1 1991 K100RS, another no-start Sun Dec 03, 2017 3:40 pm
Rabidchiwawa007
Platinum member
Alright, boys, here we go. 1991 k100rs 16v.
I rode about 15min to work, all was normal, smooth, and good. Rode 15min home from work, and about half way through I noticed the bike missed a little when I gave it some throttle. So like anybody curious would do, I gave it throttle again, and whaddya know, it missed/stumbled again. It got worse as the ride went on. It idled ok at the stoplight after I got off the highway, but as soon as I'd rev it at all it would stumble and try to die. I had to ease in to it *really* easy to make it home. Constantly almost dying in low rpm at that point, missing/stumbling alot. Got home, turned bike off, bike won't start. That was a couple days ago.
I've checked: fuel / air / spark / compression. Air was good, spark was normal, all 4 injectors were equal in spray and seemed normal. -Possibly- it was too much fuel?, but I don't think so in comparison to youtube videos of people's injectors spraying. Compression is as follows, cylinder 1-4 in psi: 120, 110, 125, 120.
What else could it be? As I'm typing this, I'm leaning toward the Hall sensor, but that's usually heat related and goes away when the bike cools off. Could it be a coolant temp sensor malfunctioning? Could the computer have bit the dust?
It cranks over normally, nice and strong, it just doesn't catch and start.. It never sounds like it "almost" starts either, just cranks over.
Thanks in advance.
I rode about 15min to work, all was normal, smooth, and good. Rode 15min home from work, and about half way through I noticed the bike missed a little when I gave it some throttle. So like anybody curious would do, I gave it throttle again, and whaddya know, it missed/stumbled again. It got worse as the ride went on. It idled ok at the stoplight after I got off the highway, but as soon as I'd rev it at all it would stumble and try to die. I had to ease in to it *really* easy to make it home. Constantly almost dying in low rpm at that point, missing/stumbling alot. Got home, turned bike off, bike won't start. That was a couple days ago.
I've checked: fuel / air / spark / compression. Air was good, spark was normal, all 4 injectors were equal in spray and seemed normal. -Possibly- it was too much fuel?, but I don't think so in comparison to youtube videos of people's injectors spraying. Compression is as follows, cylinder 1-4 in psi: 120, 110, 125, 120.
What else could it be? As I'm typing this, I'm leaning toward the Hall sensor, but that's usually heat related and goes away when the bike cools off. Could it be a coolant temp sensor malfunctioning? Could the computer have bit the dust?
It cranks over normally, nice and strong, it just doesn't catch and start.. It never sounds like it "almost" starts either, just cranks over.
Thanks in advance.
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1968 BSA Lightning
1991 BMW K100RS 16v with K1100LT fairing