Question about 2001 KTM Exc-Racing E 520

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2005 ktm 520 won't idle, cleaned carb new diaphram

2005 ktm 520 won't idle idle screw all the waY IN checked air boot no leak, gets very hot when running , raised and lowerd needle, adjusted fuel screw still won't idle

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  • Anonymous Mar 15, 2014

    my ktm 520 exc starts on choke but when i release it cut of i clean my carb but its same can u tell me what to do

  • none
    none Sep 17, 2015

    yeah my ktm 520 exc gets running but the momment the throttle goes it stops, there is almost no idle. note: gets very hot



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Did you try adjusting the air fuel mix screw?

Posted on May 21, 2009


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2006 KTM 65 SX idles too high

Hi, Samantha and the usual suspects are:
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My 2016 ktm 50 sx wont idle and is exceptionally worse once hot. top end new, carb thoroughly cleaned reassembled. new plug and tried another used stator air filter new. have not tried reeds yet

Have you tried an emissions test? That can tell you a lot about how the combustion is doing, and what you would need to adjust at the carburetor. Have you checked the spark plugs?

Jul 26, 2017 | KTM Motorcycles

3 Answers

Why won't it idle without choke?

Fuel supply problem somewhere. How is the float adjustment and the float valve? I'd guess the level adjustment is too low.

Mar 28, 2015 | Honda 2005 TRX 400EX

1 Answer

2008 ktm 250 sxf. Can't get a correct response from my fuel mixture screw. Stripped carby and cleaned, set float level, set Jet needle back to factory settings (4 slots from top was 6) fitted an after

Hi, Anonymous you need to make sure you have no intake leaks by spraying some Brake Kleen, Contact Cleaner, Starting Fluid etc. around the intake manifold and seals, if the RPM's go up or down significantly then you have a leak that needs to be fixed before you can continue with the carburetor adjustment.
The engine should be at operating temperature with the enrichener off to set the idle between 950-1050 rpm. Turn the idle skrew clockwise to increase the idle speed and counterclockwise to decrease the idle speed. If you have access to your air fuel mixture skrew you may turn it as well, if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air fuel mixture skrew clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back the skrew out 1-1/2 full turns to establish a starting point start the engine and check the idle rpm's and turn the idle skrew accordingly for 950-1050 rpm if necessary, turn the air fuel mixture skrew 1/4 turn at a time and let the engine settle for about 10 seconds, turn the skrew clockwise for a leaner mixture and counterclockwise for a richer mixture, you are seeking the highest rpm your air fuel mixture skrew can acquire without going past 3 full turns from bottom then resetting the idle skrew back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture skrew all the way in then your pilot/low-speed jet is too big and needs to be replaced with the next size smaller. Final adjustment should be made with a clean air filter mounted to the carburetor.
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1 Answer

My 2005 dyna fxd super glide wont idle cleaned carb

meetering passages are still abstructed need to boil carb in hot water and use carb cleaner and hi pressure air again if air screw are cap on your model find them remove cap and air screw also need cleaning.Mr Cee's cycle and atv repair.

May 22, 2014 | 2003 Suzuki RM 125

1 Answer


1. check for an intake leak in front of the carb, like broke carb gromet, carb flange o'ring/gasket leaking, or any broken or leaking vacuum lines. If the bike has been sitting for a while or has had little use, the carb is probably plugged up and needs cleaning.

Aug 05, 2012 | KTM Motorcycles

1 Answer

My Husqvi 55 is showing rev fluctuations. starts ok then once warmed up will start loosing power and revs then cut out frequently. Seems to race when first starting then fluctuates or dies . Spark plug ok...

This is fuel starvation, unfortunatley it could be any number of things, from a blocked fuel filter, to an air leak through a gasket or seal, start by removing the fuel filter in the tank and replacing, check the fuel hose from the tank up to the carb, any doubts and replace the fuel line, remove the carb, this is done by removing the two securing screws and a screw in the air fiter back plate foot, remove the pump cover on the carb, this is the alloy cover held with a single screw, clean/replace the filter screen under the diaphram, if the pump diaphram looks aged replace this component, remove the two screws securing the carb back plate to the cylinder, behind here you will find the rubber induction boot, just below that is the impulse tube seal, check both of these components for cracks, replace as required, let me know how things are going, or if you need any more help.
Good luck

Apr 13, 2011 | Husqvarna Chain Saw with 18" Bar

1 Answer

Ltz 250 wont idle needs full choke to run.cleaned carb all jets new diaphrams. cleaned air filter and all hoses. backfires and hesitates half and full throttle.

hi,sounds to me like the air fuel ratio is all up the ***,locate the air/fuel screw on the carb(normally on the side)screw the screw right in untill it stops,then back the screw out 1.5 turns,this should get the bike to run without the choke,once you have the bike running simply turn the screw in or out untill the bike settles into a nice steady idle,should be good to go,hope this helps...cheers

Mar 22, 2010 | 2005 Suzuki 250 SB

1 Answer

I have a ktm 520

check your pipe for some air leak. from head to end of the pipe, if you find leakage put selicon gasket. or your carb is not in good tune try to reduce the air in take. in the card there is a adjustable screw try to turn it clockwise a little bit then tyr full throtle. if nothing happen try the screw again...

Aug 18, 2009 | 2001 KTM Exc-Racing E 520

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