20 Most Recent 2005 KTM EXC 450 Racing - Page 5 Questions & Answers

Hi im guessing your year to be 1981 or 1982.First if you have not done so make sure your coil is grounded.Next disconnect your kill switch.Next check the primary side of the coil .3 to .5 ohms check the secondary side of the coil 5k to 7k ohms with out the spark plug cap.While your at it check for spark with out the cap.Make sure your kicking it fast as motoplats do not spark below 700 rpm.If all else fails you have a few choices .Vance smith can rebuild yours for under 200.00 usally.You can go with a pvl ignition for around 500.00.Also make sure your crank bearings are tight and your mag side crank seal is not leaking if you smell fuel in the mag cover you need to replace your crank seal good luck

run a compression check to see if it is low. If low squirt some oil in cylinder and rerun. If it stays low possible valve guide problem. If oil fixes compression then the rings are bad.

A backfire is unburnt fuel igniting. Check you have no air being drawn into the engine through a split in the carb rubbers or a loose carb rubber clamp. The easiest way is to let it idle/tick over and spray some carb cleaner around the rubbers. If the engine stutters or stalls then this is where the leak is. An unsealed collector box will cause this to happen as well so check that your exhaust system is correctly sealed and fitted.

replace the throttle spring and take the handle off and grease in there

Hi,again so its not hidrolic clutch its a cable so this should be easyer to sort out just follow the advice I gave in your first question. good luck

Is it a rotax engine ?

http://www.pdfmotomanual.com/index.php?r=site/page&view=manuales&order=t&key=K&make=2016&lang=ENG Loads on the above link for a 450 EXC

First check the gas. Then go for the electrical system.

There is no fixing a head gasket. Replace it.

first replace the fuel filter.

That is an annoying problem, huh? Have you properly adjusted the clutch freeplay both at the handlebars and at the clutch arm? If you are still having trouble getting the clutch to let go, you might consider checking to see if the clutch springs are shot, but I doubt this on such a new bike. In fact I'm curious if you have a cable clutch at all, or if you have a special hydraulic setup. Anyway, once you get the clutch operating you can get out of 5th gear by pulling the clutch and rocking the bike back and forth while shifting down. Do this with the engine off.

thats easy take clutch cover off and watch how the plates are on and just copy it excactly the same

sound to me like the clutch slave cylinder. follow the pipework down from the bars to the casing. Unbolt the slave cylinder and im guessing it will be covered in break fluid. new slave cylinder is the answer hope this helps

You might find the manual and wiring here.. http://www.manualedereparatie.info/en/categorii/ktm.html please rate me if this helps. Thanks

Check for a good strong spark at the plug itself. If its not there you have a bad coil, loose, broken, corroded wires or bad grounds.

Your model ran the same engine to 1997, then changed to the engine which ran from 98 to now. The 150SX engine bolts straight in too..

has some one messed with the idel screw???

By the V.I.N. number. Write it down and call a dealer or look it up online.

Compression test is read in psi and a leak down test read in % leakage. 20% leakage is not good. with the leak down gauges in place, listen at the carb or end of the exhaust and in the oil fill hole for leaking air. That will tell you if you have a bent valve or broken ring.

check with a squirt of oil down plug hole, then re test see how high it goes then, could be the top ring gone, if this is the case it may need a glaze buster to remove any slight lip that has worn in, or a rebore.