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1998 ktm 620 sc 4 stroke keeps backfire in an cutting out on me when i come to stop plus ive tried ajusting the tick over but its still revs high an cuts out

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

ollie reece
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SOURCE: tranny oil type

use silkolene light gear oil buddy

Posted on Apr 03, 2009

  • 3567 Answers

SOURCE: quad bike keeps cutting out


ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There may be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!

Posted on May 17, 2009

  • 11 Answers

SOURCE: hard to kick plug in/out backfires possible causes

check vale clearins if that fails check statour / pick up . make shour it hasent broke the woodruf key in the fiy wheel

Posted on Jun 07, 2009

  • 5 Answers

SOURCE: ktm 900,runs for about 5 miles at a time,then

when it runs how does it run

Posted on Aug 10, 2009

  • 1 Answer

SOURCE: hard to start cutting out 2007 r1

hi, if the 2007/2008 r1 spins fast but chgs and has to be coakst with the throttle to keep running and cuts out when the throttle is closed then it maybee due to the battery, i have fixed lots of them now afterm much fault finding by fitting a new genuine or yuasa battery. The problem is that all the power is being used to spin the engine and even once started there is not enough voltage to fire the spark and injectors properly and the charging system has not yet been able to pull the battery up. REPLACE THE BATTERY IT WILL SORT IT, PAUL (YAMAHA DEALER)

Posted on Feb 14, 2010

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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?


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.

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I have a 125 pit bike and it ticks over fine but when you rev it it backfires does any body no how to fix it.


You can check ur values but some bike do make a we ticking from the values and it will back fire when revved up because of the extra fuel once revved that hasn't brine burn as it revs back down to idle speed.

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Why wont my chainsaw tick over, it revs up but not tick over. also, cannot start it after 2-3 mins of usage, why?


Check the air cleaner and muffler for plugging. Try turning the idle speed screw (not the L jet screw) CW one full turn. Does it now idle? If the chain keeps turning at idle, back off the speed screw until the chain stops after revving the engine. When the engine won't start, remove the spark plug and check for blue, snappy spark. If the plug insulator is black, try a new correct type plug. If sparks ok, then squirt some fuel mix into the plug hole, replace the plug and try to start. If you get a pop or two, then fuel delivery is a likely problem. If it again runs, the plug may have been the problem. Otherwise, check the fuel filter, fuel line, and carburetor for any loose fasteners. Finally, run the engine at full throttle--it should 4-stroke with no load, but immediately 2-stroke when cutting. Adjust the H jet needle to achieve this. hope this helps!

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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

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Hard to kick plug in/out backfires possible causes


check vale clearins if that fails check statour / pick up . make shour it hasent broke the woodruf key in the fiy wheel

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Trying to connect the wires to a 95 ktm lc4 620 dirt bike.The wires go to the back of the ignition switch>The wires are color coded I need help please. i cant seem to find the right model and year on the...


This is for a 2000 400/640 ignition for KTM 640 lc4-e. Looking from the perspective of rider seated on motorcycle we have the following colour coded wires going from left to right.: 1. r/w (red/white) 2. bl (blue) 3. o (orange) 4. g (green) 5. ge (Yellow) .6 g/s. (green/black). Hope this can steer you in the right direction Brisenod. From Flabbycat

Apr 16, 2009 | 2002 KTM LC4 625 Sc

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