My CBR250's engine turns off when Downshifting!!!

[Aufitt]

In 4 decades of motorcycling I'd never heard of anyone riding along coasting with the clutch pulled in before joining cbr250.net.

[putoff]

Originally Posted by Aufitt

In 4 decades of motorcycling I'd never heard of anyone riding along coasting with the clutch pulled in before joining cbr250.net.

Watch the video at the start of the thread. A man is riding along, and goes to shift down in the regular way, as he comes up to some traffic lights. The bike stalls the moment the clutch is pulled in. It's not about coasting, it's about the engine dying the moment the clutch is pulled in. Honda PAID him for his motorcycle back; they, your gods, decided that there was a significant enough problem that they wanted a sample bike. The veracity of the problem has been LONG established.

[Texas250]

Originally Posted by sendler

It's not the spark plug wire.

I didn't think that was the issue, because the issue is sort-of random, an arc would be all the time, I was just reporting what was said.

Also I called American Honda, and the customer service rep said she had heard of the problem, but had no other information, and said if there was an issue to return it to an authorized dealer, and they would take care of it. It's just a matter of time before they have the issue resolved and a fix available. Even if you are out of warranty, Nissan did it for my parent's truck when they realized there was a problem with something they did.

[Joeboo]

Has anyone checked air flow meter for a falt or dirty, happens with injected cars put the clutch in & it stalls out ? Just a thought

[sendler]

Originally Posted by Joeboo

Has anyone checked air flow meter for a falt or dirty, happens with injected cars put the clutch in & it stalls out ? Just a thought

The CBR250R doesn't have an air mass sensor.

[Joeboo]

It must have some way of measuring the air going in for the rite air/fuel ratio ?

[250 Tom]

Originally Posted by CBR250newOWNER

As you can see I'm coming to a light that is turning red, and as I learned in my drivers education class; when coming to a light that you must stop at, pull the clutch in and break to the light as you shift down to 1st gear so you can begin riding again when able. I normally don't ride like this but I was trying to show the problem I've been having. Bottom line though, after I pull the clutch in and the engine is technically idling/disengaged now, and provide I'm not reving the engine, WHY would the bike shut off? The motor is out of the equation with the clutch pulled in, so no matter what I do, shift up, down, brake, coast along, there is no excuse for why the engine should just shut off. This is my 3rd motorcycle I've owned and 5th bike I've ridden and I've never had a problem like this before.

Any responce from Honda as to whats causing this problem? Or is it like the engine rattle there just ignoring it.

[sendler]

Originally Posted by Joeboo

It must have some way of measuring the air going in for the rite air/fuel ratio ?

It has an O2 sensor, crank position sensor, throttle position sensor, intake air temp sensor and manifold absolute pressure sensor.

[Aufitt]

Can someone with a bike that stalls take the header off and post a pic like what I posted?

It comes off in 2 mins.

[sendler]

That's all they need to fix the stalling! Tune up in a can.
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