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Benjamin Cooper
Benjamin Cooper

Yfm (67) Mp4 !!TOP!!



The Yamaha Moto 4 marked the beginning of all-terrain vehicles. It had a 196cc engine, an electric starter, an automatic transmission, a reverse gear, and a snorkel air intake. It also minimized off-roading hazards and made rides more enjoyable with its four-wheel design.




Yfm (67) mp4



The introduction of the Yamaha Moto 4 in 1985 occurred when the ATC or three-wheel design dominated the all-terrain scene. Back then, ATCs or all-terrain cycles already had powerful engines but were not the safest or most stable to ride over uneven terrain.


The Yamaha Moto 4 350 or YFM350ER eventually became the prototype of various Yamaha models such as Warrior, Raptor Big Bear, and other YFM designations. Fitted with a bigger 329-cc engine, this sport ATV was designed for strong midrange pulling capabilities and serious mudding and riding in shallow water.


Powered by a four-stroke, air-cooled single-cylinder SOHC engine with a bore of 67 millimeters and a stroke of 55.7 millimeters. The engine is forward-inclined with a displacement of 196 cubic centimeters. A Mikuni carburetor handles the air-fuel mixture with a compression ratio of 8.5:1 and compression pressure of 883 kPa (9 kg/cm3, 128 psi). Fuel tank capacity is 2.5 US gallons/9.5 liters with a reserve amount of 0.5 US gallons/1.9 liters.


Power travels via a five-speed automatic constant mesh transmission inclusive of a reverse gear. It has a two-wheel drive with a maximum power output of 11.5kW (15.6PS) / 7,500r/min. The later versions from 225-cc to 350-cc come with manual transmission and 4WD options.


The Yamaha Moto 4 tires consist of Dunlop KT982 22 X 8-10 front tires and a Dunlop KT988 22 X 10-8 rear tires with tubeless panel wheels. Front wheels allow 2.6 inches of travel while rear wheels have 4.33 inches.


The MSRP of the 1985 Yamaha Moto 4 is quite obscure. But we can pinpoint the MSRP of the 1987 Yamaha Moto-4 YFM225T to be at $2,599. Nada Guides gives a price range between $265 to 1,275 for the 1985 Moto 4 YFM200N model in particular.


On the other hand, auction prices are between $199 and $2,237. Motos in poor condition or those auctioned for parts only sell within the price range of $199 to $550. Everything else above $550 would be in mid-fair to very good/excellent condition.


1986-1992 models are mostly in circulation in auctions and resale. Most of the ATVs found in these auctions have minor repairs needed for the sprayer tank, electric pump, and push-button start switch or battery replacement. But there are a few requiring complete tire and parts replacement and bodywork due to the four-wheeler being in poor condition.


Some of these ATVs sell cheap as they have sat for a while, with engines no longer starting or running. Some require little to no repairs but do not have titles. Others with titles or front and rear cargo and snowplow attachments are more expensive, even if they have an older model year.


Since most (if not all) Yamaha Moto 4 purchases are secondhand, expect alterations from minor repairs to full rebuilds. The condition and model year of your workhorse and whether the previous owner took care of it or not entirely dictates the extent of what needs to be changed or replaced in your quad. Below are some common things that need to be looked into when buying a used Moto 4:


Inspect all the nuts and bolts and see if anything is loose. Include the kingpins, wheel bearings, and rigs as faulty ones may cause your Yamaha Moto 4 parts to come loose, or your wheels to be wobbly and unstable. If everything is in perfect shape, make sure to label them carefully when you disassemble your four-wheeler when rebuilding or cleaning it.


As a new owner of a secondhand Moto, you can prep the plastic of your quad in numerous ways. If the exterior is already a bit worn out, you can spray paint the plastic to a hue and design that you like. But if the plastic is not that badly corroded, you can either put decal stickers on it or do the heat gun trick.


It is also worth inspecting other aspects of your four-wheeler like handlebars, electrical components, ATV seat, and lighting. But because it is quite an old model, some Yamaha Moto 4 ATV parts may be hard to come by. Luckily, there are a ton of online resellers and aftermarket dealers out there that provide your much-needed parts.


A few Yamaha Moto 4 250 parts are, likewise, compatible with the YFM200 version. I highly recommend that you do your research, too. Who knows? You might end up scoring cheaper but higher quality Moto 4 parts from less-known (even local) sources.


