September 17th, 2021, 07:19 AM | #1 |
ninjette.org guru
Name: Bob
Location: Chicago
Join Date: Sep 2012 Motorcycle(s): '06 Ninja 250, 2018 Honda GL1800B Posts: 315
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Help with carb (?) issues
My 2006 ninja, which has stock engine, exhaust and intake, recently began running poorly. It starts well, but is slow to operate off choke, will not idle, and the revs hang after acceleration. Midrange and full throttle performance are good. Fuel delivery is good. Valves are adjusted and plugs are recent.
I disassembled and cleaned the carbs (setting the idle screws at 2-1/2 turns out), and added fresh fuel, and it ran well for a few days, then settled into its old habits again. Any ideas? The carbs were not really dirty when I took them apart, but I soaked and blew out the jets and passages. I re-installed all the parts correctly. I didn't find any intake air leaks (but maybe I'm not looking in all the right places). Any suggestions based on experience would be appreciated. Thanks. |
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September 17th, 2021, 07:44 AM | #2 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
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Hi Bob... we were just talking about you and your yellow Ninja, and I mentioned that it was the inspiration for my red Ninja.
Since you said the valves are adjusted, my first guess is the carburetors and not completely clean. It's easy to miss a small, well-hidden passage, and the little idle passages are the first to show trouble. |
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September 17th, 2021, 09:09 AM | #3 | |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
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Quote:
- carbs needs to be disassembled down to every last nut, bolt and individual component - everything soaked in ultrasonic cleaner - secret hidden passages need to be mechanically scrubbed with brushes using strong solvents and PEA-based cleaners - jets and emulsion-tube bleed holes needs to be flossed with matching gauge wire - micro soda-blasted As compared to before, your cleaning did improve performance, but deeper cleaning more thorough restoration job is needed. |
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September 17th, 2021, 05:53 PM | #4 | |
ninjette.org guru
Name: Bob
Location: Chicago
Join Date: Sep 2012 Motorcycle(s): '06 Ninja 250, 2018 Honda GL1800B Posts: 315
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Well, that’s what I did, except for the “micro soda blasting,” which seems like overkill and wouldn’t affect the passages anyhow.
My problem is that I can’t figure out what part of the carbs is incorrect, dirty or damaged. Just disassembling and cleaning them over and over again doesn’t seem like effective troubleshooting. Quote:
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September 17th, 2021, 06:26 PM | #5 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
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Maybe Ducatiman will have some advice.
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September 17th, 2021, 07:51 PM | #6 | |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Quote:
Here’s link to passages that needs to be scrubbed from end-to-end: http://n4mwd.blogspot.com/2013/10/se...-passages.html 1. Scrub out all hidden secret fuel-circuits beyond jets with brushes. Amazon - nylon brushes. I like to use 75/25% acetone mix with PEA-based fuel-system cleaner such as Chevron Techron, Red Line SI-1, etc. 2. Soak in ultrasonic cleaner for hours using polar solvent (PineSol, Totally Awesome, vinegar, etc.) Be aware that Simple Green dissolves aluminium, so avoid it. Amazon - 4L Ultrasonic cleaner 3. Scrub again with brushes. Pay particular attention to holes where fuel-circuits exit into carb-venturi (neon green dots in photos). Poke those out with soft copper wire. Remove deposits but be careful not to remove any metal as size of these holes are critical to fuel-metering 4. Be sure to completely disassemble emulsion tube and poke out all lateral bleed holes with copper wire. Same with all jets and bleed holes in carb venturi. Soaking and scrubbing won’t clean these holes and you’ll find wire pushes out dried plastic petrol plugs similar to grains of sand. 5. micro soda-blast all circuits and bleed holes to clean out debris loosened and left by scrubbing. Use finest soda available AircraftSpruce - mini soda blaster 6. replace all rubber parts: float-valves, O-rings, seals and even slide diaphragms as needed. 7. adjust float-levels 8. sync carbs with manometers. While old-style analogue gauges work, I prefer modern digital versions. carb-sync gauges Once you’ve done this, carbs will be factory-fresh clean and bike will run like brand-new. |
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September 17th, 2021, 08:02 PM | #7 |
Guy Who Enjoys Riding
Name: Jim
Location: North Carolina
Join Date: Jul 2016 Motorcycle(s): Ninja 250 Posts: A lot.
