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andy1303 |
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andy1303 L Plate Warrior
Joined: 01 Mar 2024 Karma :
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Posted: 18:06 - 01 Mar 2024 Post subject: Yam YBR250 running rich - FI Diagnostic Tool CO adjustment |
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Hi,
I'm new here so hope you can help with a problem I have.
A while ago I purchased very cheaply a rather rough YBR250. It was showing Fault Code 14, faulty intake air pressure sensor.
Now, this bike has a combination sensor which measures TPS, intake air temp and intake air pressure. Web searching brought up the suggestion to clean it, but after no luck with that, I replaced it with a Chinese copy. This resolved the fault code and the bike seemed to run fine.
I went for a couple of long runs, and it seemed fine, but after using it on some very short runs I found it was fouling the plug. Once run it just died and I had to get recovered, another time it started and then just died, refusing to start again until I replaced plug.
After more web searching and reading the factory service manual I came across the CO setting, which is accessed using the Yamaha FI diagnostic tool. This setting appears to adjust the richness at idle. There is a lot of information here https://www.thumpertalk.com/forums/topic/1145194-yamaha-fi-diagnostic-tool-wr450-specific/#comments where they seem to adjust it to get better starting.
I decided it was worth buying the Yamaha FI Diagnostic Tool. Today, I took the bike for a run to get the bike warm, and then tried adjusting the CO. By lowering the setting from 0 to -40, the tickover started to pick up, as if the mixture was getting leaner and closer to the ideal mixture. Lowering it to -60 raised the tickover even more, however I decided to leave it set to -40 where it would be at the richer end of the scale. I didn't have the bottle to keep going to see if I could lean it out to the point of tickover dropping again.
While I appreciate the numbers do not directly correlate with a specific AFR, -40 and -60 seem quite extreme. I was wondering if anyone has any experience with the FI Diagnostic Tool and adjusting this CO setting? Does my logic appear right?
It's a bit soggy outside at the moment so I haven't had a chance to go out and see how it cold starts.
Any thoughts or comments would be much appreciated.
Andy |
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WD Forte |
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WD Forte World Chat Champion
Joined: 17 Jun 2010 Karma :
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 20:54 - 01 Mar 2024 Post subject: |
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You have to wonder why it's running so rich on stock FI settings.
Is there a rats nest in the airbox? Might be worth a check because I don't believe there's a sensor to check that. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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andy1303 |
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andy1303 L Plate Warrior
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WD Forte |
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WD Forte World Chat Champion
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andy1303 |
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andy1303 L Plate Warrior
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
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Kawasaki Jimbo |
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Kawasaki Jimbo World Chat Champion
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WD Forte |
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WD Forte World Chat Champion
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andy1303 |
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andy1303 L Plate Warrior
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