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Old 11-30-2009, 08:18 PM   #3391
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Got any pics?
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Old 12-01-2009, 12:04 AM   #3392
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Quote:
Originally Posted by rranger View Post
How many you guys planning switch away from mtx4 to the new car that coming out recently?
is it true that mtx4 will come with new car....???

anyone can comfirm this...???
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Old 12-01-2009, 10:11 AM   #3393
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Originally Posted by shokyo View Post
is it true that mtx4 will come with new car....???

anyone can comfirm this...???
no official news, just speculation, probably a prototype for the few
mugen factory drivers in the coming worlds next year in houston!
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Old 12-01-2009, 11:23 AM   #3394
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Like I said in a previous post on this thread, this is the time period in which Mugen works on a new car. With the Sedan Worlds being held just down the street from me, they will probably have us some CAD drawning in a few weeks, a sneak peak photo from someone at a race in Asia or Europe after the first of 2010, and an official announcement on the release of the new sedan sometime in March with the first batch out in April/May, just in enough time for the Worlds. Just my insight.
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Old 12-02-2009, 01:54 AM   #3395
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I think the touring car design is quite mature these day and makers have to put alot more effort and time to refine the existing design for launching a new car. As you can see the the top cars in the market have quite similar concept, layout, transmission, suspension etc, even some parts of them you can swap to use, sure they have different, but to me are insignificant.

So I don't mind to wait a little longer until Mugen get some real good improvement for their next tourer.

After all, the Mtx4r still wins
http://www.redrc.net/2009/11/swauger...ai/#more-24668
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Old 12-04-2009, 06:49 PM   #3396
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Originally Posted by rmdhawaii View Post
My MTX-4 Web site has a section on stripping gears. Perhaps you might some helpful information there.

hi i cannot find your web site that talks about stripping 2nd gear can u help
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Old 12-05-2009, 05:08 AM   #3397
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That website disappeared long ago. Don't know what happened. I had 2 Mtx-4s. One first gen and one 4R. Both stripped gears bad out of the box and I tried everything that was on that website and everything said here and nothing fixed it. The ONLY thing that fixed it for me was the 4mm chassis. I had a 3racing 4mm that fixed it and also the Mugen 4mm fixed it. That was my personal experience though and as i'm sure you've read already, everyone seems to find their own way to fix it. Good luck.
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Old 12-07-2009, 03:59 AM   #3398
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From the NitroKB.com archives: Stripping 2nd Gear?

Below is some information and best practices to help identify, correct and potentially avoid a problem with stripping the 2nd spur gear.

Why the 2nd spur gear might strip:
  • Engine is not parallel to the 2-speed shaft, causing the gears to be meshed at an angle
  • Gear mesh gap is too loose (too much gap) or too tight (no gap)
  • Engine or engine mount shifts during an accident or because the engine screws get loose, causing improper gear mesh
  • 2-speed shifts too hard into 2nd gear, because there is too much of a gap between the 2-speed shoes and the 2-speed housing
  • 2-speed shaft is bent, causing the spur gears to wobble (inconsistent mesh)
  • Bearings are worn (bulkhead and/or clutch bell), causing the spur gears and/or clutch bell to wobble
  • Pinions or spur gear(s) are worn out, causing too much of a gap and/or improper meshing of the gears
  • Crankshaft has too much side-to-side play at the front bearing, causing the clutch to wobble
  • Car goes airborne and comes down while on-throttle, which may cause the chassis to flex enough to cause the gear mesh gap to be too loose or too tight (If the car goes airborne, get off the throttle!)
  • Collision while on-throttle, which may cause the chassis to flex enough to cause the gear mesh gap to be too loose or too tight.
  • Track debris gets caught in the gear mesh

Make sure the…

… engine mount(s) are perpendicular to chassis center line
… engine is parallel to the engine mount and 2-speed shaft
… carburetor is not touching the brake disc
… 2nd gear hub is not touching the clutch bell
… 2nd gear hub is not touching the side stiffener
… clutch bell and/or flywheel is not touching the chassis
… ends of the top and bottom engine mount screws are not touching each other
… side stiffener is attached before adjusting the gear mesh
… screws on the radio plate are not loose
… tuned pipe is not attached to the engine when you adjust the gear mesh
… engine doesn’t move when you apply the brake or throttle
… clutch endplay is not more than 0.3mm
… difference in tooth count between the spur gears and pinion gears is the same

Initial gear mesh adjustment:
  1. With the engine mount out of the car, mount the engine to the engine mount. Ensure that the engine is mounted straight onto the engine mount(s).
  2. Mount the engine with engine mount into the car, with the engine screws slightly loose. Be sure to put thread lock on the screws.
  3. Turn the engine so that the piston is in the middle position (not top dead center or bottom dead center)
  4. Remove the e-clip on the 2-speed shaft and remove the 1st spur gear
  5. Align two 2nd spur gear teeth with the one 2nd gear pinion tooth so that it fits perfectly together – then back off the pinion gear from the spur gear so that there is a very small gap. If you hold the pinion steady and rock the spur gear back and forth, you should notice a very small amount of gap between one spur gear tooth and the one pinion gear tooth.
  6. Tighten the bottom engine mount screws, ensuring that the engine mount is perpendicular to the chassis.
  7. Turn the spur gear and check the mesh at 90, 180 and 270 degrees from the current position. If the mesh is too tight in one particular spot, readjust the mesh for that spot and check all the positions again.
  8. Rotate the gears and make sure the gears are not binding. If they are, readjust the mesh.
  9. Put the 1st gear spur and e-clip back onto the 2-speed shaft. If the 1st gear spur is binding on the 1st gear pinion (the mesh is too tight), it means that something is not right.
  10. Inspect the gears from the top of the car and ensure that the pinion and spur gears adequately overlap each other when the clutch bell is pushed in and pulled out. If necessary, repeat the entire procedure ensuring enough overlap before tightening the bottom engine mount screws.
  11. With the wheels mounted on the car, push the car backward and forward and make sure the gears are not binding.

