yamaha big bear 400 running rich

Be careful so you don’t get any debris inside the cylinder. This fact prompted Yamaha to produce its first camouflaged ATV in 2000 with the Buckmaster Edition Big Bear. So determining the actual temperature solely by the color of the glowing is not very accurate.

Do not ride the bike until the sealant has healed completely. Si ce n'est pas le cas, n'hésitez pas à nous faire une demande de devis. Any ATV will generate a lot of heat when you push it to its limit. So let’s dive into the potential causes for your glowing exhaust. These things, however, are prone to fail because of corrosion or other various reasons. Before we get into the actual causes for why your exhaust may be glowing, you should know that some glowing is perfectly normal on many ATVs. If the bike has a spark arrester fitted it may have become dirty and needs a good cleaning so it won’t restrict airflow. The first part of the header, or up to the first bend of your bike’s exhaust, may start glowing if you push it hard enough.

Spécialiste pièces & accessoiresmoto, cross, scooter, quad. The Big Bear 250 is the 'little brother' of the Grizzly but it is ready to take you, and all your gear, into hard to reach areas. This is probably not the most common reason to why your exhaust is glowing, but if you are experiencing heat-issues it’s always a good thing to make sure the thermostat is functioning as it should. After reading countless forum posts, articles, and other sources on the topic, I dare claim that the bike running too lean is the most common reason for glowing ATV exhausts. I made this site to write about the things I have learned as an ATV owner.

The glowing exhaust disappeared immediately. Start by having a look into the end of the rear muffler. A properly functioning thermostat will open at a given temperature, allowing coolant to flow through the radiators in the cooling system. In this video we clean the carb on an ATV that has been sitting for years! En poursuivant votre navigation, vous acceptez l’utilisation de cookies pour nos statistiques et offres adaptées. The exhaust flow suffers badly from this, keeping the heat trapped inside the exhaust system. If the bike for some reason does not get as much gas as it needs, it will still run, but it will be running too lean. Ne manquez plus nos offres et nouveautés ! The exhaust valves inside your engine have the important job of closing when ignition happens, then to open to let the exhaust gasses out on the next stroke.

The same is true if the valve is (very) poorly adjusted, or even damaged, making it not close the exhaust port completely when it should. Use spray cleaner, a copper brush, and compressed air to make sure they are completely open. An even more accurate way is to perform a so-called leak-down test. it probably running too rich and fouling the plug. A temporary fix I’ve used with good results is putting some Tec7 Multibond in the crack until I could get a hold of a replacement. Production of the Big Bear 350 was halted in 1999 when Yamaha re-focused on other ATV models. Remove each jet to clean them individually. Notable features include rugged handling without compromise to load capacity and a class leading 264 lbs rack system. The Big Bear's engine was fed a by a single carburetor. Exhaust leaking before it exits the system will result in a lower back pressure, which in turn may cause the bike to run hot. Damaged vacuum lines will also make the bike running lean. To test if your valves are good, you can try performing a compression test. This one is almost a non-issue nowadays when we have fixed jettings. This shows how important the airflow is to keep the system cool.

(Or Slower?). I cannot tell you what is normal on all bikes, so if you want to be entirely sure everything is ok, your dealer should be able to tell you how your specific bike should behave. But then one day you notice a lager part of the pipe is affected, and the color has changed to bright orange, almost white color. The color should be grey to brownish with little zoot. Also, have a look at the intake boots and inspect for any cracks or loose clamps that could give you an air leak. This means something has changed, and it would be a good idea to locate what’s causing this change before it gets any worse.

This should ideally allow the quad to run fine all year round. A strong 230cc, 4-stroke, air-cooled single over-head cam engine and 5-speed transmission with reverse give the Big Bear a high performance rating. Instead it “hang” for a bit on higher RPM’s. On a friend of mines XP-1000, flow restriction had the unfortunate effect of setting the bike on fire! Using the wrong type of spark plug may have your engine running hotter than it’s supposed to. But back in the days when we had adjustable main jets, you could possibly mess up the adjustments so bad that unburned fuel was sent down into the muffler where it would continue to burn.

Prior to my purchase the previous owner, a friend, said he cleaned the carbs. I grew up on a farm where ATVs have been and still are an important part of “getting things done”. Ne manquez plus nos offres et nouveautés ! A more mechanical approach to telling if the bike is running too lean is by inspecting the spark plug(s). BIG BEAR 400 offroad vehicle pdf manual download. For comparison jump ahead to the Big Bear 250 review below. Keep going and look for the idle to begin to drop/miss again.

So if your exhaust is glowing red when standing still at idle, it may just be because of too little cooling. View and Download Yamaha BIG BEAR 400 owner's manual online. Yamaha Big Bear 250's had a suggested price of $4,099 in 2009. If you have any questions or suggestions regarding this article, please feel free to contact me. The idle should peak and become smooth. The Big Bear's engine was fed a by a single carburetor. I … How Long Do They Last? With fluids included and a full tank of fuel add another 30lbs to these weights.

There are several ways you can go about determining whether the bike is running too lean or not. As we’ve already looked at, a system made of stainless steel will glow at lower temperatures than non-stainless. Si ce n'est pas le cas, n'hésitez pas à nous faire une demande de devis.

Another way to tell if the bike is running too lean, just by riding it, is the idle hangs.

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