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Discussion Starter #1
This happened couple of times to me - i was going to stop on the stop sign. Holding a clutch I was downshifting to 1 gear and breaking at the same time. When I stopped I realized that engine has quietly stalled and i had to start it again.
What could it be? I noticed this was happening only during first 5-10 minutes of riding. Maybe because it was cold?
 

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Just make sure your clutch is adjusted correctly (no slack, but not overly tight) and put some miles on it. I had the same issue with another Honda a few years back. Just needed to be ridden, as the engine was "tight" until it was completely broken-in.
 

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Discussion Starter #3 (Edited)
Thanks, i have just ~50 miles yet on my CBR - got it just last week from the dealer. That might be the reason.
 

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Its a common thing, mine has done it about 10 times since new, its when you blip the throttle at low revs it'll stall, its the way the pgm-fi unit learning the "ropes", My CB400 09 model did the same when new for about 600-800 kms but is fine now.
 

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dont think ive had that problem at all.ive only stall'd 2 times the first day i got the bike.900 miles now and havent stall'd
 

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Discussion Starter #6 (Edited)
Took it to the dealer today. They were not able to reproduce it quickly and offered to leave the bike with them for the day. I told that will do at 600 mile service.
During today's quick check they did not find anything wrong with bike tuneup, but acknowledged that there might be an issue and reported it to Honda. Now we are waiting for response, maybe there are similar problems already reported.

For now i just release throttle more slow when pulling a clutch, that helps.
 

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This happened couple of times to me - i was going to stop on the stop sign. Holding a clutch I was downshifting to 1 gear and breaking at the same time. When I stopped I realized that engine has quietly stalled and i had to start it again.
What could it be? I noticed this was happening only during first 5-10 minutes of riding. Maybe because it was cold?
Well there's your problem, try stopping near the sign next time ;)

Intermittent problems like this are always going to be hard to diagnose, it will be interesting to hear what honda have to say about it though (considering that it's a brand new engine for them too).
 

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question??? could you be letting the clutch out too quickley...which leads to a possible stall? Sorry, you could be doing everything right, just had to ask:D
 

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Discussion Starter #9 (Edited)
question??? could you be letting the clutch out too quickley...which leads to a possible stall? Sorry, you could be doing everything right, just had to ask:D
No, i am not releasing it at all, doing a full stop. I am pulling a clutch, holding it, and at the same time quickly (maybe too quickly) release throttle, apply front break, and shift two clicks down from third to first gear. I think it dies when i am doing a second "click" and passing thru neutral.
BTW -shifting down from second to first feels very different from any other shifts, its "longer" and i feel when it passes a neutral position.
 

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Mine has never stalled when it wasn't my fault, I always use Shell V Power though. I also warm it up at least 2 minutes (1 bar) before leaving
 

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Discussion Starter #11
No stalls today!:)
Here is what I did different:
- warm the bike for ~5 mins on neutral before riding
- do not skip 2nd gear when stopping, but downshift to it and use engine to brake
 

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Its fuel injected why do you have to warm it up? I dont and use the cheapest gas, never stalls. Practice your shifting and throttle habits.
 

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Its fuel injected why do you have to warm it up? I dont and use the cheapest gas, never stalls. Practice your shifting and throttle habits.
Because it's a single cylinder, even 1 misfire can mean a stall at idle. Even in newer cars when you first start it up in the morning a couple misfires aren't unusual.
 

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Because it's a single cylinder, even 1 misfire can mean a stall at idle. Even in newer cars when you first start it up in the morning a couple misfires aren't unusual.
Guess I got lucky, mine doesnt misfire, doesnt stall, and shifts properly.
 

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Guess I got lucky, mine doesnt misfire, doesnt stall, and shifts properly.
They usually wont misfire but a very cold engine coming down in rev's from a shift isn't unlikely at all. Like I said, mine's never stalled either but the start up idle is fairly rough IMO, which is very very normal for all engines.

And you asked why it was important to warm it up and I kinda didn't answer that. Well it's all about thermal expansion. The rings aren't sealing properly and the bearings aren't in proper tolerance until the motor is warmed up. They do things to help compensate for it however. Like oval shaped pistons in a circle cylinder so the piston can expand to a perfect circle for a better seal. A piston doesn't expand out in a perfect circle due to design, the part where the wrist pin goes through is going to expand at a different rate.
 
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Mine idles low for about the first 5-10 seconds then i take off. As I ride it and let the engine warm up I try to be easy on it for the first mile or two.
I guess my point was that him stalling his bike probaly had nothing to do with the engine being hot or cold, was probaly his clutch/shifting and throttle control.
 

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Most modern bikes (including yours) have a "wet clutch". The transmission, and the clutch run in the same oil that is in the engine. On some small displacement bikes that don't make much power at idle, the cold oil that the clutch is running in causes enough drag on the clutch plates to cause a stall at idle even with a properly adjusted clutch pulled all the way in. The only ways around it that I know of are don't let the revs fall all the way to idle as you stop (pain in the rear) or let her warm up for a couple of minutes before you leave.

Have Fun,
Java
 

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Took it to the dealer today. They were not able to reproduce it quickly and offered to leave the bike with them for the day. I told that will do at 600 mile service.
During today's quick check they did not find anything wrong with bike tuneup, but acknowledged that there might be an issue and reported it to Honda. Now we are waiting for response, maybe there are similar problems already reported.

For now i just release throttle more slow when pulling a clutch, that helps.
Did Honda come back with anything? I just bought mine yesterday and have gotten this problem too when slowing down to a stop with clutch 100% in. Probably happened 5 times?? Once the engine was warm (half way) then I no longer had this issue.

warming up the engine - doesn't this defeat the purpose of fuel injection? I'm very new to all of this. This is my first bike! :confused:
 

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Discussion Starter #19
Did Honda come back with anything? I just bought mine yesterday and have gotten this problem too when slowing down to a stop with clutch 100% in. Probably happened 5 times?? Once the engine was warm (half way) then I no longer had this issue.

warming up the engine - doesn't this defeat the purpose of fuel injection? I'm very new to all of this. This is my first bike! :confused:
No, don't have any response from Honda on this. Good thing is (as i wrote in some other thread here) that these stalls were happening for me only during first ~200 miles. Now I am at > 2K and it does not happen at all.
What I do:
- warm the bike for ~1 minute before riding.
- use more engine braking when stopping. Now I almost never stop with clutch fully in, but instead downshift and ride on every gear until full stop and have clutch fully in only on complete stop.
 

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No, don't have any response from Honda on this. Good thing is (as i wrote in some other thread here) that these stalls were happening for me only during first ~200 miles. Now I am at > 2K and it does not happen at all.
What I do:
- warm the bike for ~1 minute before riding.
- use more engine braking when stopping. Now I almost never stop with clutch fully in, but instead downshift and ride on every gear until full stop and have clutch fully in only on complete stop.
I'm no expert here, but when i did my pre learner course (before you are allowed a learner permit) there was a section regarding stopping. And the curriculum and instructor emphasized that when slowing to a stop (e.g. At a red traffic light), the clutch should be held in, u should be in first gear, then when at complete stop, go to friction point in case you need to move asap if there is danger behind you.

But it sounds as though this "problem" doesnt allow this way of slowing to a stop? Glad to know my 250 isnt the odd one out, but still sounds like an issue, especially when during the learner course this wasnt covered, the dealer mentioned nothing like this in his "rundown" before taking it away. Wouldn't mind knowing what Honda actually have to say. :(
 
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