2009 Yamaha Big Bear 400 IRS 4x4 Review

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2009 Yamaha Big Bear 400 IRS 4x4 Review
This Bear likes to play in the mud
Story by Rick Sosebee, Photography by Rick Sosebee and Yamaha, Feb. 11, 2009Email a friend

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Finding a demographic for an ATV is just the first step to having great success for a manufacturer. Yamaha decided to look at the southeastern United States to find the perfect suitor for its Big Bear 400.
In 2007 the Big Bear 400 was introduced as a solid machine for working class users, but it has advantages for more adventurous riders as well. Digging into the southern states Yamaha revealed some startling numbers about its potential buyers. The United States has several unique areas that make up the vast majority of this Big Bear’s market. The 5-speed air-cooled 4x4 ATV makes up 25 percent of the total sales of 4x4 ATVs with 50% of those sales in states along the southeastern U.S. This is where swamps and low-lying creek flooded farmland will make the Big Bear shine. Yamaha’s Newnan, Ga. facility is in the heart of this prime workhorse ATV’s element. With all of the numbers in mind let’s look at what makes the Big Bear 400 a success.

  


The 386cc motor is air cooled for a few reasons. If you were to take a liquid cooled engine into deep mud and muck, the radiator can become clogged and cause overheating. If the radiator becomes clogged it will cause high temperature issues that can finish off the average ATV. This is why Yamaha decided to go with an air-cooled. Though there is the oil cooler to deal with on an air cooled engine, it has been relocated to get it up behind the protection of the front fenders in the nose of the Big Bear. The oil cooler’s capacity has also been increased by 30 percent which not only provides the reserve oil needed to keep the motor running clean but it also makes for lower engine temperatures and better performance. Everything vital to the quad is protected.


The engine of the Big Bear 400 draws air through a 33mm Mikuni carburetor. Having an EFI or electronic fuel injection throttle body would have been easy, but to keep with the plan of the simple serviceable unit Yamaha opted for the traditional carburetor. This allows the rider to maintain things himself, even on the trail. If you get water in your fuel, and sometimes it happens, you just drain the carb bowl with a simple turn of the screw on the bottom of the carb and get back to riding. Remember this - the Big Bear is simple and we found that out with every feature.

The Big Bear’s 386cc engine is fired by a standard DC-CDI ignition system. The 8.6:1 compression should allow for easy starts and smoother running. Not to mention it adds reliability to the life of the Big Bear.

The electrical components on the Big Bear have been upgraded to Marine-style connectors. These plugs and wiring systems can be submerged in water and still remain dry where it counts. This is a feature that all utility ATVs should be built with from the factory. If it’s built to get wet and dirty then it has to be safe and that’s where Yamahas engineers didn’t pass the buck.

The electric start, which is just a touch of the button located on the left handlebar mounted control center, will fire the Yamaha Big Bear to life. But let’s say you happen to drain the battery and need an alternate. Then you can pull till your heart’s content on the rope style pull start located on the lower left side of the engine just about at your ankle. I prefer the electric start myself, but just for the experience we had to try the pull start just once. It was an easy pull and it fired right up the first time. That’s a great feature and it should make hunters happy all over the Southeast. It does get cold down in the south and although the maker of the battery wants it to perform in any condition it will run down or just be plain lazy sometimes in colder weather.

Once the engine is fired up you have five gears and a reverse. The transmission has an automatic clutch, which allows you to stay focused on the trail and hold onto the Big Bear. This not only eliminates costly maintenance of the clutch system, which in the mud can be a regular task, it also makes the operation just a bit easier.




Yamaha included engine braking on the Big Bear, which is a feature other manufacturers charge extra for. Yamaha provides this feature for your safety. Other braking options include dual hydraulic disc brakes in the front, while and on the rear you have a new feature in the sealed oil bathed five-disc braking system.

Yamaha has put its ‘On-Command’ push button three-way locking differential on the right side of the bars. The button is unique in that it has a few different operations. Pressing the 4x4 button in allows a limited slip feature. This seems to be all the Yamaha Big Bear needs in the deep stuff, but there is fully locked differential selection as well. This feature makes the Big Bear unstoppable in most any condition. All of the Big Bear’s power is transferred to the wheels by drive shafts and they all have protective boots to keep the trash out.

