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Old 06-27-2005, 07:33 AM   #1
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gearing XXXT

My son bought a new MF XXXT last fall and has cooked several moters as well as desoldered the wires several times. This past week we raced and rebilt the diff thinhking it was bad then he went out in the main and cooked a motor after leading for 4 minutes. he has the stock orange 87 tooth spur. We are looking for gearing a monster stock a P2K and a 14 single or jst some guidelines for help. I have absolutly no trouble in my T4 with gearing, so Im wondering if its a problem with something else on his truck, we also changed esc's to a novak cyclone from a cheaper LRP. Thanx in advance
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Old 06-27-2005, 08:01 AM   #2
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The orange gear for the Losi vehicles is a 90 tooth gear. That is the problem right there. It is rarely used anymore, the 86 (red) or 88 (green) are much better and fit under the gear cover without rubbing(the result of the gear cover being too small for that sized gear). That could be the entire problem, the cover rubbing the spur and putting a lot of bind on the motor causing it to heat up from so much power consumption.

Gearing suggestions for different spurs:
90 (orange) spur:
Monster stock = 19 or 20 pinion
P2K stock = 22 pinion
14X1 = 22 pinion

88 (green) spur
Monster stock = 18 or 19 pinion
P2K stock = 21 pinion
14X1 = 21 pinion

86 (red) spur
Monster stock = 17 or 18 pinion
P2K stock = 20 or 21 pinion
14X1 = 20 or 21 pinion

These are just rough estimates on the gearing. You might need to go one tooth more or one tooth less depending on your track configuration. But they should get you in the ball park of not burning up the motors.
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Old 06-27-2005, 08:44 AM   #3
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Thumbs up Thanx

Sorry for the color confusion It is a bright red not a true orange. Bt thanks for those base settings the book says to run a 20 so my son inisted he use that with the monster even though i suggested a 16 or 17. Teenagers they know everything right??? HA HA thank yo very much
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Old 06-27-2005, 09:11 AM   #4
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T Thomas is right when he says the Orange Spur is a 90 tooth.
I would ask what track you race at?
Is it indoor,Outdoor?
What rear tires do you guys use.(This will help me with what the surface is like)
How big is the track dimension wise?
Is it a fast free flowing track or is it kinda tight and twisty with a long straight away?

On gearing MOD motor's I will try to help describe what we do.
We usually gear 5-8 over the wind.5,6 over would be for tighter tracks and 7,8 would be for faster Free Flowing tracks.
OVER THE WIND means Teeth of the Pinion OVER the wind of the motor.
10 turn 6 over the wing would be a 16 tooth pinion 10+6=16
12 turn 5 over the wind would be a 17 tooth pinion 12+5=17

When it comes to stocks alot of it will be determined by Spring and Brush Combinations.Heavier Springs can usually be geared a lil higher where as softer springs usually have to be geared Lowered to help with torque.

The only thing I disagree with T Thomas on is gearing of stock.I know Tol and he's a mod guy for the most part so he may have forgot stock gearing.lol.

Get a Red Spur.It is the 86 tooth spur.
Gearing is like this on a range of stock motor's.
Reedy MVP...18-21(Depending on brush and Spring Setup and Size of track)
Orion Core/Peak Hellfire(Same Motor).18-20
Integy Atlas..18-20
Trinity Paradox...18-21
Trinity P2k...18-20
Trinity P2k2.17-19
Green Machine 3..15-17
Revenge of the Monster..16-18(usually 16,17).18 for FAST TRACK.
Binary 4 Magnet...15-17(Dont buy this motor EVER for truck)
Binary Roar Legal 2 Mag...15-17(This motor is VERY picky on gearing and ONLY good for BIG FAST FLOWING TRACKS).

If you notice above some motor's need to be geared LOWER than others.These motor's are RPMISH motor's and need to be geared lower to help with Umph or Torque out of corners or from a dead stop.
The motor's that have HIGHER gearing are usually Torquey motor's that will take some gear to help with RPM.

Most Popular Motor's
Tight Track and small to medium in size.Trinity P2k
Tight track Medium to big in size...Trinity P2k2
Fast Flowing Track BIG IN SIZE...Revenge of the Monster.
Instead of Buying TRINITY motor's I would go more for a Aftermarket Tuner that will go through the motor for you and Get it Fully Race Ready out of the package.

****NOTE****---I DO NOT practice with my race motor's.If I happen to,I practice for 6 minutes and pull it off.HEAT KILLS magnets,arms and brushes.So if you wanna Bash or Practice with a motor use a different motor than what you actually race with.
If your practicing for LONG periods of time or bashing for long periods of time even in a stock motor check out Trinity's new XXX laydown brushes.They wont be as fast as other brushes out there but they will LAST alot longer and WONT burn up like other brushes when your running for more than 5 minutes of racing.

Last but not least.Tol was right about gearing on the 14 turn.A 20 sounds great which would be 6 over.

*****TIP***** for MOST offroad racer's there is NOOOO reason to be buying Hand wound $60.00-75.00 mod motor's.Machine wound motor's are just fine for most offroad applications and less than 15-20% of racers can actually feel or tell the difference on dirt.If the only thing holding you back is motor THEN MOVE up to hand wounds.Till then Machine wounds it is.Saves you some money and they work great.

Goodluck to your son racing and I hope you enjoy racing.
*****Look me up on Ebay. I will have alot of stuff going up as 7/7/2016. User name is Dalracer.**** This is going to be a BIG ONE!!!!!!
Just wanted to say Thanks to RcTech for all these years of Great Information.
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Old 06-27-2005, 09:44 AM   #5
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Sup Les,
If you look at my gearing, they fall under your gearing suggestions. They are actually what I gear my motors of those types at just about every track I run at. But your right, it has been a long time since I ran stock.
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