Hard to start issue - Ducati Supersport 939 Forum
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post #1 of 92 (permalink) Old 06-12-2017, 11:36 AM Thread Starter
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Hard to start issue

This morning I had an issue where my 939SS was hard to start. Not sluggish like a bad battery, but more like the engine just wouldn't catch. It took me at least 10 tries of press-and-hold the starter for two-three seconds to finally get the engine to finally catch.

This is how my '94 SS behaves when it's cold outside and there's no choke on the carbs, which make me wonder - it was 70F when I parked last night, and 54F this morning when I tried starting it. I wonder if the ECU didn't pick up the temperature change when I turned it back on.

Has anyone else had a hard time getting their bike to start when the bike is cold and/or it's cold outside?

1994 900 SS/CR
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It's Italian. If I can get it to start, it'll win.
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post #2 of 92 (permalink) Old 06-12-2017, 12:16 PM
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Quote:
Originally Posted by psyopper View Post
This morning I had an issue where my 939SS was hard to start. Not sluggish like a bad battery, but more like the engine just wouldn't catch. It took me at least 10 tries of press-and-hold the starter for two-three seconds to finally get the engine to finally catch.

This is how my '94 SS behaves when it's cold outside and there's no choke on the carbs, which make me wonder - it was 70F when I parked last night, and 54F this morning when I tried starting it. I wonder if the ECU didn't pick up the temperature change when I turned it back on.

Has anyone else had a hard time getting their bike to start when the bike is cold and/or it's cold outside?
I saw a reading of 55F on my weather app this morning, but the bike start fine at first trigger
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post #3 of 92 (permalink) Old 06-12-2017, 12:47 PM
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Do you connect to a battery maintainer charger over night
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post #4 of 92 (permalink) Old 06-12-2017, 05:54 PM Thread Starter
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Originally Posted by amoslws View Post
Do you connect to a battery maintainer charger over night
No. On a brand new bike with less than 300 miles, I should not need to put it on a battery tender to park at my place of employment for 12 hours. Each of my rides so far has been over 15 miles, more than enough to recharge from starting the bike.
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1994 900 SS/CR
2017 939 SuperSport S

It's Italian. If I can get it to start, it'll win.
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post #5 of 92 (permalink) Old 06-12-2017, 07:08 PM
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If it's a one off I wouldn't worry about it
Monitor it over a few days
Still giving you a problem check the battery
Most modern battery chargers will indicate the level of charge in the battery(well mine does anyway)
Fingers crossed it's a one off
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post #6 of 92 (permalink) Old 06-12-2017, 08:36 PM
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There are a lot of cold start vids about Ducatis on YouTube. Try to find the one that is closest to yours and post the link

Last edited by 1uglybastard; 06-12-2017 at 08:44 PM.
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post #7 of 92 (permalink) Old 06-12-2017, 10:13 PM
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fuel pump
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post #8 of 92 (permalink) Old 06-13-2017, 01:34 AM
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The diagnostics at the first service should be able to give a more definitive fact, until then I suppose we are all guessing the problem. I too had an issue during the first 1000km where the DQS and DRL switched off on their own and the errors were in memory of the ecu. It has not happened since and the same could be with your issue. It's like the ecu throws a wobbly.
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post #9 of 92 (permalink) Old 01-24-2018, 05:13 AM
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Quote:
Originally Posted by psyopper View Post
This morning I had an issue where my 939SS was hard to start. Not sluggish like a bad battery, but more like the engine just wouldn't catch. It took me at least 10 tries of press-and-hold the starter for two-three seconds to finally get the engine to finally catch.

This is how my '94 SS behaves when it's cold outside and there's no choke on the carbs, which make me wonder - it was 70F when I parked last night, and 54F this morning when I tried starting it. I wonder if the ECU didn't pick up the temperature change when I turned it back on.

Has anyone else had a hard time getting their bike to start when the bike is cold and/or it's cold outside?
Did you find out what the issue was? I'm getting a similar issue the recently, but summer here in New Zealand
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post #10 of 92 (permalink) Old 01-24-2018, 06:38 AM
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Some people with other Superbikes have sometimes similar Problems.
Try this:
turn the key on and wait some seconds (So the System pumps gas to the injectors) turn it off and on again. Maybe do this 2 , 3 times, than start!
This can help!!!

Trackdays: may 13th Misano DRE, Sep. 23/24, Most, Czech Republic, Racetrack days of Ducati Superbike Forum.
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