KTM Motorcycles - Popular Questions, Answers, Tips & Manuals

Question edited for clarity. That sounds like it is just a bad connection somewhere or possibly a bad switch. Remove the battery leads and clean the lead contacts and battery posts with a wire brush. Smear with Vaseline and reconnect. Remove the starter leads and do the same. Then it could be the Starter Relay https://www.google.com/search?q=ktm+450+sx-f+starter+relay+location Or Starter Button https://www.google.com/search?q=ktm+450+sx-f+starter+button+replacement ..

That would be like riding a fixed wheel bike.Think about how you will stop and start. Only hydraulic fluid will leak. Bad idea!

personnaly I would replace cylinder with new OEM

All dirt bikes have a VIN. It is on the steering neck. https://www.google.com/search?q=vin+on+my+ktm+300 ..

Have you checked battery connections. Run switch in the correct position? Checked spark plug for debris? Just thinking out loud..

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Drain oil. Use degreaser to clean area. Use JB Weld & allow to set up properly before adding oil.

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Hi, most likely your cdi unit or ignition coil needs replacing.

took me a min or two of WTF-ing to see pic and realize you meant a 2-stroke motorcycle..

try replace spark plugs

It's a bad seal of the head gasket. You need a new head gasket and to scrape every particle of debris from the cylinder head and cylinder surfaces that mate with the head gasket. Use the factory specified gasket sealing compound and do a clean job - no blobs or pools of the stuff. The head gasket should lay flat on the surface of the top of the cylinder, and you have to make this surface free of grit, leftover sealant and any other foreign matter before you put the head in place and torque it down. Start with the head bolts just finger tight and then go by the manufacturer's specs for the pattern and amount of torque to be applied. Usually it is recommended that you get to the specified torque amount in stages, going around several times and repeating the torque pattern until you get that maximum rated amount. This will prevent the seal from shifting or warping and should make the gasket seal perfectly. This is the old school method of doing this job. and I have never seen this fail to produce good results. Take your time, be clean, and you will have the results you want.

Check the clutch, adjust, clean, or replace

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over full sump fuel getting into sump badly worn rings allowing excessive blow by

heat the spark plug up on stove and then try it. it might be you turned it off to soon, think its 2 to 3 min before turning off. floods the sensor.

Sounds like the pressure plate is not fully disengaging.

ok, your problem could be simple or could be quite involved. First thing to do would be to make sure its not a safety cut out i.e. kill switch on handle bar is set to off or is malfunctioning, side stand down while in gear, no neutral light. Also is the battery good?? A poor battery can cause the bike to have no spark as it can act as a resistor and not allow 12v to flow through the system thus preventing enough current for a spark. If its not that, hears where it can get tricky. It could be a number of other things i.e. If it has an immobilizer factory fitted or via an alarm system, Coil (which is usually not the case), Generator stator and pick ups or worse case a faulty CDI/ECU. You may want to get someone who knows about bikes to take a look. Good Luck

.010" inlet hot .012" exhaust hot if water cooled if air cooled add .002" to the measurements

Check the coils if it is fine change sparks plugs should solve the problem

the valve clearance is incorrect at .15mm ( .005") it should be at .010"inlet and .012" exhaust and is set on tdc but on compression stroke tdc decompression cams have a special grind that holds the valve open for starting revolutions and as the engine rpm picks up the cam follower doesn't follow the profile any more and closes the valve engines that utilize such a cam are motors that have a rating exceeding 3 hp on a rope pull otherwise , the piston cannot be pulled over compression past enough to get it started 5 hp lawn mowers , 10-20hp rope pull generators etc have this cam