How big is the fuel tank on a Big Bear 400?
The Yamaha Big Bear 400 4×4 has an engine displacement of 386 cubic centimeters, a compression ratio of 8.6:1, and a wet sump lubrication system. A 33-mm Mikuni BSR carburetor handles the air-fuel mixture. Fuel tank capacity is 3.96 US gallons/15 liters, with 1.06 US gallons/4 liters reserve.
Why does my Yamaha Big Bear not start?
If you have a hot spark (bright blue, because a poor spark can cause a fouled blackened plug), you likely have a carburetor leaking past the float valve. It’s a simple fix and I would replace the float and float valve as well.
What are the specs of a Yamaha Big Bear 400?
2000 Yamaha Big Bear 400 Specs (YFM400FNM) Engine – It is powered by a four-stroke, air-cooled, single-cylinder SOHC engine. The forward-inclined power mill has a bore-stroke ratio of 83 × 71.5 millimeters (3.27 × 2.82 inches).
What should the tire pressure be on a Big Bear 400?
Tires – Dunlop KT404 AT25 X 8-12 front tires and Dunlop KT4058 AT25 X 10-12 rear tires mount on tubeless steel wheels. The recommended tire pressure is 3.6 psi/25 kPa (0.25 kgf/cm²). Do not go beyond tire pressure limits of 3.2 psi/22kPa (0.22 kgf/cm²) and 36 psi/250 kPa (2.5 kgf/cm²).
How does the carburetor on a Big Bear work?
The Big Bear’s engine was fed a by a single carburetor. The carburetor could be adjusted to alter the engine’s idle speed as well as the amount of air mixed into the carburetor’s pilot fuel system, which fed the engine from idle to a quarter-throttle.
When did the Yamaha Big Bear ATV come out?
The Yamaha Big Bear debuted in 1996 as a 400 cc utility-type all-terrain vehicle that quickly became popular among game hunters. This fact prompted Yamaha to produce its first camouflaged ATV in 2000 with the Buckmaster Edition Big Bear. The Big Bear’s engine was fed a by a single carburetor.
What should idle speed be on Yamaha Big Bear?
Turn on the inductive tachometer. Ideally, the tachometer should indicate an engine idle speed between 1,450 and 1,550 rpm. Look for the black idle adjustment knob attached to a cable on the left side of the carburetor.
Why is there no fuel going to the carburetor?
A hole in the fuel line on the tank side could also cause the fuel pump to suck air instead of fuel from the fuel tank. There may not even be signs of leaking, since a fuel line leak on the tank side would have to be above the fuel level for leakage to show. Remove and check all fuel filters located in the fuel line and in the carburetor.
When did the Yamaha Big Bear 400 come out?
This read will enlighten you on why the Big Bear is so well-loved by consumers, as you learn about its specs and features, highs and lows, and more. The Yamaha Big Bear 400 is the 17th model released by Yamaha since its 1980 Tri-Moto launched in the U.S.
What does it mean when your ATV exhaust is red?
Picture this: You just got back home from an intense ATV trail-run when you notice that the exhaust is glowing red hot. You naturally start worrying whether this is normal or not. A glowing red color is usually an indicator of fire-bursting temperatures, which is rarely a good sign, especially when it involves our expensive toys!
What kind of shocks does a Big Bear 400 have?
The 2004 Yamaha Big Bear 400 had high-quality Showa spring/shocks front and rear. For all models, the vehicle’s IRS provides maximum ground clearance and excellent maneuverability on diverse terrain.
Picture this: You just got back home from an intense ATV trail-run when you notice that the exhaust is glowing red hot. You naturally start worrying whether this is normal or not. A glowing red color is usually an indicator of fire-bursting temperatures, which is rarely a good sign, especially when it involves our expensive toys!
What does it mean when your bike exhaust glows?
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. This does, however, not necessarily indicate something is wrong with the bike. It will not hurt anything. But if the exhaust glow beyond the first bend, you probably have a problem that needs to be addressed.
What causes the exhaust on an ATV to run hot?
An even more accurate way is to perform a so-called leak-down test. Exhaust leaking before it exits the system will result in a lower back pressure, which may cause the bike to run hot. Look for loose clamps]
Why does my bike exhaust turn red when idle?
Even if the bike produce more heat when riding, you may even find that the glowing gets worse when standing still at idle. This shows how important the airflow is to keep the system cool. So if your exhaust is glowing red when standing still at idle, it may just be because of too little cooling.