  
  

Keeping you stable and comfortable on the trails is independent double wishbone front and rear suspension. This Bear has 10.5 inches of maximized ground clearance, so deep ruts pose no threat. The shocks that suspend this Bear are five-way preload adjustable and can also be adjusted on the trail for the discriminating rider. The Big Bear seemed easy to handle and there is little feedback in the steering when encountering roots and rougher terrain.

Front tires on the Big Bear measure 25x8-12 and the rears are 25x10-12. This helps with the ground clearance as well. It seems that Yamaha wants to give you everything you need and make sure that when you leave the dealer floor you are ready for anything. ITP developed the MudLite for the trail user who likes getting into mud and creeks without getting stuck. They also made the MudLite to be gentle on your body over rough terrain at low speeds by softening out the side-wall of the tires. The end result is a tire that’s comfortable for any rider and can get over most any obstacle.

The Big Bear 400 has many features from the simple speedo to the intergrated floor boards to keep the mud off of your boots. Of course this only works if you don’t get into the deep stuff. The colors for the 2009 Big Bear are Hunter Green, Steele Blue and Black Mettallic. There is also a Realtree AP HD Camouflage version for the hunter in your life. Dual 30watt Krypton Multi-reflector headlights also come standard for those trips to the deer stand. The improvements over earlier models are totally noticeable and will make the Big Bear a stand out competitor in the woods and mud.

Ride Impressions

Our ride time was a blast on the Big Bear 400. The simplicity of operation took all of the worry out of the picture. The machine truly allows you to enjoy the ride and be in control of the machine. A steering damper would help helpful to take the twitch out, but it wasn’t an overwhelming issue on our ride. Getting down into the deep stuff we found that the Big Bear really is a torque monster. First gear had probably the lowest ratio I had seen in my days of riding. This could be problematic at times and I felt second gear was a better starting place in most situations. Firing up the 386cc engine was never a problem and from a mechanic’s point of view the starting system looks really easy to maintain.




One thing that stuck out in my mind was the sealed rear disc braking system that Yamaha has designed for the Big Bear. The braking components are sealed in an impermeable case with the rear tranny gears. This was most evident when I would go through deep mud and then try to stop the Big Bear. I never had trouble like I remember having with the open air style braking systems. Yamaha even claims with regular servicing of the gear fluid the brakes should last the life of the ATV.

Overall the redesigned Yamaha Big Bear that was introduced in 2007 is a great machine and definitely a purpose built machine. It rides comfortably and will have a place in every garage for years to come.

2009 Yamaha Big Bear 400 IRS 4x4 Specs
Engine Type: 4-Stroke Single, Air/Oil Cooler w/ Fan, SOHC
Bore x Stroke: 83mm x 71.5mm
Compression Ratio: 8.6:1
Carburation: Mikuni 33mm BSR
Ignition: DC – CDI
Starting System: Electric w/ Auxiliary Pull
Transmission: 5-Speed Automatic Clutch w/ Reverse
Drive Train: Yamaha On-Command push button 3-way locking differential, 2WD, 4WD, locked 4WD; Shaft
Front Suspension: Independent Double Wishbone, 5.8” w/ 5-way Preload Adjustment.
Rear Suspension: Independent Double Wishbone, 7.6” w/ 5-way Preload Adjustment
Front Brakes: Dual Hydraulic Disc
Rear Brake: Fully Sealed, Oil Bath, Multi Disc
Front Tires: ITP Mud Lite 25x8-12
Rear Tires: ITP Mud Lite 25x10-12
Length/Width/Height: 79.4” x 43.9” x 46.7”
Seat Height: 35.2 in
Wheelbase: 48.4 in
Turing Radius: 126 in
Ground Clearance: 10.5 in
Fuel Capacity: 4.0 gal
Dry Weight: 593 lb
Rack Capacity: 88 lb Front / 176 lb Rear
Towing Capacity: 904 lb
Instrumentation: Speedometer / Odometer & Fuel Gauge
Lighting: Dual 30W Krypton Multi-reflector Headlights & 21/5W Brake light
MSRP: $5,799 ($6,149 for RealTree AP HD Camo)

