Reluctant starts

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Braaapster

Braaapster

Well-Known Member
Joined
May 30, 2024
Messages
94
Location
Canada
The starter motor seems mildly anemic but the bike has been starting quite reliably after a few cycles.

The bike is normally parked underground, except at work. With warmer weather now, I’ve had two instances where it seemed like the bike was not going to start when leaving work at the end of the day.

I’ve also been surprised to find the tank being mildly pressurized when refueling at the gas pump. Starting to wonder whether the hot & cold weather starts are being aggravated by tank pressure/vacuum being caused the apparent lack of direct vent line on the tank.

I wonder if the vent line is the plugged hose, hanging under the rear side of the engine case, and whether the plug is some Euro 5 BS that is intended to force venting through a restrictive evap canister.

Thoughts?
 
My surprise is based on my ‘16 KTM 690 Enduro: it had an evap can (which I removed with a sensor bypass) but it also had a direct tank vent hose, near the filler hole.
 
Braaapster said:
The starter motor seems mildly anemic but the bike has been starting quite reliably after a few cycles.

The bike is normally parked underground, except at work. With warmer weather now, I’ve had two instances where it seemed like the bike was not going to start when leaving work at the end of the day.

I’ve also been surprised to find the tank being mildly pressurized when refueling at the gas pump. Starting to wonder whether the hot & cold weather starts are being aggravated by tank pressure/vacuum being caused the apparent lack of direct vent line on the tank.

I wonder if the vent line is the plugged hose, hanging under the rear side of the engine case, and whether the plug is some Euro 5 BS that is intended to force venting through a restrictive evap canister.

Thoughts?
Click to expand...

Hello: I have had the same issue as you. Usually starts normally every time, when hot or cold. It’s when it’s sat all day in the heat (shade or open) like after leaving work. It acts like the battery is dead for the first attempt at starting ( check battery voltage = 13.3V). Then next try it turns over normally however it won’t start. It eventually does start after about 6 tries and acts like a flooded carbureted bike until it clears itself. It has happened about 5 times in the last 3 weeks and 1500 km. Last time it threw an engine fault. I will get the fault code read in the next couple days and report back.
 
Totally seems like it’s flooded.

I’m away from the bike for the next three weeks, but next chance I’m gonna open the gas cap (to “burp” the tank) before I turn on the ignition and fuel pump.

I’m wondering if the injector dribbles a lot during the power up / boot sequence.
 
Might even start burping it after each ride, just to see if that makes a difference.
 
Thanks for your reply. For me after the first time it happened I opened the gas cap snd there wasn’t any apparent pressure buildup, but maybe I didn’t notice it. Good to know I am not the only one experiencing this!
 
I been burping the tank before every ride. Lots o' venting and fumes but no problems with starting anymore.

If this is the fix then I'm thinking Ducati can probably remedy with a minor firmware update; I suspect they may be cycling the injector on boot.
 
Only been out for 3 rides on mine and last ride bike was difficult to start after it had been in garage overnight then OK all day and nearly didn't start after last petrol stop of the day, had to leave it a couple of minutes and tried again.
Be interesting to see what dealer says as it's in for first service on Thursday
 
You've only put three rides on the bike and it's going in for the 600 mile service? Lol, my ass aches just imagining anything over 100 km.

You get my vote for honoris causa membership in:

1727810797134.png
 
I was out for 8 hours on sunday to get the miles on ready for it's first service. Didn't think it was that uncomfortable although it's certainly not a long distance tourer.
 
Did you ever find the solution for your issue?

Went to leave for work this morning and the bike wouldn't start. It cranks over like normal, tried burping the tank, but no luck.
 
Gil_, My reluctant starts were gone once I started burping the tank on hot days. Changing to the sprint filter and open airbox lid might have helped, or maybe it just needed 2500 miles to loosen up a bit. Now that cold (below freezing) weather is here, the starter motor can seem a little sluggish, but it's still way better than when it was acting up. An OBD2 scan tool with Euro5 adapter cable might tell you whether you have any sensor issues; it's probably cheaper to buy the tool and DIY than pay the dealer to check it. I can record readings on my bike if the context would help you.
 

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