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Author Topic: KTM 640 carb model - cut out when opening throttle - Please help.  (Read 820 times)

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Offline Goggakop

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  • Location: Western Cape
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Hey Wild Dogs
Please help!
This is weird my 2002 KTM 640 carb model will start fine but cut out as soon as I open the throttle, if I open the choke and open the throttle it will pick up rev's fine but have no power when attempting to ride it!

Offered it to a buddy for the Buff and have to fix it today!  ;D
 

Offline witblitz

Re: KTM 640 carb model - cut out when opening throttle - Please help.
« Reply #1 on: March 20, 2014, 11:42:24 am »
Is the bike in nuetral when you open the throttle or is when you trying to pull away that it cuts out?

If it cuts out when you try and ride it, it could be your side stand switch. Follow the side stand switch wires. They will get to a joint (lugs), pull the lugs apart and short them.
 

Offline Goggakop

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Re: KTM 640 carb model - cut out when opening throttle - Please help.
« Reply #2 on: March 20, 2014, 11:48:16 am »
Thanks witblitz.

Have checked that already.For sure not the side stand switch.
 It will idle happily but cut out when the throttle is opened. if I open the choke it will idle and pick up revs happily when opening the throttle. it have no power when riding it.
 

Offline Beebop

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Re: KTM 640 carb model - cut out when opening throttle - Please help.
« Reply #3 on: March 20, 2014, 11:51:18 am »
Sounds like fuel starvation..
 

Online Dux

Re: KTM 640 carb model - cut out when opening throttle - Please help.
« Reply #4 on: March 20, 2014, 11:59:40 am »
I am going to be on the road for a short while , call me at about 14H00 - 073 232 5389
Motoworx
motoworx1@gmail.com
073 232 5389
Unit 6 Viben square
8 Viben Road , Brackenfell
 

Offline Goggakop

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Re: KTM 640 carb model - cut out when opening throttle - Please help.
« Reply #5 on: March 20, 2014, 12:13:59 pm »
Will do - thanks.
 

Offline ktmmer

Re: KTM 640 carb model - cut out when opening throttle - Please help.
« Reply #6 on: March 20, 2014, 12:23:02 pm »
main jet is blocked
 

Offline Goggakop

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  • Location: Western Cape
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Re: KTM 640 carb model - cut out when opening throttle - Please help.
« Reply #7 on: March 21, 2014, 01:18:56 pm »
Found the problem!

It was a hairline crack on the rubber hose connecting the carb to the barrel!

Thanks to all for the help!
 

Offline Goggakop

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Re: KTM 640 carb model - cut out when opening throttle - Please help.
« Reply #8 on: May 07, 2014, 11:31:18 am »
Found the problem!

It was a hairline crack on the rubber hose connecting the carb to the barrel!

Thanks to all for the help!

Not completely true - the carb needle was broken! Yes in two sections! Right below the c Clip!
 

Offline sventer

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Re: KTM 640 carb model - cut out when opening throttle - Please help.
« Reply #9 on: July 28, 2014, 11:10:18 pm »
I happened to develop the same problem in April this year. This was on my way to Mosselbay. The needle broke off and got stuck. The end result was a snapped chain and front sprocket damaged. Not nice!
Face your fears and live your dreams
 

Offline Beebop

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Re: KTM 640 carb model - cut out when opening throttle - Please help.
« Reply #10 on: July 28, 2014, 11:19:53 pm »
I happened to develop the same problem in April this year. This was on my way to Mosselbay. The needle broke off and got stuck. The end result was a snapped chain and front sprocket damaged. Not nice!
OK I'll bite.....how ?????