Question about KTM Motorcycles

1 Answer

2003 KTM EXC 250 hard to start. Heavy kicking full throttle choke closed finally starts. 4 stroke. Revs high then low and dies what do I need?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • KTM Master
  • 14,855 Answers

That sounds like a loose hose or bolts between the carb and the cylinder. Classic symptoms of hard starting, revving and dies. If not that, strip and clean the carb.

Posted on Dec 12, 2016

Testimonial: "Thanks want to order float needle and seat. Cannot identify model of carb?"

  • Andrew Taylor
    Andrew Taylor Dec 12, 2016

    It is unlikely to be the needle and main jet. That only comes into operation after you have started and open the throttle. Choke jet does started in conjunction with less air and more fuel. Then you close the choke and the idle jet runs the engine with a small jet and minimal air. When you are running under power, you are using needle, main jet and varying amounts of air from the slide in the carb.

    Check for air leaks getting in. This really is the classic symptoms of air in the intake manifold.

    Make of carb is probably inside the float bowl, the top of the slide or around the neck of the carb.

    This says your bike is a 2 stroke?http://www.bikez.com/motorcycles/ktm_250...

    and this one says it is 4 stoke, or suggests it is.http://www.dirtrider.com/tests/off-road-...

    Carb is a Keihin. Here is your service manual.
    http://www.carlsalter.com/pdfs/KTM_250-5...

  • Andrew Taylor
    Andrew Taylor Dec 12, 2016

    Your carb details are on Page 137. It has a throttle position sensor. Hate electronics on bikes!

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2006 KTM 65 SX idles too high


Hi, Samantha and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector.
10. Multiple carburetors not in sync.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
2006 KTM 65SX issue
KTM idle issues
How to Tune Adjust KTM 2 Stroke Carburetors
KTM 65 SX 2009 Repair Manual
http://www.partsfish.com/page/oem-parts-for-ktm
KTM 65 SX 2006 Owner Manual

Aug 14, 2017 | 2006 KTM 65 SX

1 Answer

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:
1. Dirt or other foreign matter between float valve and its seat.
2. Float valve sticking.
3. Float valve and/or valve seat worn or damaged.
4. Float misadjusted.
5. Float cracked, leaky or damaged.
6. Excessive "PUMPING" of hand throttle grip.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
KTM Flooding won start Why
How to Tune Adjust KTM 2 Stroke Carburetors
KTM Keihin Carb How To Jets Needle Clip Floats PART 1
1999 2003 KTM 125 200 SX MXC EXC Service Manual Moto Data Project

May 15, 2016 | GAS Motorcycles

1 Answer

Ktm250excf throttle lag at low revs


100% the issue is too much air. get your carb checked, reduce air intake.

open the air intake on the carb about 4 full turns then start the bike. if it does not want to start open the idle bring it up at least 5 turns. when it start at a very high rev, start closing the air intake slowly until you feel and hear you have hit the right spot. adjust your idle in the process.

Dec 24, 2009 | 2008 KTM 250 EXC-F

1 Answer

How do i start my ktm 450sx thats a kick start model 2006


get the kick start so its just about to go on the compression stroke and stand on the kick start and rev it as it dioes it remember there are 4 strokes and 1 firiung stroke also use the choke on cold starts for 30n seconds

Oct 22, 2009 | 2006 KTM 450 SX

1 Answer

2007 honda crf 250 r hard starting when cold ,


There is a proper way to start an engine. Most bikes have four controls to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. Go ahead and give it another primer shot after the 5th kick attempt. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Sep 23, 2009 | 2005 Honda CRF 250 R

1 Answer

2005 ktm 525 sx is hard to kickstart , is there any trick to maket it more easy to kickstart?


Yes, there is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Jun 07, 2009 | 2006 KTM 525 SX

1 Answer

2005 250 f 65 kicks to start


Several things can cause the problem. First, spring for a new spark plug. The stock plug is NGK CR8E. Now the plug is eliminated as a problem. Next, pull the slide out of the throat of the carb. Now remove the jet needle. Put the needle clip on the 4th notch, (this is the stock setting). Use only premium gas. Next, follow the starting instructions below.

There is a proper way to start the engine. Four controls are on your bike to assist in starting.
  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Release the de-compression lever and give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery and clean air filter will also aid in starting.

This will likely tame the beast for you. Please rate this answer. Thanks!

Jun 06, 2009 | 2003 Yamaha YZ 250 F

3 Answers

Ryobi 31cc lawn trimmer carb adjustment


As with all 2 strokes if you have compression and a reasonable spark, you only need fresh fuel with correct oil ratio) and they must go !(as long as you haven't fiddled first and all gaskets are sealing) I start mine by(1) pumping the primer till it is firm,(2) full choke,(3) pull till it kicks ONCE,(4) half choke, pull till it runs,allow to warm up and(5) switch to run (you may need to apply a bit of throttle while pulling as in (4)(or give it a few more pumps if it dies) If all is ok, check that when properly warmed up there is a smooth transition from idle to full revs, if it hesitates it may need the LOW SPEED mixture leaning (clockwise) SLIGHTLY.If it dies the LOW SPEED mixture may need richening(anti-clockwise)(adjust 1/8 turn at a time) Make sure that motor is just peaking at full revs and is on the RICH side of peaking (HIGH SPEED mixture)(this will avoid seizing it Adjust both till it revs cleanly and is JUST rich at full, and idleing nicely and it should start without too much trouble.(If you have fiddled and are lost,-about 2 1/2 turns out from closed on both needles should get you started)

Nov 23, 2008 | Garden

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

20 people viewed this question

Ask a Question

Usually answered in minutes!

Top KTM Experts

yadayada
yadayada

Level 3 Expert

75822 Answers

Arnie Burke
Arnie Burke

Level 3 Expert

4514 Answers

Brian Anderson

Level 3 Expert

356 Answers

Are you a KTM Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...