September 13th, 2020, 02:47 PM | #1 |
ninjette.org member
Name: Tim
Location: NJ
Join Date: Sep 2013 Motorcycle(s): 2006 Ninja 250 Posts: 47
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one cylinder richer than the other
I have a carburetor issue going on (don't most of us do?). The backstory is the bike was sitting in my garage for a while and with the pandemic, it has given me time to revive it. So long story short, I cleaned the carbs out multiple times due to one issue or the other, rebuilt it with new float bowl gasket, new idle mixture screws, o-rings, spring, and washer, and new float needles. I finally had it running great like a month ago.
Did a small road trip to pick up mail at my gf's place, about 60 miles away, then went to my mom's to pick up old mail, about 30 miles away, then on the way home, I lost all power while on the highway and could not rev past 6k RPM and had a real tough time going above 50 mph. I was able to limp it home and I cleaned the carb again. Honestly, no real findings but I did notice my air filter was disintegrated, so I replaced that with a stock style UNI. I took it for a test ride and it was hard to idle when warmed up. I played with the idle screws a bit and right now I currently have it idling decent while warm but it has a hell of a time starting when cold. This wasn't an issue when it was running great. So my current issue is I have cylinder 1 running much richer at idle than cylinder 2. There was a misfire for sure and with the bike running at idle warmed up (fans kicking on), I have to set the idle screws at 1 turn out on 2 and like half a turn out on 1 for the misfire to go away. I've pulled the plugs to verify this. #2 is a good brown color but #1 is black. I've done a compression test and it is 155 on both cylinders. Checked spark and it fires right. Checked valve timing and it is at the limits of loose where I last set it. I have a dynojet kit and I theorized that when I put the new filter in, it threw off the jetting so I stepped down the needle height one notch so its on the 3rd notch. I've also set the float height to 19mm, which is also the limit of what the service manual says. I thought maybe the coasting enricher is at fault but I took it apart and the o-ring and diaphragm looks good. Plus I think the design of the enricher throws fuel in both carbs if there is enough vacuum. What else can cause one side of the carb to dump more fuel than the other? Thanks in advance. |
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September 13th, 2020, 03:52 PM | #2 |
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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September 13th, 2020, 05:24 PM | #3 |
ninjette.org member
Name: Sergey
Location: Ontario, GTA
Join Date: Oct 2019 Motorcycle(s): Ninja ZZR250 (EX250H) Posts: 213
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Have you synchronized the carbs ?
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September 13th, 2020, 07:05 PM | #4 | |
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:
You’ll have better luck with pee, it has ammonia which does good job of cleaning deposits off aluminium. To really clean carbs requires lots of mechanical scrubbing and flossing of secret hidden fuel-circuits after jets. Also needs hours if soaking in ultrasonic cleaner followed by micro soda-blasting. Do search on here for “clean carbs ducatiman” for photos and procedures on what it takes to restore carbs to factory-fresh clean condition. When carbs are restored to factory-fresh clean, bike will run like brand-new off showroom floor. |
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September 13th, 2020, 07:40 PM | #5 | |
ninjette.org member
Name: Tim
Location: NJ
Join Date: Sep 2013 Motorcycle(s): 2006 Ninja 250 Posts: 47
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Quote:
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September 14th, 2020, 01:43 AM | #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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Unless you’ve disassembled carbs down to each and every individual component and scrubbed, poked and flossed them, along with replacing all rubber O-rings and seals, your carbs are not factory-fresh clean. Your bike will run like brand-new model off showroom floor when carbs are factory-fresh clean.
Check out this thread for photos and procedures on how to get carbs factory-fresh clean. Do search here for “clean carbs ducatiman” to find threads with similar symptoms to yours and how to get bike back to brand-new showroom condition. |
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