1 Bike wont start cold Sun Aug 19, 2012 2:04 am
Wombat
active member
Hey guys,
Sorry that one of my first posts on here is another "Bike wont start" post, I'm sure you're all sick of going through the checklist.
I've read through all the other similar posts and nobody seems to have had the same problem as my bike (a 1987 K100RS).
The problem is that there doesn't seem to be anything wrong!
The symptoms:
When I push the starter button the starter engages, the fuel pump whirrs, the engine turns over and individual cylinders seem to fire occasionally but the bike wont keep running.
This only happens when it is stone cold. When warm she is perfect, one quick stab of the starter button and she is away.
Once running, she purrs like a kitten. No spluttering, backfiring, dead spots in the rev range, nothing.
This has gotten worse over the last few weeks to the point that I can no longer get her started at all.
What I've done so far:
I've been going through the trouble shooting checklist that Crazy Frog wrote (thanks mate, learned heaps about the bike).
I started by stripping her down and going through every electrical connection, cleaning and making sure the contacts are good.
Then I replaced the spark plugs and checked that each of them has a nice fat blue spark.
Then I replaced the fuel filter in case it had sucked in some rubbish.
Then I checked the resistance on the water temperature sensor (3.2KOhms at 15 degrees C - seems about right)
Then I pulled the injectors and each of them is squirting a jet of fuel at the same time, but I'm not sure if it is too much or not enough, I just know they are working!
I managed to get her started yesterday by spraying starter fluid into the air intake and as usual, once she was warm she ran perfectly and started first stab of the button, but today even the starter fluid wont work - she fires up, but wont keep running once the fluid runs out.
I've got air, fuel and a spark.... why wont she run?????? and why only when she's stone cold???
Unfortunately I don't have a fuel pressure tester and I'm a long way from professional help, should I just assume its a fuel pressure problem and replace the pump and regulator on spec?
I'm completely stumped so any advice would be gratefully received!!!!! (sorry for the novel too)
Wombat (Paul).
Sorry that one of my first posts on here is another "Bike wont start" post, I'm sure you're all sick of going through the checklist.
I've read through all the other similar posts and nobody seems to have had the same problem as my bike (a 1987 K100RS).
The problem is that there doesn't seem to be anything wrong!
The symptoms:
When I push the starter button the starter engages, the fuel pump whirrs, the engine turns over and individual cylinders seem to fire occasionally but the bike wont keep running.
This only happens when it is stone cold. When warm she is perfect, one quick stab of the starter button and she is away.
Once running, she purrs like a kitten. No spluttering, backfiring, dead spots in the rev range, nothing.
This has gotten worse over the last few weeks to the point that I can no longer get her started at all.
What I've done so far:
I've been going through the trouble shooting checklist that Crazy Frog wrote (thanks mate, learned heaps about the bike).
I started by stripping her down and going through every electrical connection, cleaning and making sure the contacts are good.
Then I replaced the spark plugs and checked that each of them has a nice fat blue spark.
Then I replaced the fuel filter in case it had sucked in some rubbish.
Then I checked the resistance on the water temperature sensor (3.2KOhms at 15 degrees C - seems about right)
Then I pulled the injectors and each of them is squirting a jet of fuel at the same time, but I'm not sure if it is too much or not enough, I just know they are working!
I managed to get her started yesterday by spraying starter fluid into the air intake and as usual, once she was warm she ran perfectly and started first stab of the button, but today even the starter fluid wont work - she fires up, but wont keep running once the fluid runs out.
I've got air, fuel and a spark.... why wont she run?????? and why only when she's stone cold???
Unfortunately I don't have a fuel pressure tester and I'm a long way from professional help, should I just assume its a fuel pressure problem and replace the pump and regulator on spec?
I'm completely stumped so any advice would be gratefully received!!!!! (sorry for the novel too)
Wombat (Paul).