Question about KTM SX 125 Motorcycles

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I have a 2003 sx125 and thecarb is cracked internally. i found a good 2003 200 exc carb . is there any issues using this as long as i jet it for a 125

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If the carbs are the same inlet and outlet size and you swap the jets, it should work fine

Posted on May 21, 2011


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My 2002 ktm125sx runs awesome revs great until carb bowl fills up then it floods and runs terrible I turn the gas off and it'll scream until it starts running out I've cleaned carb checked float

Hi, Dewayne and the usual suspects are:
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My 2000 ktm 200 will not start

Hi, Aw98628 and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
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5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the enrichner.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
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10. Carburetor float stuck.
11. Fuel injectors clogged.
12. A severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
13. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
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Hi, Roy and the usual suspects are:
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1 Answer

2003 suzuki dr200se will not idle runs great if you keep it above idle. Removed carb, took it apart sprayed jets with carb cleaner. Reassembled and now will not fire. No gas??? Checked everything I can...

If the machine wont idle but the jets are clear, it is possible that you overlooked the carburetor body. If the passageways in the carburetor body are blocked , the machine still will not idle until you blow the body clear. Either there is still dirt in the carburetor, or the intake manifold is cracked or separated in a way that is causing too much air to get into the cylinder. perhaps a closer inspection is in order.

Sep 12, 2010 | 2001 Suzuki DR 200 SE

1 Answer

I have a 91 ktm 300 exc and it bogs down and dies when i isnt choked and at a low rpm

Your carb needs to be cleaned. More specifically, the pilot jet, but if it's clogged it'd be best to go ahead and clean the whole thing.

Remove the carb from your bike and then remove the bowl from the bottom. You'll then be looking at the jets and float valve. The jet causing your issue is the smallest one. Remove it and carefully spray it out with carb cleaner. Then hold the jet up and see if you can see light through the hole and that it appears clean and round-meaning no obstruction left. Locate the mixture screw on the outside of the carb. It should use a flat screwdriver. First turn the screw in and count the number of turns. Then remove the screw, followed by the spring and ,if applicable, a small o-ring. Spray through the hole and make sure it goes through and comes out somewhere. Replace the screw in the reverse order and set to the original setting you counted in the beginning.(rough estimate is 1.5 turns out. Cleanliness is the key to the carb working. So keep it spotless inside and reinstall. This should take care of your problem.

Jun 11, 2010 | 2008 KTM 300 EXC-E

1 Answer

Engine cutting out intermitantly at high revs. Gets worse as engine gewts hotteR. the only coincidental is Ihave just put new rings in and it has started since then. Any Ideas - Andy

Most likely, your main jet nozzle is clogged- causing the engine to starve for fuel at high revs. Remove carb, take the bowl off the bottom and locate the main jet. The main jet is screwed into the main nozzle, which you can't see until it's removed. Remove the nozzle(brass tube with holes down sides that your slide needle goes into) and clean the nozzle and jet thoroughly. Its a good idea to do the rest of the carb the same way while you're at it. Replace the carb. If the carb adjustments haven't been messed with, this should put your little katoom back screaming again.

Jun 10, 2010 | 2002 KTM EXC 200 GS

1 Answer

Wont idle , idle screw does nothing, does not run well unless in 2nd gear and up wide open.

if it does not idle it could be a few things and if it only runs good wide open.. what it probally is, is a clogged jet in the carb.. the pilot jet is clogged because that is slow speed and idel and the main is hihg speed.. so first thing you want to do is take the carb off and check all the jets and clean them.. dont stick anything in them just use spray.. get back to me and let me know how you make out and if thats not it I will send you in another direction

May 17, 2010 | 2000 KTM EXC 380

1 Answer

04 exc 450 wont rev

Pull the slide and move the jet needle clip down 1 or 2 notches.

Apr 21, 2009 | 2004 KTM EXC 450 Racing

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