RCScrapyard ► Radio Controlled (RC) Models, Parts and Spares ► Yokomo MX-4. For Sale in The USA.

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1/10 Scale Electric Buggy:

Yokomo MX-4


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How To Set-up, Hints and Tips for the Yokomo MX-4:

  If you are looking to win races with your Yokomo MX-4, It calls for fine tuning to attain better steering response and improve grip when cornering so you don't slide off the side of the track. Minute changes can make huge advancements. Our easy to understand list will show you how, and lead you to the optimum Set-up to put you in front of the rest on the track.
  We give you all the basic information you need to guide you to the best Electric Motor for your MX-4, and achieve the best Gearing, to get you in front on the track and keep you there.
  Find out how the worlds top professional RC racers get improved efficiency from their Bearings employing a number of sensible ideas. Find the way to avoid Radio interference, and basic instruction on how to Charge your Batteries So they will last longer and provide improved power.


★ Yokomo MX-4 ★
Yokomo MX4 - 1:10 Electric Buggy






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Yokomo MX-4: For Sale in the USA

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★ Yokomo MX-4: ★


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Buying a Used Yokomo MX-4 Buggy.


   Buying a used Yokomo MX-4 Electric Buggy, or any used RC Model, has a number of advantages. It is generally cheaper than new, ready built and may come with a variety of expensive hop-ups already installed. Cheap, pre-loved bargains are always becoming available. However, depending on the age of your purchase, it may need a little tender loving care before you can take it out on the back yard.

   The one thing you will always need is an instruction manual. If not supplied with your purchase they can often be downloaded from the Yokomo website, or purchased separately on eBay. With an instruction manual, any problems with your model Buggy you may discover can easily be fixed.

   When you receive your used Yokomo Buggy, make a general visual inspection of the chassis, front and rear wishbones, suspension shock towers etc, for anything broken that may need to be replaced. Then, take a screwdriver and box spanner and check each self tapping screw and nut for security, taking care not to over tighten. Next, for those Yokomo models with oil filled shock absorbers, remove them from the chassis and dismantle the coil springs. The damper shafts should push in and pull out with a smooth action. If you feel a jolt as you change direction, this means the oil has leaked out and must be topped up. At the same time, change the O-Ring seals to prevent more leakage. Also check the damper shafts for damage. If they are scratched, change them as soon as possible.

   If the body shell of your Yokomo MX-4 is broken, ripped or damaged in any way, this can be easily repaired with rubber solution glue. Also, for added protection and if available for your MX-4 model, fit an under guard to stop dirt and gravel entering the chassis.

   Examine the drive shafts for wear and replaced as required. If possible, change them for titanium. The steel shafts wear and bend too easily.

   If you intend to race your MX-4 Buggy model at a competitive level, I would also recommend you obtain and fit titanium pivot shafts, turnbuckles, tie rods and steering rods.

   The gearbox of your used Buggy should be opened up to check for gear wear and lubrication. A thin coat of grease is often used on internal gears and although this is fine for basic running around on the back yard, if you intend to race your Buggy at a higher level, this should be removed and replaced with racing oil (ZX1 or Teflon Oil). Of course, this should be reapplied after each race meeting.

   Gears are a weakness on all Buggy RC models. Head on collisions can easily damage the gear teeth on nylon and plastic spur gears. Heavy impacts can also loosen the nuts or self tapping screws that hold the Electric Motor in Position, allowing the pinion gear to pull out of mesh slightly and rip the tops off the teeth on your spur gear. To minimise this possibility, fit bolts with locking nuts to the Electric Motor mount and remember to check them for security after every two or three runs.

   Ball joints always cause problems. For top level Electric Buggy racing, the plastic ball connectors should be checked and if deemed necessary changed after every meeting. A simple thing like a loose fitting connector popping off could easily end your race, so better safe than sorry.

   The MX-4 steering servo is also prone to damage. In high speed crash situations, the fragile gear teeth of the servo can be broken off, rendering your expensive servo useless, so be sure to obtain a good quality "Servo Saver". Check out my Servo Information article.

