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Old September 12th, 2018, 12:54 AM   #11
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Originally Posted by mentalist View Post
Ok, I have the rapid bike and had a similar problem with a steady throttle. Turned out to be a bad connection on the lambda sensor which later failed.
I replaced the lambda sensor and bike has been fine since.
Mentalist,
By lambda sensor, do you mean the entire 02 sensor unit? If so, which one? I have the exact same issue as OP. Also have RB Evo. I think he isolated his 02's during one test and no change.
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Old September 12th, 2018, 01:44 AM   #12
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Hi, my front O2 sensor failed and had to be replaced, prior to that when the throttle was playing up I found that the block connector and terminals for the front sensor where water contaminated and corroded. Note that the rapid bike loom plugs into these sensors. There are resistance checks you can carry out from the connector to see if the sensor has failed.
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Old September 12th, 2018, 06:59 AM   #13
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I'm thinking this is a better lead. I've found lots of corroded terminals upon dismantling.
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Old September 12th, 2018, 08:18 AM   #14
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I'm thinking this is a better lead. I've found lots of corroded terminals upon dismantling.
let me know how you get on, hope you get it sorted.
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Old September 12th, 2018, 04:27 PM   #15
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I disconnected both lambda sensors and turned autotune off and the bike has been running great the past 2 days. The connectors are clean. I think its the sensors themselves. I do have a service light on the dash but I can live with that till I get around to replacing the sensors.
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Old September 12th, 2018, 06:58 PM   #16
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Ok, I have the rapid bike and had a similar problem with a steady throttle. Turned out to be a bad connection on the lambda sensor which later failed.
I replaced the lambda sensor and bike has been fine since.
This makes sense. Idle and just off idle FI is closed loop and at that point the system is looking to the sensor for info and not getting it. So the TCU is functioning, bt the cpu isn't getting the info it's looking for based on the TCU position, so it's probably programmed to "guess' which leads to excessive surging.
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Old September 12th, 2018, 07:28 PM   #17
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What's needed to remove the sensor leads? I have rapidbike Evo. Would like to disconnect the sensors but what else do I need to do?
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Old September 12th, 2018, 11:25 PM   #18
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What's needed to remove the sensor leads? I have rapidbike Evo. Would like to disconnect the sensors but what else do I need to do?
Why do you want to disconnect your leads?? do you have a running issue too?
Your rapid bike evo needs the info from these sensors to adapt.

If they are faulty you need to replace the sensors not just remove them.
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Old September 12th, 2018, 11:29 PM   #19
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Quote:
Originally Posted by Araitim View Post
I disconnected both lambda sensors and turned autotune off and the bike has been running great the past 2 days. The connectors are clean. I think its the sensors themselves. I do have a service light on the dash but I can live with that till I get around to replacing the sensors.
Carry out a resistance test on both sensors, only one might need replacing.
They aren't cheap unless you find a good second hand one, like I did.
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Old September 12th, 2018, 11:29 PM   #20
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Quote:
Originally Posted by Araitim View Post
I disconnected both lambda sensors and turned autotune off and the bike has been running great the past 2 days. The connectors are clean. I think its the sensors themselves. I do have a service light on the dash but I can live with that till I get around to replacing the sensors.
Carry out a resistance test on both sensors, only one might need replacing.
They aren't cheap unless you find a good second hand one, like I did.
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