Question about Motorcycles

1 Answer

KTM 400 exe 2002 full throttle fuel starvation

At full throttle engine starves and cuts out. Once revs drop engine runs again. At low rpm no problems.

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 5 Answers

It sounds like your float in your carb is getting stuck at high rpms. Try taking the bowel off and pushing the float up(make sure to have a bucket for fuel to run into). If it sticks that's the issue an easy fix.

Posted on Dec 11, 2012

Ad

6 Suggested Answers

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

Ad
  • 126 Answers

SOURCE: engine runs, but it will not rev up past 2000-3000 rpms,

are you turning the choke off after its warmed up? most will not run with the choke on and warmed up.

also try running it with the gas cap open to see if you have a vent issue in your tank. if air can't get in, then gas can't flow.

if not a choke or vent issue, then try this. turn the petcock off and then disconnect the fuel lines one at a time going into the carb. start with carb fuel line #1 disconnected (and the rest connected) and in a coffee can, turn petcock on and ignition too. fuel pump should come on momentarily and inject some fuel. see how the quantity looks. reconnect the line to carb #1 and repeat for carbs #2 - #4. your looking for a decrease in fuel to a couple of cylinders.

if all looks fine, i would then focus on the carb floats & jets. have the carbs been off for a good cleaning lately? modern fuel breaks down quickly and could cause a gumming condition in the carbs. spraying the sea foam or carb cleaner into the carbs is bypassing the everything in the carb bowl (but it means the spark plugs are ok) so there could be an obstruction. i would look there first.

if uncomfortable removing the bank of carbs, you can try a quick fix first. with the petcock closed, open the drain screws of each carb and let the gas drain out. go and buy some yamaha carb cleaner (liquid in a black bottle) at a yamaha motorcycle dealer. mix it in a separate container with gas as recommended. close the drain screws on each carb. pour the mixture into each fuel line feeding the carb and let it sit overnight. DO NOT POUR THIS MIXTURE INTO YOUR TANK. its not a fuel additive, but a cleaner that will not harm orings or gaskets, but it will not ignite with a spark plug. open the drain screws the next morning and let the mixture pour out. reconnect the fuel lines to the carbs and test drive it.

if that didn't work, then removing the carbs for a good cleaning is my next step. good luck.

Posted on Jan 28, 2009

  • 68 Answers

SOURCE: engine running problem- will only run at over 2500 rpm.

Try to cheeck the connection of the speedometer.

Posted on May 18, 2009

MakisRC51
  • 408 Answers

SOURCE: Engine drops off at high RPM. 5700 miles. I don't think its the torque limiter. It seem like a fuel starvation problem.

So check the fuel pump.And fuel filter.

Posted on Jun 04, 2009

  • 2 Answers

SOURCE: My KTM lc4 640 running problems

Check your valves. they might be tight. possible shimming required there to get them back to spec

Posted on Jul 01, 2009

  • 10 Answers

SOURCE: 2002 speed triple 955i - when opening the throttle

There can be multiple reasons for this. Low fuel presure is one cause of this.

If you had dropped the bike the impact can loosen the fuel lines inside the fuel tank. Issues with the fuel pump can cause a low fuel presure. In my case the fuel line was loose but still pushing some fuel into the lines. There is no issue a low rpm cause there just enough fuel to run it at 2000 rpm or lower but not enough pressure to run well at high RPM.

Posted on Aug 10, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Saw starts runs good then when i start cutting it


Hi Jason:
Make and model might help but here's two ideas:
1) Remove muffler and clean it. They can get plugged up with carbon and the saw will run at low RPM but will quit because of excess back pressure when you try to rev it up.
2) Set the high and low speed carb settings. Start the saw then gradually increase engine speed until full throttle. Screw the hi-speed needle in slowly. If RPM immediately drops, back it out until Rpm increases, then starts to drop. Screw back in until peak rpm reached, then starts to drop. Back out to peak, then 1/3 turn more.
Set low speed so engine runs smoothly but chain does not turn.
Hope this helps.

Feb 01, 2016 | Garden

1 Answer

Yamaha yp 400 2005 majesty will not go faster than 50 mph and revs no higher than 4500 rpm what is the problem?