Checking the gear mesh:
  • Turn the engine so that the piston is in the middle position (not top dead center or bottom dead center)
  • Remove the e-clip on the 2-speed shaft and remove the 1st spur gear
  • Align two 2nd spur gear teeth with the one 2nd gear pinion tooth so that it is centered. If you hold the pinion steady and rock the spur gear back and forth, you should notice a very small amount of gap between one spur gear tooth and the one pinion gear tooth.
  • Turn the spur gear and check the mesh at 90, 180 and 270 degrees from the current position.
  • If everything is okay, put the 1st gear spur and e-clip back onto the 2-speed shaft. If not and nothing appears to wrong (see "Why the 2nd spur gear might strip" above), you have two options:
  1. Loosen the engine screws and remesh the gears. Check that the engine mount has not shifted (check the position of the screws) and the engine is parallel to the engine mount and the 2-speed shaft when tightening the screws.
  2. Remesh the gears using the bottom engine mount screws. Check that the engine has not shifted out of position on the engine mount. Be sure to reapply thread lock to the bottom engine mount screws.

Proper 2-speed clutch shoe adjustment:

Instructions for properly adjusting the 2-speed shoe prior to and after installation: (Attached)

Additional things to consider:
  • Purchase a one-piece engine mount. It makes it easier to ensure the engine mount is perpendicular to the chassis.
  • At a minimum, check the gear mesh before starting your race day and before running your Main.
  • If the 2-speed hub is touching the side stiffener or clutch bell, add a 0.1 - 0.2mm shim on the 2-speed shaft between the pin and the bulkhead bearing. Another option is to trim, sand or file the side stiffener where it is touching.
  • Change the rear bulkhead screws that fasten the bulkhead to the chassis from 3x8 to 3x10mm. This will help hold the bulkheads better.
  • As per the instructions, use lock washers on the top engine mount screws.

Note: The information above is based on a compilation of posts from the MTX-4 thread at RCTech.net and my experience with the MTX-4.
Attached Files
File Type: pdf mtx4_2speed_adjustment.pdf (142.2 KB, 293 views)
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Old 12-07-2009, 04:30 PM   #3399
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i have a nice mtx4r for sale here

http://www.rctech.net/forum/r-c-item...arter-box.html

pm me if you are interested
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Old 12-08-2009, 06:47 PM   #3400
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Can anyone advise how fix leaky diffs front and rear on this car. thanks.
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Old 12-08-2009, 07:51 PM   #3401
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try two gaskets instead of one
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Old 12-09-2009, 12:20 AM   #3402
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Quote:
Originally Posted by MTX4JR View Post
Can anyone advise how fix leaky diffs front and rear on this car. thanks.
Quote:
Originally Posted by Ashley Cobb View Post
try two gaskets instead of one
Don't use double gaskets, the internal gear mesh will be out.... far out.

The leaking actually come out from the tunnel where outdrive shafts are located. There is a lot of side play when you pull and push the outdrive cup.

To minimize oil leaking diff :

1. Install new o-ring, and put some thick lubricants on the tunnel holes.

2. Install 1 wider plate shim inside the gear box : 1 left side and 1 right side. You can find wider plate shims from 1/8 buggy / truggy cars. Try xray and hobao plate shims. .... measure the inside diameter of the plate shims = diameter of mugen outdrive shaft.

3. Add 2 - 3 more shims ( original 0.1mm mugen shims ) on inside. Put it after you installed the wider plate shim. These 0.1mm shims makes the gear mesh become closer. The internal gears will lock up or jammed, if you put too many 0.1 shims.

4. Add 3 - 5 more shims ( original 0.1mm mugen shims ) the outside. Place the shims between the diff housing and the outdrive cups.

5. Use 3x12mm screws to sandwich the diff unit.

6. Edit : If people insist to use double gasket, make sure to add more shims on the inside, and less shims on the outside.

hope this helps.
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Last edited by asw7576; 12-09-2009 at 01:01 AM.
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Old 12-09-2009, 12:33 AM   #3403
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oops!

Last edited by rmdhawaii; 12-09-2009 at 12:59 AM.
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Old 12-09-2009, 01:34 AM   #3404
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Mine leaked out the join where the gasket goes, not the outdrives.

2 gaskets fixed it for me
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Old 12-09-2009, 07:10 AM   #3405
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I do this for both my on-road and off-road cars.

If your diffs are leaking from the gasket try using a thin coat ( Paper thin coat on both sides of the gasket, make sure you cover all of the gasket ) of Permatex Ultra Blue 77B, do not over use. Make sure you use this type, the others do not work as well, this works the best.
I would not use two gaskets, this will change the gear mesh.
I have been doing this for over 7 years now and never had a leaky diff, the o-ring will start to le




Permatex® Ultra Blue® Multipurpose RTV Silicone Gasket Maker

OEM specified. Permatex® Ultra silicones were developed to meet today’s technology changes. Sensor-safe, low odor, noncorrosive. Outstanding oil resistance and joint movement values. Eight times more flexible than cork/composite gaskets; three times more oil resistant than conventional silicones. Temperature range -65ºF to 500ºF (-54°C to 260°C) intermittent; resists auto and shop fluids and vibration.


ak before the gasket will.Mugen MTX-4R-displayimage.jpg
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