Question about 2001 Yamaha YZ 426 F
Posted by Anonymous on
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.
02 YZ426F Header Pipe Glows Red 4Strokes com
2002 Yz426f Header Pipe Turns Red YZ 400 426 450
Yamaha YZ426F Owner Service Manual
OEM parts for Yamaha
Yamaha YZ450F Owner Manual Page 3
Posted on Aug 04, 2016
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Posted on Jan 02, 2017
They will all glow red when you let them idle for a couple minutes. The timing is retarded at idle I believe. Once reved up they will cool off. I figure best to give them a little rev once and a while to help prevent this.
Posted on Mar 19, 2009
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
Posted on Oct 01, 2009
Testimonial: "I haven't thought of that but I will put a little more oil in it and try it again. Will let you know the results later. Thanks"
Do a compression check on all cylinders. This may need rings or has a sticky intake valve
Posted on Oct 15, 2009
Testimonial: "thanks mathewsdl on the fzr 1000 very helpful"
I would check your coolant first off. Your bike also may be running a little rich (too much fuel) which can cause greater heat. I would try adjusting the little black knob that sticks out of your carburetor, this will adjust your air-fuel mixture. Be careful though, adjusting too much at one time and then riding it hard could damage your bike, i'd adjust it little by little and then ride a bit after each adjustment. See if that helps you work out this problem. good luck
Posted on Nov 20, 2009
Any reason you had to change the jetting??New pipe,Intakes.?But,even though you may have it a bit rich on idle the pipes WILL get very hot,very quickly without some sort of air flow over the front of the motor and radiator.At the very least,have a strong fan blowing directly on the front of the motor if you are going to let the bike run and you are not riding it.I have seen the white plastics in front of the radiator distort from the radiant heat.Don't idle them for in more then 20 seconds.It can do heaps of damage.Ride the bike and see if its running well.When you stop,turn it off.All the yz and wrf will get very hot at idle.Hope this helps
Posted on Jan 17, 2010
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