My CBR250's engine turns off when Downshifting!!! - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 1280 Old 11-19-2011, 04:43 AM Thread Starter
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My CBR250's engine turns off when Downshifting!!!

I bought my CBR250 this summer, and from the start I've been having the same problem(about 25 times as of now). When I'm coming to a light(or just slowing down), I pull the clutch in, then begin brake and downshift, then the engine just turns off. The electrical panel and lights are on but the engine just stalls out. I was frustrated so I searched the web and low and behold many people on this forum have the same type of problem I'm having. So after the more than a dozen times this happened to me I brought it back the to dealership at about 400 miles for the first "600" mile tune up and to check on the problem. The dealership adjust the valves per the tune up and test road the bike, but were unable to replicate the problem. I then got the bike back to once again experience the same unforced stalling of the engine. So I brought it back and the dealership was unable to replicate the problem once again, so I went there and I was able to replicate the issue at the dealership. A very nice honda regional representative came down the following week to look at the bike, I then went to the dealership and attempted to replicate the problem again but was unable to on that lovely rainy cold day! The Honda representative returned the next week and brought a special diagnostic tool and hooked it up to the bike, to some port on the back of the bike. This tool showed like everything going on with the bike at the time and he spent a day on the bike but could not replicate the problem. Once again I went to the dealership and tried to replicate the problem with the special attached tool but was unable too. Everything diagnostically checked out fine, so I took the bike back still frustrated, not even the next day it happened to me 2 times while riding. In fact one of the time I was in 4th gear at about 45 miles per hour, pulled the clutch in, waited a second then shift down 1 gear, and sure enough the engine once again just turned off. So 2 days later I ordered some video equipment and had it shipped to me. First try was unsuccessful, but the next day I GOT IT ON TAPE Here it is enjoy:


I was told on the phone by Honda that the people's post on this site related to this problem, could not be reliable because "Honda doesn't like to speculate on internet rumors". So if you are someone who has experience this same problem I have and can relate to my video above, please post and let me know.
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post #2 of 1280 Old 11-19-2011, 06:09 AM
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I HAVE THE EXACT SAME PROBLEM.

My bike has only done 140km and has stalled 3-4 times down shifting.
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post #3 of 1280 Old 11-19-2011, 08:32 AM
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Once

Mine has only done it once in 5,000 miles. At 1000 miles? Fully warm engine after 5 minutes of travel on a clear 50F morning. I was cruising in 6th at 45 mph, so no where near any stalling rpm of the engine. Approaching a right hand turn with a yield sign to enter the on ramp to the highway. Pulled in the clutch to coast around the corner and drop down two gears. When I started to let out the clutch, I noticed the engine had stalled. I recognized what had happened immediately thanks to this forum , pulled the clutch in right away, keyed the starter, and rode on. Not very handy if you are trying to kick down two as you are whipping into the passing lane. One guy almost got killed. I think it is related to the decel fuel shut off feature that all modern fuel injected engines have. Fuel injection is shut off any time the rpms are above a certain value and the throttle is closed, and starts again when the rpms drop below a set value such as 2000 rpm. The start up of injection sometimes isn't catching it in time. Or, the "rest" setting of the idle air valve is too low. Honda would need to flash the fuel computer with a safer map rpm value for the beginning of injection to fix it or maybe change the idle air valve or both. This is a big ask for any automotive company as any changes to fuel control will require recertifying the emissions. This fuel system is already installed on millions of Honda scooters but they are all CVT transmission and have 1/2 the displacement so would probably never act up.
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https://www.cbr250.net/forum/cbr250-p...-stalling.html
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https://www.cbr250.net/forum/cbr250-p...ng-clutch.html
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Last edited by sendler; 11-19-2011 at 08:34 AM.
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post #4 of 1280 Old 11-19-2011, 09:35 AM Thread Starter
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So I'm noticing a trend, that I hope honda will pick up on!! And I'm glad I don't feel crazy, I almost did dealing with this whole situation. I'm thinking it's something related to what you are talking about or it's the angle of the road like a 15% incline I've noticed it more on. Maybe there are certain angles the counterbalance doesn't work at? All I know after dealing with Honda and reading MULTI peoples post about this happening, is that I believe there is something wrong with this bike. I've actually had the bike shut off on me in really dangerous situations, but how long before this bike made for "beginners" actually gets someone hurt or killed? I mean if I was a new rider and the bike shut off on me, I might not be able to figure out what to do. Actually I would prolly become panick/freeze up, seeing as this is not something I would have ever experienced or seen before, but that's not gonna stop the 18 wheeler behind me, from turning me into a pancake!!!
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post #5 of 1280 Old 11-19-2011, 10:15 AM
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Sorry this is my first post. I am really enjoying my first motorcycle. However, I too am experiencing this problem.

My bike has 850 miles on it and I have had this happen about 20 times, usually at least once each ride. Although there have been some rides when it hasn't happened at all it usually does it at least once. It doesn't seem to matter if it's warmed up or not because it has happened at the beginning of a ride as well as after at least a half hour of riding. It does seem to be related to a rapid closing of the throttle.
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post #6 of 1280 Old 11-19-2011, 10:18 AM
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Also, I don't think it has anything to do with incline or decline as the roads I ride on are mostly flat.
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post #7 of 1280 Old 11-19-2011, 10:24 AM Thread Starter
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Wow you sound like you're have the exact same problem as me. Just like many other people on this forum. I would say give it back to the dealership and tell them it's BS what's happening with it. If they can't replicate it then send them the link to my YouTube video and tell them this is what you're experiencing. This way you don't have to go through all the time I did trying to replicate it for them. I was told the post here about this problem are "Internet rumors" per Honda (thanks Michelle at honda). So show them the video and tell them "This isn't a rumor, seeing is believing"!!
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post #8 of 1280 Old 11-19-2011, 11:01 AM
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Not sure I can see any situation to pull a clutch fully in, and snap off the thottle fully, on a motorcycle while its moving unless its to stop in first gear.

Be smooth rolling off the throttle,
only pull the clutch in 1/3-1/2 way between gear changes.

Mine stalled when it had 20km on it riding it home as I pulled into the drive.. my fault for not being smooth with an unfamiliar brand new single cylinder engine.




Sent from my mobile phone while driving, waiting for a vigilante Motovlogger to star in his own train wreck.
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post #9 of 1280 Old 11-19-2011, 11:19 AM Thread Starter
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Quote:
Originally Posted by Aufitt View Post
Not sure I can see any situation to pull a clutch fully in, and snap off the thottle fully, on a motorcycle while its moving unless its to stop in first gear.

Be smooth rolling off the throttle,
only pull the clutch in 1/3-1/2 way between gear changes.

Mine stalled when it had 20km on it riding it home as I pulled into the drive.. my fault for not being smooth with an unfamiliar brand new single cylinder engine.
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.
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post #10 of 1280 Old 11-19-2011, 11:33 AM
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Bad batch of fuel?/ filter? too low octane?




Sent from my mobile phone while driving, waiting for a vigilante Motovlogger to star in his own train wreck.
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