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K100 won't start after winter sleep Thu Mar 25, 2021 6:34 pm
Tarlin
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active member
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Hi,
after the bike spent the winter hibernation in the garage, it won't start. The problem started last year, same, after winter, but eventually as the weather warmed up it fired up, and ran without any issues for the whole season.
This year it is happening again. About a month ago, I was able to start the bike, connected to the car battery, but only after prolonged starting.
-The bike now has a new battery with a 400A start current, so the battery is definitely not the issue here, the starter motor also turns the engine without any hesitation.
-I put in a set of new spark plugs, just in case. Even tried the Criss Harris youtube procedure with adding 10ml of oil in each cylinder to improve compression, but to no avail.
-all 4 spark plugs tested for spark, looks ok. Spark plugs look moist with gasoline, smell of gasoline, so I guess the injectors are ok? Also the fuel pump seems ok, you can hear it.
-when I try to start the bike with the choke on, it just cranks, but shows no lust for life:)
-when I try to start the bike without choke, after a few seconds it kind of wants to power on, but doesn't. Last time (one month ago) I started it, it also started without choke, run very erratic, until I put the choke on, then it idled beautifully, and ran very nice afterwards.
Any ideas or suggestions would be appreciated!
after the bike spent the winter hibernation in the garage, it won't start. The problem started last year, same, after winter, but eventually as the weather warmed up it fired up, and ran without any issues for the whole season.
This year it is happening again. About a month ago, I was able to start the bike, connected to the car battery, but only after prolonged starting.
-The bike now has a new battery with a 400A start current, so the battery is definitely not the issue here, the starter motor also turns the engine without any hesitation.
-I put in a set of new spark plugs, just in case. Even tried the Criss Harris youtube procedure with adding 10ml of oil in each cylinder to improve compression, but to no avail.
-all 4 spark plugs tested for spark, looks ok. Spark plugs look moist with gasoline, smell of gasoline, so I guess the injectors are ok? Also the fuel pump seems ok, you can hear it.
-when I try to start the bike with the choke on, it just cranks, but shows no lust for life:)
-when I try to start the bike without choke, after a few seconds it kind of wants to power on, but doesn't. Last time (one month ago) I started it, it also started without choke, run very erratic, until I put the choke on, then it idled beautifully, and ran very nice afterwards.
Any ideas or suggestions would be appreciated!
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1987 BMW K100, VIN:0093523