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C400 idle issue

Berkayberk

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Joined
Jan 12, 2025
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Turkey
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Hi everyone, I bought a bmw C400 i used 9000 km.
The problem started recently and happens at idle. The engine revs by itself when the bike is idle and the idle speed fluctuates unpredictably.I close the gas when i close the red lights it give a gas yourself and try to keep going.it have a idle problem i re set idle but it cant be solve the problem.
 
Hi everyone, I bought a bmw C400 i used 9000 km.
The problem started recently and happens at idle. The engine revs by itself when the bike is idle and the idle speed fluctuates unpredictably.I close the gas when i close the red lights it give a gas yourself and try to keep going.it have a idle problem i re set idle but it cant be solve the problem.
1) Welcome to the forum.

2) What year and model is your C 400? As I vaguely recall, BMW made some changes to the early model years of the C 400 X that involved the idle system components and software, so I was wondering whether any of that affects your bike.
 
Hi everyone, I bought a bmw C400 i used 9000 km.
The problem started recently and happens at idle. The engine revs by itself when the bike is idle and the idle speed fluctuates unpredictably.I close the gas when i close the red lights it give a gas yourself and try to keep going.it have a idle problem i re set idle but it cant be solve the problem.
There were some issues with 2023 idle that was resolved with a software upgrade from the dealer. The dealer will need to look it up. It did not affect all bikes.
 
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