with my mix screws, and didnt know if a bad mix could lead to these problems. Also to note the bike runs better on choke then without making me suspect im too lean or rich
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Old July 20th, 2021, 02:25 PM   #5
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That's into the needle-needlejet circuit. Mine was exactly like that when I got it, with surging at steady running speeds. I shimmed the needles something like 1/2 a millimeter and it cured it. When Ducatiman restored my carbs to new condition he asked if I wanted to keep the shims and I said no. When I got them back and installed them, EVERYTHING about the carbs and fueling was perfect and no shims were needed. I assume there was some varnish or other obstruction in the needle jet circuit that he removed.
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Old July 21st, 2021, 07:24 AM   #6
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Start with your Idle Mixture Screws about 2.5 turns out. That should get you close if everything else is right.

Set it precisely after a ride, when the engine is at operating temp.

The adjustment can change, depending on air temp and fuel type (% of ethanol).

As TJ said - highest RPMs + about 1/8 richer (out) is my method. Reset the idle speed to about 1300 when you are done.

Also sync the carbs if you haven't, then redo the mixture setting.

Lots of info in this section -https://faq.ninja250.org/wiki/Intake
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Old July 21st, 2021, 09:02 AM   #7
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thanks for the heads up guys! ill give it a go ill play with them some more! I'll look to send em his way towards the end of the season so i can take advantage of the gas mileage while i still can. My truck is killing me with like 12 MPG lolol
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Old July 21st, 2021, 09:06 AM   #8
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I'll look to send em his way towards the end of the season so i can take advantage of the gas mileage while i still can.
He turns them around very quickly. I don't think it was a week between when I took mine out and when I was putting them back in.
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Old July 21st, 2021, 09:35 AM   #9
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thanks for the heads up guys! ill give it a go ill play with them some more! I'll look to send em his way towards the end of the season so i can take advantage of the gas mileage while i still can. My truck is killing me with like 12 MPG lolol
Sending them to ducatiman will end any concern about carb issues for you.
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Old July 21st, 2021, 10:14 AM   #10
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Thanks guys! i just reached out will be doing this
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