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2009年雅马哈大熊400国税局四驱车审查
这熊喜欢在泥浆
故事由里克Sosebee ，摄影由里克Sosebee和雅马哈， 2月11日， 2009Email朋友

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找到一个人口为亚视只是第一步具有巨大的成功的制造商。雅马哈决定看看美国东南部找到完美的求婚的大熊400 。
在2007年的大熊400介绍了坚实机工人阶级用户，但它的优势更为冒险的骑手以及。钻研南部各州雅马哈一些惊人的数字显示其潜在的买家。美国有几个独特的领域，使绝大多数的大熊的市场。 5高速风冷四驱车亚视弥补百分之二十五的总销售四轮驱动ATVs 50 ％的人在美国的销售沿东南美国在这方面，沼泽和低洼溪受淹农田将使大熊服务。雅马哈纽南，美国乔治亚州工厂的心脏，这个总理驮马亚视的元素。与所有的号码记住让我们来看看什么使大熊400是成功的。

   


在386cc电机气冷几个原因。如果你是采取水冷发动机进入深泥浆和淤泥，散热器可以成为堵塞，导致经济过热。如果散热器成为堵塞会造成高温的问题，能完成从平均亚视。这就是为什么雅马哈决定选择一个空气冷却。虽然有油冷却器处理的风冷发动机，它已迁往得到后面的保护，前挡泥板的鼻子的大熊。的油冷却器的能力也增加了百分之三十，不仅提供了所需的石油储备保持清洁汽车运行，但它也为降低发动机的温度和更好的性能。一切都至关重要，四是保护。


引擎的大熊400空气通过三三毫米三国化油器。在电喷或电喷油门机构都容易，但保持与计划雅马哈简单使用的单位选择了传统的化油器。这使得车手保持自己的事情，即使是开拓者。如果您在您的水燃料，有时它发生了，你只需消耗碳水化合物碗用一个简单之交的螺丝底部的碳水化合物和回到骑马。记住这一点-在大熊很简单，我们发现，每一个功能。

在大熊的386cc引擎是发射一个标准的DC - CDI点火系统。在8.6:1的压缩应允许容易启动和顺畅运行。更不用提它增加了可靠性，生活的大熊。

在电子部件上的大熊已经升级到海洋风格的连接器。这些插头和布线系统可以浸没在水中，仍然保持干燥的地方罪状。这是一个实用的功能，所有ATVs应建立与从工厂。如果它的内置让湿和脏那么它必须是安全的，在那里Yamahas工程师没有推卸责任。

电动开始，这仅仅是一个触摸的按钮，位于左侧的把手安装控制中心，将火灾雅马哈大熊生命。但是，比方说，您正好消耗电池和需要候补。然后你可以到你的心拉的内容风格上的绳子拉启动位于左下方引擎只是在你的脚踝。我喜欢我的电启动，但仅仅是为了体验，我们不得不尝试拉开始一次。这是一个容易拉和发射权的第一次。这是一个伟大的功能，它应使猎人高兴整个东南亚。它获得了在寒冷的南部，尽管制造商的电池希望它来执行在任何情况下，将缩减或仅仅是平原懒惰有时8.318 。

一旦发动机发射了您有五个齿轮和扭转。传输具有自动离合器，你可以继续关注跟踪和守住了大熊。这不仅消除了昂贵的维护离合器系统，该系统在泥泞中可以经常的任务，这也使得行动只是一个稍微轻松一点儿。




包括雅马哈发动机制动的大熊，这是一个功能其他制造商收取额外费用。雅马哈提供此功能为您的安全。其他选项包括双制动液压盘式制动器在前面，而和后方你有一个新功能，密封油沐浴五盘形制动系统。

雅马哈已将'论- command '的按钮三路锁定差动右侧的酒吧。按钮的独特性在于，它有几个不同的业务。紧迫的4x4的按钮，可以让有限的防滑功能。这似乎是所有雅马哈大熊需要深的东西，但有充分锁定差动选择以及。此功能使大熊中最不可阻挡任何条件。所有大熊的权力移交给车轮的传动轴，它们都具有保护靴子保持垃圾桶了。

