Bike dies after 7 miles, checked everything, need help....?????
#21
Just a idea but you could hook a multimeter to the stator and strap the meter to your speedo. Set the meter to ac and with the leads before the reg/rec you should find the ac voltage. Ride the bike and when is shuts down leave the clutch out and let the chain spin the engine over. Does it make ac voltage? If the cdi is bad you will still have ac being generated.
A small scope to watch the wave form would be best but a meter will work.
This failure is very common in outboard engines
A small scope to watch the wave form would be best but a meter will work.
This failure is very common in outboard engines
Ride on
Brewster
#22
As a auto tech I diagnosis a ton of vehicles with a vantage pro graphing scope . Many are the same story. Died while driving. Of course starts right up off the truck. A scope is my go to tool. Fuel pumps, crank/cam sensors ect. It's the only way. Other wise your just playing (guess again auto) firing parts at it. Customers hate that.
Last edited by s10gto; 05-17-2016 at 09:34 PM.
#23
I did think about getting an inline spark tester. Hooking it up with my video cam recording it. This would show me if it's electrical for sure. I would need to record it cuz it happens and able to restart before I'm able to get off the bike to look at, or do anything. Cutting out for only a few seconds isn't enough time to do anything. I'm also not sure if it will run with this tester on. You would think that's what it's made for thoug. Yeah, $8 bucks at Auto Zone.
Before retiring, I was an electronic tech. Thermal or intermittent problems were some of the hardest to solve.
Ride on
Brewster
#24
Is this the same schematic as for your bike? Different model and year, but the only schematic I found that has electric start. But, I'm not familiar enough with the various KLX250 models.
http://www.classiccycles.org/media/D...92ffffe417.JPG
Ride on
Brewster
http://www.classiccycles.org/media/D...92ffffe417.JPG
Ride on
Brewster
#25
If the stator dies the bike wouldn't immediately stop. The bike will run on battery power alone until the battery voltage gets too low to support an effective spark. As the battery gets near this voltage the bike will stutter and jerk as the spark gets less effective.
This sounds like a fuel/venting issue.......haha only joking
It really sounds like an electrical issue, something that causes an open in the electrical circuit once a certain temperature is reached, due to the sudden stop of the motor. Off the top of my head would be ignition coil or the CDI. My advice is to buy a few cans of freeze spray. Run the bike until it fails and spray either the CDI or ignition coil. If it immediately starts then you have found your problem. If it doesn't try the other component.
This sounds like a fuel/venting issue.......haha only joking
It really sounds like an electrical issue, something that causes an open in the electrical circuit once a certain temperature is reached, due to the sudden stop of the motor. Off the top of my head would be ignition coil or the CDI. My advice is to buy a few cans of freeze spray. Run the bike until it fails and spray either the CDI or ignition coil. If it immediately starts then you have found your problem. If it doesn't try the other component.
#26
Well by Brewsters schematic it is a two wire crank sensor. That tells me it's not a hall switch. This is simpler and can be metered. This is where I would start it you see your spark tester drop out.
Thanks Brewster
Thanks Brewster
#27
Is this the same schematic as for your bike? Different model and year, but the only schematic I found that has electric start. But, I'm not familiar enough with the various KLX250 models.
http://www.classiccycles.org/media/D...92ffffe417.JPG
Ride on
Brewster
http://www.classiccycles.org/media/D...92ffffe417.JPG
Ride on
Brewster
Not sure if the one you posted is the same or not.
#29
Hey there...I feel your pain....I haven't posted here in a while....but you're thread reminded me of what happened to my 09. It would stall when warm after letting off the throttle abruptly. I did a mod to the cdi ground wire....search old posts or maybe someone else can remember the procedure. If I recall I think you cut the ground wire that runs back to the battery (very small gauge) and then ground the cdi directly to the closest bolt. It worked for me a few years back. Good luck!!
#30
If the stator dies the bike wouldn't immediately stop. The bike will run on battery power alone until the battery voltage gets too low to support an effective spark. As the battery gets near this voltage the bike will stutter and jerk as the spark gets less effective.
This sounds like a fuel/venting issue.......haha only joking
It really sounds like an electrical issue, something that causes an open in the electrical circuit once a certain temperature is reached, due to the sudden stop of the motor. Off the top of my head would be ignition coil or the CDI. My advice is to buy a few cans of freeze spray. Run the bike until it fails and spray either the CDI or ignition coil. If it immediately starts then you have found your problem. If it doesn't try the other component.
This sounds like a fuel/venting issue.......haha only joking
It really sounds like an electrical issue, something that causes an open in the electrical circuit once a certain temperature is reached, due to the sudden stop of the motor. Off the top of my head would be ignition coil or the CDI. My advice is to buy a few cans of freeze spray. Run the bike until it fails and spray either the CDI or ignition coil. If it immediately starts then you have found your problem. If it doesn't try the other component.