Putting your Yamaha Moto-4 vehicle in reverse requires a few easy steps. Initially, you have to shift into the first gear, grasp the H-L-R lever, push the button on the bottom in, and pull it back at once. Performing these simple steps put your Yamaha Moto-4 in reverse.


In other instances, you may need to make adjustments in the linkage of the shift lever to put your vehicle in reverse. Check that the parking brake is pushed far enough and is not jammed. Note that greasing in the shifter and brake is critical for the efficient functioning of your Moto-4.


Not only are these the best procedures to follow for preventing further wear and tear, but Moto 4 servicing when it comes to steering and breaking power transmission systems may also slightly differ from other vehicles. On top of what you already know, here are additional recommendations on how to care for this workhorse properly:


The VIN is a standard vehicle identification numbering system that helps identify the manufacturer, design, engine type, and the year of make. It consists of a 17-digit alphanumeric code unique to every vehicle. For easy decoding, you can feed the entire 17-digit code online on the Yamaha VIN decoder website.


All Moto-4 models have this code marked on the frame near the left footpeg when seated on the ATV. However, this specific location may change from year to year. Other areas where you can find the VIN are between the engine and the A-arm, on the neck of the frame close to the triple-tree, or slightly forward on the front-left footpeg. Cleaning the frame with a wire brush will help make the VIN more visible.


While there are approximately 19 different codes for ATVs Yamaha has produced to date, I will only list down the ones that start with a YFM code so you can make that distinction between a Moto 4 and other Yamaha ATV models:


Yamaha Motor Company Limited is a multi-national Japanese firm founded in Iwata, Shizuoka, Japan, in 1955. It has the second-largest motorcycle sales in the world and is the leader in water vehicle sales. Aside from successfully managing its global operations, it also participates in the development of tourist businesses, recreational and leisure facilities, and services.


Yamaha is world-renowned for its well-engineered cruiser and off-road motorcycles, multipurpose engines, intelligent machinery, snowmobiles, and other motorized products and is the maker of Yamaha Moto 4.


For the novice rider, this brute is a fantastic beginner quad. It is a perfect starting point for the experienced mechanic to build a buggy or practice on rebuilding. But for the company that manufactured it, the Yamaha Moto 4 is what has put them on the map of ATV history.


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Additionally, an attractive phenomenon is observed that the SMA helical microrobot moves in frequency-dependent modes before step out condition. To clarify these different modes, a model containing wobbling angle is demonstrated in Figure 3(c). Here, the wobbling angle β is defined as the angle between the helical axis and the translational motion direction. There exist three modes of motion determined by rotating magnetic field frequency (Figure 3(d) and Movie S2). At mode I, the axis of the helical microrobot keeps spinning for 360 in every rotation period, around translational motion direction at a wobbling angle. At mode II, the axis of helix tail keeps constant and coincident with translational motion direction. As for the mode III, the helical microrobot starts to keep a wobbling angle with translational motion direction but helix tail axis still performs no spinning.


Translational motion of SMA helical microrobot is converted by the rotation of the attached rigid chiral tail. A simple relation between its main structure parameters including pitch (λ), diameter (d), and helix angle (θ) (Figure 3(f)). Helix angle is written as


Secondly, puncture force is also taken into consideration. The high-speed rotating spiral microrobot performs similar with a microdriller, and the puncture force is a significant mechanical parameter. Johnson slender body theory is utilized to expose the impact of structure on the force (Figure 4(c)). The thrust force increases first and then decreases with rising helix angle and reaches a maximum at approximately 48. The force also increases as the microrobot rotates at a higher frequency. Besides, similar tendency can be observed from experiment focusing on a scaled-up microhelix (Figure 4(d); parameters can be found in Methods), which is shown in Figure 4(d). Given the above, the microhelix provides more puncture force when the helix angle reaches about 50 and microhelix with bigger helix angle is less likely to step out. Based on that, we can enhance the unclogging effect by shape shift real-time.


Apart from that, a significant variation in diameter occurs within manageable deformation range of the SMA helices (Figure 5(a)), based on which we developed a self-propelling stent towards plaque problem. The SMA helical microrobot propels at small helix diameter and transforms to large diameter responding to real-time heating, converting thermal energy into mechanical energy. Ultimately, the high energy density characteristic enables microrobot to expand and open up the plaques in blood vessel wall (Figure 5(b)). The self-propelling stent can be manufactured in various sizes to be placed in the vasculature and airways. Moreover, they can be coated with diverse drug particles to enable the local delivery of therapeutics through circumferential injections. 041b061a72


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