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Or send them to Ducatiman and get on with your life.
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1 out of 1 members found this post helpful. |
September 18th, 2021, 08:36 AM | #8 |
ninjette.org certified postwhore
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot.
MOTY - 2018, MOTM - Nov '17
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Exactly! Many expert mechanics have had to remove their carbs 4-5x to do ever deeper cleaning until bike ran right. It looks me over 40-hrs one time to do proper carb restoration until bike ran like new. Now I just send them to ducatiman 1st time around.
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September 18th, 2021, 12:49 PM | #9 |
Retired motorcycle Mc.
Name: Robert
Location: Weed, California.
Join Date: Jul 2021 Motorcycle(s): 2012 Kawasaki Ninja 250R, 2021 CSC TT250, 1977 Triumph Bonneville 750cc,2001 Honda XR650L. Posts: A lot.
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exactly the case ! I'm a retired motorcycle mechanic and I did a quick cleaning of the carbs on my Ninja and I've found it wasn't clean enough... these carbs are tricky, they don't like to come clean with carb cleaner sprey and they demand a complete dismantle to get to all the passageways...
.... so the carbs defeeted me at first go around, and I've been into bikes all my life.... their not as easy to get clean as they were 20 years ago !!!!! it will take you all day to do it right ! plan on it ! make sure every passage way is clear if you miss one, that is the one that will make the bike not work right, side passage ways inside of holes are the worst offenders from what I understand, pay extra close attention to them ( where the emulsifier tube goes) .... take your time and do it right ! Bob......
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Its too late when you've gone too far ! Last futzed with by Bob KellyIII; September 18th, 2021 at 12:52 PM. Reason: Additional information |
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September 18th, 2021, 12:54 PM | #10 |
ninjette.org guru
Name: Bob
Location: Chicago
Join Date: Sep 2012 Motorcycle(s): '06 Ninja 250, 2018 Honda GL1800B Posts: 315
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Thanks for the info. Very helpful diagrams. I'll probably go with Ducatiman. Life is short.
Edit: Ducatiman came through. The whole process took just a few days, including shipping. He found several clogged passages (don't ask me how), cleaned and perfectly assembled the carb set, and now the bike is running like it should. Last futzed with by Chicagobob; September 25th, 2021 at 04:46 PM. |
2 out of 2 members found this post helpful. |
October 14th, 2021, 11:05 PM | #11 |
ninjette.org member
Name: Honorio
Location: Rio Grande Valley
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we need to all gather together and get ducatiman a gift
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RIDE IT UNTIL THE WHEELS FALL OFF, THEN BUY NEW WHEELS |
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October 15th, 2021, 02:35 AM | #12 |
Retired motorcycle Mc.
Name: Robert
Location: Weed, California.
Join Date: Jul 2021 Motorcycle(s): 2012 Kawasaki Ninja 250R, 2021 CSC TT250, 1977 Triumph Bonneville 750cc,2001 Honda XR650L. Posts: A lot.
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I couldn't agree more ! He's the man !
with the amount he charges for his supprime carb work he isn't getting rich ! I think we need a Raffle or something , or donate into a fund and send him a nice fat check...... I'll donate ! Bob.........
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Its too late when you've gone too far ! |
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October 15th, 2021, 05:44 AM | #13 |
ninjette.org member
Name: Dustin
Location: NC
Join Date: Oct 2021 Motorcycle(s): 250r Posts: 80
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Take it from me just fixed carbs on a 01 similar problems remove pilot jets and make sure there clean and the hole in the end is poked threw also use a wire and poke out hidden passage ways by the flap of carb behind the air idle adjustment needle
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