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Old 04-20-2011, 06:13 PM   #31
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Originally Posted by dreaux View Post
You HAVE to HOLD the pinion and universal cup TOGETHER while you tighten the grub screw, or this is what happens!
+1. I learned this the hard way as well.
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Old 04-21-2011, 02:28 AM   #32
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Originally Posted by stuntryda View Post
wow thats pretty bad! my diff case doesnt have any marks in it like that just no teeth on half the ring gear and little nubs on the pinions, both front and rear! they are being sent in to mugen later on this week i ordered new front and rear diffs and pinions ( although i dont think i should have too ) an MSPEC is ready to race and set up out the box. this is like the 4th truck i have seen at my track have this happen too. I love my mugen but durability has always been an issue.
You need to know that the diffcase expands a bit when it gets heated up for the first time and the pinion gear wears in on the ring gear.
If you don't watch it closely, you can strip gears like you did. That's the reason why you should shim a little tight when it's brand gears. Everything will get broken in the first runs but without play. Altough it check my diff gears after every hour of running when breaking the car in.

I put 1 shim (0.2mm) on the ringgear side when building it in my buggy. And my diffgears are still in great shape after 10 months. A few months ago I changed the rear shims to 0.3mm and the front has still 0.2mm I guess. I just rebuild my car every 1 or 2 races and reshim if needed. But once the car is broken in, you should touch it for a while.
Oh and mugen is one of the most durable cars, especially the drive train. The wear is so low on the drive train compared to other cars.
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Old 04-21-2011, 10:20 AM   #33
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i did reshim after break in, added 2 more shims (3now) on ring gear side and still tatered both front and rear, and as far as their drive train being bullet proof compaired to others, my Etruggy LOSI 8 t 2.0 went 3 years without a shim running 4s and this season on 6s replaced 1 ring gear and pinion because of a severly bent rear cvd.
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Old 04-21-2011, 11:30 AM   #34
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hate to say it, but you did something wrong if you had to replace a ring gear that fast.
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Old 04-21-2011, 12:25 PM   #35
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o Just a word of advice the Mugens have spiral cut
gears,they are not straight cut like most other brands
so that being said as the gears rotate the gear mesh gets tighter.
I have never stripped gears in my Mugen on the diffs but I did not
shim them tight either.You have a drive train that rotates with
less resistant with this style of cut gears and stronger to
because you have more surface area but leave a little
back lash or you will blow diff gears....
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Old 04-21-2011, 12:53 PM   #36
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Quote:
Originally Posted by Skillett View Post
o Just a word of advice the Mugens have spiral cut
gears,they are not straight cut like most other brands
so that being said as the gears rotate the gear mesh gets tighter.
I have never stripped gears in my Mugen on the diffs but I did not
shim them tight either.You have a drive train that rotates with
less resistant with this style of cut gears and stronger to
because you have more surface area but leave a little
back lash or you will blow diff gears....
+1 , on my truggy i never needed more then 2 shims on the ringgear site.
We run on astroturf tracks around here, that means massive grip and is a torture and real test for drivetrains.
Lets say i'm glad i drive a Mugen
A little back lash is good.
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Old 04-21-2011, 03:51 PM   #37
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ya how could i have done something wrong when it was built from the factory HENCE M-SPEC, broke in brand new motor idling 2 tanks then hit the track, i noticed after the second heat when i hit the brake truck was clickin, pulled both front and rear diffs out and reshimmed them and they are totally destroyed now how did i do something wrong?> if you ask me they should have never clicked in the first place or even started to strip. pretty much every truggy at my track has went through a set of diffs right off the get go. guess im just a rooky
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Old 04-21-2011, 04:25 PM   #38
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Every mugen at your track? Or every truck at your track?

Personally if I got a factory built kit the first thing I would have checked was the diff shiming. Its cool though, you know now! That is how I learned
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Old 04-22-2011, 05:24 AM   #39
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I have only had to shim my diffs in the last couple of races, was one of the first 6T M-Specs. Never shimmed before. Took diffs apart prior to running to make sure there was fluid in them. I am pretty sure the other M-Specs at my track are/were not shimmed new.
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