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Old 11-09-18, 11:21 AM   #11
Bibio
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Default Re: Cutting out as pulling up to junctions

it sounds like classic intermittent clutch switch failure.

by and large the K7 onwards bikes electrics are bomb proof unless someone has been fiddling... with the high idle and the occasional cutting out its pointing to the clutch switch. another common problem that gives the same symptoms is the thermostat switch.

BTW the clutch switch can read fine with a DMM at one time of day then read fubar at another.

to test the clutch switch you need to disconnect the connector then test for continuity with the lever in and out, out should read no continuity, lever in should read with continuity. if both read with or without at the same time then a new switch is required.

with things like tip over, kill switches and such the bike wont even turn on and all you will get is lights etc.etc with no "priming" sound.
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Old 11-09-18, 02:25 PM   #12
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Default Re: Cutting out as pulling up to junctions

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Originally Posted by Bibio View Post
it sounds like classic intermittent clutch switch failure.

by and large the K7 onwards bikes electrics are bomb proof unless someone has been fiddling... with the high idle and the occasional cutting out its pointing to the clutch switch. another common problem that gives the same symptoms is the thermostat switch.

BTW the clutch switch can read fine with a DMM at one time of day then read fubar at another.

to test the clutch switch you need to disconnect the connector then test for continuity with the lever in and out, out should read no continuity, lever in should read with continuity. if both read with or without at the same time then a new switch is required.

with things like tip over, kill switches and such the bike wont even turn on and all you will get is lights etc.etc with no "priming" sound.
That's how I tested it. I wiggled the lever as I was doing it, must have operated it 50 times. Cleaned the contacts up and reconnected. Checked all the other plugs and tip over and that's all fine. Come to think of it the temperature wasnt as consistent as I normally see. What's the best way of testing the thermostat other than running it up to temp and waiting for it to open?

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Old 11-09-18, 02:29 PM   #13
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Default Re: Cutting out as pulling up to junctions

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throttle cable free play? presumably its cutting out when hitting the throttle stop, or adding throttle?
Throttle cable free play seems fine, the first time it happened I had just rolled off the second time it had been off for a little while.
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Old 11-09-18, 02:31 PM   #14
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Default Re: Cutting out as pulling up to junctions

the first thing you need to do is see if there are any fault codes by placing the bike into dealer/service mode. there are lots of threads around the internet on how to do this.

if no codes show up then its minor which could ba a whole host of things from TB sync to TPS position etc.etc.
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Old 11-09-18, 02:33 PM   #15
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Default Re: Cutting out as pulling up to junctions

just to be clear for everyone else. the bike is a twin spark so diagnosis is different as the twin spark has auto idle etc.etc. even wet front plug syndrome dont show up as much due to the bike having two plugs per head.
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Old 11-09-18, 02:42 PM   #16
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Default Re: Cutting out as pulling up to junctions

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Originally Posted by Bibio View Post
with things like tip over, kill switches and such the bike wont even turn on and all you will get is lights etc.etc with no "priming" sound.
Not true with the tip over if it's merely fallen off it's mount. It will fairly randomly cut out and often make the bike cut out under G forces - most commonly when braking. I'm guessing this is due to it physically moving around.
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Old 11-09-18, 03:02 PM   #17
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Default Re: Cutting out as pulling up to junctions

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Originally Posted by Bibio View Post
the first thing you need to do is see if there are any fault codes by placing the bike into dealer/service mode. there are lots of threads around the internet on how to do this.

if no codes show up then its minor which could ba a whole host of things from TB sync to TPS position etc.etc.
Thanks to everyone for the replies I will have a look at how to do the dealer mode and report back.
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Old 11-09-18, 03:30 PM   #18
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Default Re: Cutting out as pulling up to junctions

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Originally Posted by Bibio View Post
the first thing you need to do is see if there are any fault codes by placing the bike into dealer/service mode. there are lots of threads around the internet on how to do this.

if no codes show up then its minor which could ba a whole host of things from TB sync to TPS position etc.etc.
Wont the FI light be up if theres codes to be read?
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Old 11-09-18, 03:40 PM   #19
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Default Re: Cutting out as pulling up to junctions

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Wont the FI light be up if theres codes to be read?
no.
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Old 11-09-18, 03:57 PM   #20
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Default Re: Cutting out as pulling up to junctions

No fault codes present.
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