1 crank but no start. injectors at fault? Wed Aug 16, 2023 1:07 am
taube
active member
EDIT: Preface, this bike was abandoned outdoors for 5 years before I tried starting it
I have replaced in-tank fuel lines, the fuel pump, and fuel filter. Along with a new battery, I tried to start my '88 K100RS. Here's a video of the attempt. How's it sound??
No start. Could be no spark? Or bad injectors? I tested the injectors first.
I think some people advise pulling the fuel rail to inspect the spray (e.g. onto some cardboard). It was too difficult remove because the injectors were firmly gummed into the engine block, so I disconnected and pulled them out individually.
Injector four (Bottom of the photo = rear of the bike) had a uniquely dry tip. The white residue was a bit puzzling. I peeked into cylinder four and maybe I saw surface corrosion on the intake valve My gut tells me the O-ring stopped sealing a while ago
After some cleaning (hopefully I didn't damage the injectors) I tested them with a 9V battery. Two of them fail to spray or make sound when I close the circuit. (dumb mistake-- I did not keep track of which injector was which after cleaning)
Here's what a good (?) one looked like as I push carb cleaner down a syringe
I think my options are
1) buy good injectors to start the bike with
2) inspect or replace sparkplugs in the meantime
3) take apart the engine taube, before you spend more money
(I tried to look at the spark plugs tips, but I have to buy the socket. Also, the HT leads require absurd force to pull out. I could only get out #1 and #2. There's dirt outside but the contacts are clean.
I have replaced in-tank fuel lines, the fuel pump, and fuel filter. Along with a new battery, I tried to start my '88 K100RS. Here's a video of the attempt. How's it sound??
No start. Could be no spark? Or bad injectors? I tested the injectors first.
I think some people advise pulling the fuel rail to inspect the spray (e.g. onto some cardboard). It was too difficult remove because the injectors were firmly gummed into the engine block, so I disconnected and pulled them out individually.
Injector four (Bottom of the photo = rear of the bike) had a uniquely dry tip. The white residue was a bit puzzling. I peeked into cylinder four and maybe I saw surface corrosion on the intake valve My gut tells me the O-ring stopped sealing a while ago
After some cleaning (hopefully I didn't damage the injectors) I tested them with a 9V battery. Two of them fail to spray or make sound when I close the circuit. (dumb mistake-- I did not keep track of which injector was which after cleaning)
Here's what a good (?) one looked like as I push carb cleaner down a syringe
I think my options are
1) buy good injectors to start the bike with
2) inspect or replace sparkplugs in the meantime
3) take apart the engine taube, before you spend more money
(I tried to look at the spark plugs tips, but I have to buy the socket. Also, the HT leads require absurd force to pull out. I could only get out #1 and #2. There's dirt outside but the contacts are clean.
Last edited by taube on Wed Aug 16, 2023 6:03 pm; edited 1 time in total
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Restoration project: 1988 BMW K100RS
Currently riding: 2019 Honda CBR300R