Question about 2004 kawasaki KX 250 F

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Why does my kx250f pipe get red hot to where it melts and the exhaust starts too pop so why does it do that?

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Several things are possible. The baffles inside the muffler may have partially collasped causing a restriction in the exhaust. The fuel / air mixture may be too lean. A lean mix burns hot. The stock main jet is a #178 (stamped on the jet). Try a richer jet, #180 or #182. Also, use only premium gas without ethanol. Be sure your gearbox oil is clean 10 w 40 motor oil. NO SYNTHETIC LUBRICANTS. Check the radiator coolant flow and temperature to be certain the engine is getting cooled as it runs. Be sure mud /trash is not blocking the radiator fins. Also check the spark plug. The stock plug is an NGK CR8EB. Replace it with a colder plug, NGK CR9EB

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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Rear jug getn hot 2 min after start up exhaust getn red hot...stage 2 jet kit..vance&hines exhaust .no baffles 43000 miles


glowing exhausts indicate valve timing, ignition timing or lean fuel mixtures
AS you have altered the jets I would be looking at air/fuel mixture for the rear pot
It is probably the same for the front pot but with an air flow on the exhaust pipe you will not see it getting red

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Your induction blower motor makes vacuum as it blows out the exhaust. these code are saying that there is no vacuum..It is probably caused by your exhaust being blocked by something. Maybe snow or ice build up due to cold temp. Try a hair dryer to heat up exhaust pvc pipe melt ice in pipe. CAREFULL do not get it so hot it melts.

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What would cause the two exhaust manifold pipes on the passenger side to glow red hot the ones on the driver side does not get red hot 2000 Mitsubishi galant 2 4


Try checking for a restriction in the system. possibly the catalytic converter. are the pipes before the muffler? you can smack your catalytic converter with a dead blow hammer a few times before you start the engine. you will hear a sound similar to breaking glass from inside the converter it's carbon build up. Start the engine and rev it up a little. If it was constricted the carbon you broke loose will blow on out. If nothing is restricted in exhaust you may have a bad exhaust valve on that side.

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Have you done a compression check to see if you have a blown head gasket?

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Catalytic converter stopped up. Pipes got red hot. Replaced Cat. Conv. car runs good, then started random misfires, pipes got red hot again. What is exhaust part that is downstream of Cat. Conv. could it...


If the exhaust system was plugged the engine wont run, normally. It will start and idle until the back pressure is such that it can't take in more air/fuel mixture and then stall.

After the converter, there may be a resonator, and then the muffler. Is any exhaust flowing out of the tail pipe? You might try hooking up a scanner and see what your oxygen sensor(s) is/are doing.
Also, scan the MAF(mass air flow) sensor assembly.
Sound like the engine can't breathe, and its getting to much fuel.

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I have a 2004 Yamaha YZ450F the other day we started it up and ran it for about 30 min. and we noticed that the exhuast pipe was red hot and melting the plastic air filter case... Any thought as to why?...


Hello,

Actually your exhaust, at the head, will glow red when the bike warms up - this is normal. Melting the plastic air filter case, however, is not.

The bike is obviously running way too lean if you were riding it during the 30 minutes you mentioned in your question. If it was sitting for 30 minutes, without air circulating around the engine, your exhaust would become extremely hot possibly melting the Air Filter Case. Check to make sure you air filter is clean and your carb(s) is/are set correctly. You should have an Idle Speed adjustment knob also - check your user manual to see if there is an idle speed RPM setting and set yours to it.

Another issue that might cause your problem is the use of improper oil in the crankcase. Again, check your user manual for the correct oil type that should be used. Some oils have additives that are not good for motorcycles and can ruin wet clutches and other engine parts.

Hope this gives you enough information to go on.

If you find this post helpful, please vote. Thank You.

Regards,

Oz

Jan 10, 2011 | 2004 Yamaha YZ 450 F

1 Answer

Car starts but has no power and exhaust pipes get red hot


your converter is blocked needs to be changed,unless exhaust system is damaged and causing restrition.

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My son has a 2002 GS, and from time to time the check engine light comes on and the last time they fixed one of the catalytic converter sensors and all was well. Tonight the engine starting bumping like...


Sounds like there might be something inside of your exhaust creating pressure making your pipes hot. You might need a new Catalytic Converter. Dont wait too long to check this out, because if you do need a new Catalytic converter, your exhaust Manifold MAY Melt to your Head because of the heat.

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