Fuel starvation? Twisted or kinked fuel line? Some may be getting through to run the engine but not enough under load. Throttle adjusted properly? Only enough movement for low rev range.

Oct 11, 2015 | Yamaha Motorcycles

1 Answer

Why do the rpms stop between 2500-5000 on a 2002 Lincoln LS


There are a few reasons to limit RPM which can be a "Limp home" mode activating. But most show a code of some sort with a dash light. Another area is the automatic braking for the "Traction control" which in some models can also have a control to throttle the engine down to prevent wheel slippage.

Blocked catalytic converters can limit RPM by choking the exhaust flow. You have crankshaft and camshaft sensors which count the RPM and send signals to the brain and the fuelpump. Your crankshaft sensor regulates the fuel pressure and if it miscounts, the engine can be fuel starved.

Not all scanners are the same. One that reports fuel pressure while simultaneously reporting RPM would be something to know for fuel starvation.

You can kind of eliminate some possibilities by whether "Check engine" or "Traction control" warnings are on.

Feb 04, 2015 | 2002 Lincoln LS

1 Answer

My 1997 ktm 250sx runs smove but wen u give it a fist full there is now power band just shonds like its missing eney help just going round is sercules thanks


All being as it should it is either ignition or fuel problem. Check air filter is clean or take for run without to see difference. Do a hard cut to check spark plug reading for lean out or fouling (run engine open throttle until high revs snd cut ignition while closing throttle and pulling clutch in to stop engine. Check plug lead. Change plug. Ignition grounded. All the basics

Nov 07, 2014 | KTM Motorcycles

1 Answer

I have a 1997 exc 250 ,about 12 months ago i had the motor in for a complete rebuild, since then i have had nothing but troubles, my latest problem is i start the bike it idles nice when you start reving...


THIS SOUNDS LIKE A CLASSIC FUEL STARVATION, PROBLEM
CHECK FOR RESTRICTONS IN THE FUEL LINE, FUEL TAP, AND THROTTLE BODY, YOU MAY BE ABLE TO REMOVE A DRAIN SCREW IN YOUR THROTTLE BODDIES TO LET OUT ANY OLD FUEL OR WATER WHICH MAY HAVE FOUND ITS WAY IN TO THE SYSTEM,

Sep 09, 2010 | KTM EXC 250 Motorcycles

1 Answer

BMW 650 Dakar. Sudden high revs and the engine shuts down


It would appear that you probably have a fuel starvation problem, if the engine is running normally and suddenly revs up and cuts out this points to a very weak mixture then fuel starvation. I would suggest that you clean your fuel lines and tank etc.

Jun 25, 2010 | 2006 BMW F 650 GS Dakar

2 Answers

2002 Hyundai Elantra 100k miles - 2.0l - running rough


sounds like the throtle position sensor is miss alined or the idle screw is backed off

Dec 16, 2009 | Hyundai Motor 2002 Elantra

1 Answer

My KTM lc4 640 running problems


Check your valves. they might be tight. possible shimming required there to get them back to spec

Jul 01, 2009 | KTM LC 4-E 640 Enduro Motorcycles

1 Answer

Engine running problem- will only run at over 2500 rpm.


Try to cheeck the connection of the speedometer.

May 18, 2009 | 2008 KTM 690 Enduro

1 Answer

2002 speed triple 955i - when opening the throttle from low revs the engine bogs. the fuel map is correct - any ideas?


There can be multiple reasons for this. Low fuel presure is one cause of this.

If you had dropped the bike the impact can loosen the fuel lines inside the fuel tank. Issues with the fuel pump can cause a low fuel presure. In my case the fuel line was loose but still pushing some fuel into the lines. There is no issue a low rpm cause there just enough fuel to run it at 2000 rpm or lower but not enough pressure to run well at high RPM.

Apr 17, 2009 | 2001 Triumph 955i Speed triple

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

135 people viewed this question

Ask a Question

Usually answered in minutes!

Top Motorcycles Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4536 Answers

yadayada
yadayada

Level 3 Expert

76649 Answers

kakima

Level 3 Expert

102366 Answers

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

Answer questions

Manuals & User Guides

Loading...