May 5th, 2024, 10:02 AM | #1 |
ninjette.org newbie
Name: Bennett
Location: Central Florida
Join Date: Jan 2022 Motorcycle(s): 250 Ninja Posts: 3
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Please help me understand "thread"
Hi all. I have a 2010 250R that has been sitting for years. I got it running a while ago but then it sat again but now looking to complete the project.
It was starting with ease but when I would give it gas it would bog down and stall. Pulled the carbs and they were very dirty. What had me confused is when I pulled out the needle in the diaphragm a small plastic washer came out and I am not sure of its purpose. The bike has the stock #98 and #38 main and pilot jets. The air mixture screw plugs had been removed by the previous owner and the air box is stock. What I have are this washer pictured next to a needle holder and spring: Wondering if the previous owner was trying to work around or improve an issue. Anyone have an idea? |
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May 5th, 2024, 11:33 AM | #2 |
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.
MOTM - Nov '18, Mar '17
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possibly using the washer as a needle shim? Either activly shimming or passively, conveniently storing the washer above the needle, thus enabling quick access if needed?
But just 1 washer, not present on the other slide needle?
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Custom Carb Service Last futzed with by ducatiman; May 5th, 2024 at 01:01 PM. |
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May 5th, 2024, 01:12 PM | #3 |
ninjette.org newbie
Name: Bennett
Location: Central Florida
Join Date: Jan 2022 Motorcycle(s): 250 Ninja Posts: 3
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Thanks, there was one with each needle. I was thinking a shim as well as when jetting the needles are adjustable, so maybe the previous owner saw this as a way to improve on the response by allowing gas to flow at a quicker time?
I put the carbs back in the bike using the washers as a shim, will see if there are issues and if so will pull them back out and remove the washer. I would have thought if shimming that there would have been jet changes, hole in the lift made bigger (not sure if it has been drilled out), or a change the air intake like a K&N style filter or individual filters. Also the pipe is stock. Thanks |
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May 5th, 2024, 04:10 PM | #4 |
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.
MOTM - Nov '18, Mar '17
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FYI.....the N9VU needle should be in the LH carb, N9VW in the RH carb....you've verified both are numerically correct and placed in correct locations?
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Custom Carb Service |
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May 6th, 2024, 03:20 AM | #5 |
ninjette.org newbie
Name: Bennett
Location: Central Florida
Join Date: Jan 2022 Motorcycle(s): 250 Ninja Posts: 3
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Yes, found that bizarre but saw that in the service manual.
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May 7th, 2024, 08:37 AM | #6 |
ninjette.org member
Name: Bob
Location: Murphys CA
Join Date: Dec 2023 Motorcycle(s): EX250F (2x) Posts: 10
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May 7th, 2024, 08:44 AM | #7 |
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.
MOTM - Nov '18, Mar '17
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yes, side of needle, just under the "head". Very light, may be difficult to read.
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Custom Carb Service |
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