   If body roll on your Yokomo MX-4 is a problem, handling can be improved with the use of stabilizers, anti roll or sway bars, stiffer tuning springs and, or, thicker silicone oil in the dampers.

   If your used Yokomo Buggy comes with plastic and sintered brass ring type bearings, check the shafts that run in them for wear. Dust and grit can get into these bearings and abrade the shafts. Therefore, you should replace them all with shielded ball bearings. If the model has been run with ring type bearings, you may have to change all the axles and driveshafts. For more information, take a look at my article, How to get the best from your Bearings.

   Finally, good luck with your MX-4 model and good racing.


For More on how to Setup your Buggy, check out my Hints and Tips page.


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Hints and Tips

Toe Angle

   When you first build your RC model car, you will no doubt have made all the settings advised in the manufacturers' manual and will take it out on the back yard not thinking of things like camber, caster or toe-in I know I did. It's only when you get competitive that you start learning about these things and just what a big difference they can make to the handling of your car. One of the more effective of these adjustments is Toe-in.

   The term, toe-in, toe-out, or toe-angle, refers to the alignment of the front or rear wheels, when viewed from above and is easily adjusted via the track rods or turnbuckles that link to the steering mechanism or directly to the steering servo horn.

   Front toe-in reduces steering when entering a corner, but improves steering response on corner exit under acceleration. On the straights, toe-in will also improve the cars stability while accelerating.

   Front toe-out will improve steering on corner entry, but makes the car unstable under acceleration on the straights and on bumpy tracks. The usual recommendation is to have up to 1 degree of either toe-in or toe out.

   Rear toe-in is generally found as the standard setting on most on-road and off-road RC models.

   More rear toe-in provides the car with more power under-steer, as well as improved stability and rear end traction. This setting is recommended for low grip tracks.

   Less rear toe-in slightly reduces steering on corner entry, but improved steering under acceleration.

   To measure toe-angle, I used to use my trusty vernier callipers to measure the width at the front of the wheels and the rear of the wheels and using this information along with the diameter of the wheels simply calculate the angle. Or, you could alternatively use this data to draw a triangle on a sheet of paper and measure the angle with your trusty school protractor.

For More Setup Information check out my Hints and Tips page.







Hints and Tips


Bearings

   If you are serious about your racing, looking after your bearings is essential if you are to remain competitive.
   My own experience is in both Off and On Road, National and International Car racing, but most of these tips could be useful to all forms of RC.

   Shields: The main problem with Ball Bearing Shields is they create friction, and obviously the more you can reduce friction, the more efficient your bearings will be, so here's a tip that does just that.
   Wheel Bearings always come in pairs, positioned side by side. If you think about it, the two inside shields on each bearing are not required, so ... you can remove them using a small jewelers screwdriver ... simple. And in one fell swoop you have halved your wheel bearing friction.

   Cleaning: All Bearings need to be cleaned from time to time. Depending on how focused and competitive you are, this can be as often as after each race meeting, or just once or twice a year ... For Club Meetings once or twice a year might be all you need if you are easily beating your competition, but for the BIG meets you need that extra 5% or 10% just to be up with the rest.
What you need is a small glass jar, a jewelers screwdriver, an old tooth brush and some Isopropanol.
Remove the shields, then drop the bearings in the jar, add some Isopropanol, pop on the lid and shake well. Empty them out, give them a good brushing and make sure they spin free then repeat the process. Clean the shields separately. Once you are satisfied, lay them on a piece of kitchen roll and allow to dry.

   Lubrication: The arguments I have had about what lubrication to use you wouldn't believe. Some of the top racers of my day swore they didn't use any at all, but cleaned out the original lubrication and ran them dry ... they also admitted to fitting a new set after each meeting ... well, they were getting them for free.
My tip is, yes even with a new set of bearings, clean out the original lubrication (as described above) and with one shield in place use the thinnest oil you can find ... I recommend ZX1 (Zed Ex One) or sewing machine oil.

For More Setup Information check out my Hints and Tips page.








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