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Old 26-05-18, 12:47 PM   #1
ejohnh
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Join Date: Oct 2006
Location: Porthcawl Wales UK
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Default K1 starts but cuts out after a second or two.

Hi,

I haven't visited the site for ages.

My bike is a K1 650 naked with no mods. It's done 32k miles .

I dropped it in the Picos Europa a a couple or three years ago and it developed an oil leak. I managed to ride it back home where I sort of left it in the garage. I decided to 'sort' it.

It would not start.

I first examined the spark plugs which seemed to be fairly worn. I changed those. And tried to start the bike again; it started immediately but cut out after a second or so.

I checked the fuel flow from the tank to the fuel pump and from the fuel pump outlet. Fuel pumping out okay.

The bike starts as I said above, after it's been left for a while, but cuts out almost immediately and then wont start at all (for a while).

Any ideas guy?

Thanks

John
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Old 26-05-18, 12:59 PM   #2
Seeker
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Default Re: K1 starts but cuts out after a second or two.

If you left it in the garage for a while, your petrol may be stale and/or your carbs have been gunked up by the ethanol they stick in these days. You could drain the tank, add fresh petrol and try again but I suspect you will end up having to clean the carbs.
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Old 26-05-18, 01:42 PM   #3
netsurfer
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Default Re: K1 starts but cuts out after a second or two.

Sounds like fuel may be ok if itís firing up. If fuel getting to carbs then Iíd guess stuck float needles.

Carbs off and a rebuild should help this.

One other thought

Does the engine stop suddenly or run a little rough before stopping? Would by any chance it have been run low on oil after you dropped it?




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Old 26-05-18, 03:27 PM   #4
ejohnh
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Default Re: K1 starts but cuts out after a second or two.

Thanks for the reply.

It stops as if it's just run out of petrol, with no indication of roughness.

How difficult is it to get gaskets etc for a bike of this vintage?

It did develop a small oil leak after the drop. Semi crushed the radiator as well, but that isn't leaking.

I think it must be a carb fault. Not looking forward to dismantling those

J







Quote:
Originally Posted by netsurfer View Post
Sounds like fuel may be ok if itís firing up. If fuel getting to carbs then Iíd guess stuck float needles.

Carbs off and a rebuild should help this.

One other thought

Does the engine stop suddenly or run a little rough before stopping? Would by any chance it have been run low on oil after you dropped it?




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Old 26-05-18, 04:10 PM   #5
ejohnh
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Default Re: K1 starts but cuts out after a second or two.

Thanks for the reply..

I'm coming to the same conclusion myself because the initial fire up is perfect; both pots fire for a couple of seconds, and then stop as if the petrol ran out.

J

Quote:
Originally Posted by Seeker View Post
If you left it in the garage for a while, your petrol may be stale and/or your carbs have been gunked up by the ethanol they stick in these days. You could drain the tank, add fresh petrol and try again but I suspect you will end up having to clean the carbs.
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Old 26-05-18, 04:56 PM   #6
netsurfer
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Default K1 starts but cuts out after a second or two.

Itís surprisingly easy, it appears daunting at first glance!

Iíve got the carbs off mine (a K1) put them on and taken them off again without issue.

Once the tank and airbox is off the maze of pipes and cables looks scary, but just work through them one by one and take photos if not sure. Routing is important and thatís what caused me a bit of an issue but a few photos will avoid that for you.

Remember to plug the inlets with plastic bags or clean rags after the carbs are off as you will cause yourself 10 times the work if something drops in there.

I have a Haynes manual here so feel free to drop me a dm if you need to see it.

Cheers and good luck!




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Old 26-05-18, 05:03 PM   #7
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Default Re: K1 starts but cuts out after a second or two.

Are you using choke?
How does it respond on choke - does it fast idle briefly before stopping.
Once it's started does it respond to throttle?
How long do you have to wait before it will restart?
Have you tried starting it with the petrol filler cap open?

Carb rebuild kits are available for the curvy. Be careful with the carb screws they tend to be quite soft and are JIS headed not Philips although they look similar. Once you get the float bowls off you'll get a better idea if it's a dirt issue.
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Old 26-05-18, 05:20 PM   #8
SV650rules
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Default Re: K1 starts but cuts out after a second or two.

I would try fresh petrol with a good glug of Redex added (overdose won't hurt) it is amazing how it dissolves the petrol lacquer and gunge. Redex has revived a couple of carbed bikes for me and also worked wonders on generators and lawnmowers, bringing them back from the dead.
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Old 26-05-18, 05:33 PM   #9
netsurfer
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Default Re: K1 starts but cuts out after a second or two.

B3C sell a product specifically for this situation called ďmechanic in a bottleĒ I work for one of the UK distributors of the product so if you would like to try it give me a shout I will send you one over to try prior to stripping the carbs.

May just save you the hassle.






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Old 26-05-18, 08:50 PM   #10
ejohnh
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Default Re: K1 starts but cuts out after a second or two.

Thanks,

I've got a Haynes Manual. I've had it since I bought the bike in 2006. It's dog eared and pretty black and greasy in places.

I was wondering what O rings or washers I would need to replace.

I guess I'll get down to it in the coming week.

Thanks,

John




Quote:
Originally Posted by netsurfer View Post
Itís surprisingly easy, it appears daunting at first glance!

Iíve got the carbs off mine (a K1) put them on and taken them off again without issue.

Once the tank and airbox is off the maze of pipes and cables looks scary, but just work through them one by one and take photos if not sure. Routing is important and thatís what caused me a bit of an issue but a few photos will avoid that for you.

Remember to plug the inlets with plastic bags or clean rags after the carbs are off as you will cause yourself 10 times the work if something drops in there.

I have a Haynes manual here so feel free to drop me a dm if you need to see it.

Cheers and good luck!




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