Author Topic: Cold bike takes long crancking  (Read 2379 times)

Scootyman, iNCORRIGIBLE, MohKraats and 6 Guests are viewing this topic.

Online MohKraats

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Cold bike takes long crancking
on: 20 April, 2021, 08:49:38 AM
Any ideas ??  :187:

To start my bike when cold takes very long crancking. :003:
When warm, it starts after 1 or two rotations. :002:
However, when it has been standing for some time, it can takes up to 10 rotations before it starts. :012: :012:
When I start in two stages, it is better.
That is: just let it have one rotation first time, then second go, it starts in 2 till 4 rotations.

Battery is new, during crancking, voltage stays above 10V.
Plugs are new
O2 value is correct
TPS is checked.
Runs fine once it runs.
Doesn't stall.

Any ideas ? Experience ?  :084:


#1

Offline Art

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Re: Cold bike takes long crancking
Reply #1 on: 20 April, 2021, 09:24:30 AM
Possible condensation in the combustion chambers some recommended reading here

#2

Online MohKraats

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Re: Cold bike takes long crancking
Reply #2 on: 20 April, 2021, 10:27:11 AM
*Originally Posted by Art [+]
Possible condensation in the combustion chambers some recommended reading here

Hello Art,

I will double check,

But
Air filter is as good as new.
My bike rides every day, twice a day.
Its always parked under a roof, at nights in a dry garage.
Behavior is the same, no matter what the weather conditions, and I do ride in pouring rain too.

I did have a carburetor bike (VFR750F) before this one, used it under same conditions.
that one always started during first rotation. Hardly needed to touch the start button.

So, a damp issue sounds very unlikely to me under such conditions.

Anyway, I will take it apart tonight and have a look.

#3

Offline Art

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Re: Cold bike takes long crancking
Reply #3 on: 20 April, 2021, 10:52:39 AM
Riding in the pouring rain  :084:

I'd definitely check the air filter and air filter housing for signs of condensation or moisture. I would also check, drain and clean the crankcase breather tube, its the short closed end clear plastic tube on the front left hand side of the air filter box.

#4

Offline davidjg

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Re: Cold bike takes long crancking
Reply #4 on: 20 April, 2021, 04:33:04 PM
See that you ride your bike  twice every day. Is this for shorter journeys at fairly low revs or longer journeys where you use the the revs (e.g. over 4,500rpm) and put load on the engine. If it is for such longer rides what is the effect on the engine  -is it smooth and unhesitant thought out the ride.

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Offline davidjg

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Re: Cold bike takes long crancking
Reply #5 on: 20 April, 2021, 04:46:03 PM
Forgot to ask, did the problem start quite soon after a fill up with petrol, or haven't you refuelled the tank for some weeks/months.

#6

Online MohKraats

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Re: Cold bike takes long crancking
Reply #6 on: 21 April, 2021, 07:59:43 AM
*Originally Posted by Art [+]
Riding in the pouring rain  :084:

I'd definitely check the air filter and air filter housing for signs of condensation or moisture. I would also check, drain and clean the crankcase breather tube, its the short closed end clear plastic tube on the front left hand side of the air filter box.

Hello Art,

Checked it,
it had some water, so I emptied it, cleaned it,
dried out the filter house, lets it open to damp out, and put it back together again.

No change.
Makes no difference. :003: :003:

#7

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Re: Cold bike takes long crancking
Reply #7 on: 21 April, 2021, 08:04:54 AM
*Originally Posted by davidjg [+]
Forgot to ask, did the problem start quite soon after a fill up with petrol, or haven't you refuelled the tank for some weeks/months.

Hello Davidjg,

I drive it long enough each trip to have it warmed up completely,
driving into Amsterdam each day, with enough traffic, making even the cooling fan kick in once and a while.
And yeah, in this traffic, one needs to open the throttle often enough.
The engine doesn't run as nice as I'd like to, but that seems to be just me.
It runs perfect, according to workshop mechanics.

And, ah yeah,
don't worry about fuel.
I fill up at least once a week, and Ethanol-free only.

And this problem, I can't link it to filling up.
Has been there for a while now.
Started to happen so now and then, grew more frequent, and is now on every cold start.
Last Edit: 21 April, 2021, 08:06:53 AM by MohKraats

#8

Offline Art

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Re: Cold bike takes long crancking
Reply #8 on: 21 April, 2021, 09:22:01 AM
Diagnostics is always going to be difficult on-line. You say air filter is as good as new but don't mention when it was last replaced, maybe that'll be it.

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Re: Cold bike takes long crancking
Reply #9 on: 21 April, 2021, 09:46:16 AM
Hello Art,

Air filter is clean and of the K&N type.

When crancking, it feels like the bike decides quite late to activate either ignition or injection.
When it starts, it starts without hesitation whatsoever.

Tonight, I will try an ECM reset,
See what that brings.