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My trx 450er run s good but the pipes glow red hot whats wrong

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The fuel mix is too lean. Chances are the rubber seals from the carb to the cylinder need to be replaced to prevent un-carbureted air from getting into the fuel/air mix.

Posted on Sep 11, 2010

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My 2005 450 RMZ exhaust pipe glows red at idle. What size jets do I need at 1000' elevation?


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Hi, Anonymous a YZ is a motocross bike designed to run flat out that being said if you are strolling down some scenic trail at a slow pace or letting the bike idle for a few minutes your header pipe will turn cherry red, why you ask? It is not a street bike, it is designed for competition and weight is a major factor all necessary components are of the smallest and lightest design necessary to maintain performance under extreme conditions ie. small radiator and inside frame oil reservoir that doesn't get cooled, the majority of your riding needs to be at high speed. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Fueling issue running far to lean, choke makes the circuit richer so it will run , lean running causes over heating and serious engine damage if its running red hot, check the plug for white burnt or blistering will show lean running. Compression test to make sure the piston ring and barrel are not damaged over 110psi. Is the exhaust blocked restricted or dented ?

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2005 ultra classic completely stock. the motor seems to be running fine but it feels like its running very Hot after only a short time. last night i noticed that the "Y" pipe from the rear...


The late model engines do run hot. This is because they are set to burn a very lean mixture. Personally, I'd take the bike to a shop that has a dyno and an Exhaust Gas Analyzer. Have them run the bike up and give you their opinion of the what it needs. Also, here's a site that has something about how hot the bikes run these days. http://www.nightrider.com/

Good Luck
Steve

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1 Answer

I recently bought a honda trx 350 fm quad when i start it it only runs on the choke , then the exhuast pipe after a while heats up (glowing ) any ideas pete.


The pipe glows because of the extra fuel from the choke. (four strokes do this) Look closer into the carburator for a blocked passage, or junk in a jet. Clean it out thoroughly!!!

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the pilot jet is too only make the bike idle so it wouldnt be this is the engine have lots of oil in the engine

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The header pipe will glow red when you run it on choke, during warm up. This is normal while sitting. You shouldn't see that one you start riding it though.
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