   
   

让您稳定和舒适的步道是独立双叉前后避震。这熊10.5英寸的最大离地间隙，如此之深ruts构成任何威胁。的冲击，暂停本熊五个双向预调节，也可以进行调整，对开拓者的歧视骑手。在大熊似乎很容易处理而且没有反馈指导当遇到根和粗糙的地形。

前轮胎的大熊衡量25x8 - 12 ，后胎是25x10 - 12 。这将有助于与地面清除以及。看来，雅马哈想给你你需要的一切，并确保当您离开经销商请您准备好一切准备。血小板减少性紫癜的MudLite发达国家的开拓者用户谁喜欢进入泥浆和小溪没有得到坚持。他们还提出MudLite是温和的对你的身体在恶劣的地形上低速行驶的软化了侧壁的轮胎。最终的结果是轮胎的舒适的任何车手和最能超过任何障碍。

大熊400的许多功能已经从简单的速比的综合地板保持泥浆从您的靴子。当然，这只是工程如果您没有进入深层的东西。颜色为2009年大熊是猎人绿色，蓝色和黑色斯蒂尔Mettallic 。还有一个Realtree伪装美联社高清版的猎人在你的生活。双三十零瓦特氪多反射灯的标准也为那些前往鹿立场。早先的改进模型是完全明显，并将大熊一个独立的竞争者在树林和泥土。

换乘次数

我们乘坐的时间是爆炸的大熊400 。在简单的操作了所有的担心出图片。机器真正让您享受乘坐并控制了机器。一个指导阻尼器，将有助于帮助采取收缩，但是这不是一个问题，我们的绝大多数乘坐。入门下到深的东西，我们发现，大熊真是扭矩怪物。第一档有可能的最低比例我已经看到我在天的好去处。这可能是有问题的时候，我觉得第二个齿轮是一个更好的起点在大多数情况下。射击的386cc引擎，从来就不是问题，并从力学的角度出发系统看起来非常便于维护。




有一件事情伸出在我看来是密封的后轮制动系统，光盘雅马哈设计的大熊。制动元件被密封在一个不透水的情况后tranny齿轮。这是最明显的时候我会去通过深泥，然后尝试停止大熊。我从来没有遇到了麻烦，我记得有与露天式制动系统。雅马哈甚至索赔，定期服务的齿轮刹车液应最后的生命亚视。

总体而言，重新设计的雅马哈大熊介绍说，在2007年是一个伟大的机器，肯定是一个专门建造的机器。它乘坐舒适，将有一个发生在每一个车库多年。

2009年雅马哈大熊400国税局4 × 4规格
发动机类型：四冲程单，空气/油冷却器瓦特/范， SOHC
缸径x冲程：八三毫米x七十一点五毫米
压缩比： 8.6:1
Carburation ：三国三十三毫米特别调查队
点火：直流-点火
起动系统：电力瓦特/辅助拉
变速器： 5速自动离合器瓦特/反向
传动系统：雅马哈在指挥按钮3单向锁差速器， 2WD ，四轮驱动，四轮驱动锁定;轴
前悬挂：独立双横臂， 5.8 “宽/ 5双向预紧调整。
后悬挂：独立双横臂， 7.6 “宽/ 5双向预紧调整
前面有刹车：双液压盘式
后制动：全密封，油浴，多功能光盘
前轮胎： ITP的泥建兴25x8 - 12
后轮：血小板减少性紫癜泥建兴25x10 - 12
长/宽/高： 79.4 “ × 43.9 ” × 46.7 “
座位高度： 35.2在
轴距： 48.4
图灵半径： 126
离地间隙： 5月10日在
燃料容量： 4.0加仑
干重：五百九十三磅
承载能力：八八英镑接待/一百七十六英镑背
牵引能力：九〇四磅
仪器仪表：车速/里程表和燃油计
照明：双30W氪多反射头灯及21/5W刹车灯

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[ 本帖最后由 jjj1269 于 23-3-2009 12:50 编辑 ]