October 5th, 2016, 01:38 PM | #1 |
ninjette.org member
Name: Ruben
Location: Arizona
Join Date: Sep 2016 Motorcycle(s): 2007 Ninja 250 and 1991 Yamaha Virago XV750 Posts: 228
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How do you guys check whether one carb is running stronger or more rich/lean? Plugs?
Besides watching the plugs and "syncing" the carbs, is there any other suggestions to determine if one carb is adjusted better or worse than the other?
My background with 1 cylinder "thumpers" makes it easy, but with two cylinders and two carbs, it's not that easy. |
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October 5th, 2016, 02:10 PM | #2 |
Vintage Screwball
Name: B
Location: Washington
Join Date: Feb 2016 Motorcycle(s): 2011 Ninja 250, 2008 Ninja 250, 2019 KTM 1290SDR, 2017 FZ10 Posts: A lot.
MOTM - Mar '16
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It is almost impossible to get a good plug read with modern unleaded fuels.
Let me know what you think of each one of the plugs below.
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Goin' fast on slow bikes! |
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October 5th, 2016, 02:14 PM | #3 |
ninjette.org member
Name: Ruben
Location: Arizona
Join Date: Sep 2016 Motorcycle(s): 2007 Ninja 250 and 1991 Yamaha Virago XV750 Posts: 228
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October 5th, 2016, 02:23 PM | #4 | |
Vintage Screwball
Name: B
Location: Washington
Join Date: Feb 2016 Motorcycle(s): 2011 Ninja 250, 2008 Ninja 250, 2019 KTM 1290SDR, 2017 FZ10 Posts: A lot.
MOTM - Mar '16
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Quote:
Bottom is perfect on 92 No Ethanol. Top is 100LL/92 No-E 50/50 mix perfect tune. Tested both on a dyno. I always thought the bottom one looked a little lean. Porcelain is perfectly white but the timing is good if you look at the strap. Idle is a tad on the rich side, which the dyno sheet reflects. Base circle is a bit dark. You're pretty good at reading plugs. Carry on.
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October 5th, 2016, 02:32 PM | #5 | |
ninjette.org member
Name: Ruben
Location: Arizona
Join Date: Sep 2016 Motorcycle(s): 2007 Ninja 250 and 1991 Yamaha Virago XV750 Posts: 228
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Quote:
I would only be concerned if one was more "sooty" black(rich) or a light tan(lean) or white. For me, a change in gas brands or the way you ride can make anything else most likely just guesswork. Thus the reason for my question. |
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October 5th, 2016, 02:38 PM | #6 |
Vintage Screwball
Name: B
Location: Washington
Join Date: Feb 2016 Motorcycle(s): 2011 Ninja 250, 2008 Ninja 250, 2019 KTM 1290SDR, 2017 FZ10 Posts: A lot.
MOTM - Mar '16
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The only other real way is to get an EGT monitor for each pipe, an IR thermometer to check pipe temps or a wideband O2 sensor and computer for each pipe.
Reading spark plugs is easier. A dyno tuner is more expensive but can read the gas output also.
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Goin' fast on slow bikes! |
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October 5th, 2016, 02:42 PM | #7 | |
ninjette.org member
Name: Ruben
Location: Arizona
Join Date: Sep 2016 Motorcycle(s): 2007 Ninja 250 and 1991 Yamaha Virago XV750 Posts: 228
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Quote:
I just always wonder if one cylinder is carrying more of the load than the other. Much like 2 locomotives pulling a freight train. I wonder how they balance the load between them. *smile* |
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October 5th, 2016, 03:43 PM | #8 | |
Rev Limiter
Name: Jay
Location: WI
Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot.
MOTM - Jun '18, Oct '16
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Quote:
EGT or O2 sensor would be the more accurate way, but obviously more complicated to DIY. |
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1 out of 1 members found this post helpful. |
October 5th, 2016, 11:38 PM | #9 |
in your machine
Name: Scott
Location: Summer Shade, Ky.
Join Date: Oct 2014 Motorcycle(s): 98 Ninja 250/F12 aka ZX-2R "SERENITY", 91 Ninja 500/A5 aka ZX-5R "Phoenix", 84 Honda GL1200A "SIREN" Posts: A lot.
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MOTM - Jun '17, May '16, Mar '15
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So many outside factors can/do effect the engine, valves out of adjustment, poor carburetors, fuels, etc......
The only true way is to get your hands on a exhaust gas analyzer, otherwise your just shooting in the dark, and taking the best guess you can.
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violente et ignorantia ZX-2R BLOG Twitter and Instagram = Ghostt_Scott I'm not here to change your mind, just to inform. |
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