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Old 04-01-2007, 04:39 PM   #1
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Default xxx4 motor getting real hot

ok i put a checkpoint 12x2 in my xxx4 and just went to test it up and down the street made like 3 full speed passes and the motor was about on fire hot the motor is brand new just broke in the gear mesh is fine and the drivetrain is free. whats up
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Old 04-01-2007, 06:47 PM   #2
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if your running a pinion bigger than 17 that is why. i run a 16 on a 12x2 motors.
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Old 04-01-2007, 09:51 PM   #3
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Is the belt tension not to tight??
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Old 04-02-2007, 06:42 AM   #4
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it was a 18t pinon with the 92t spur so i will try lower thanks
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Old 04-02-2007, 06:48 AM   #5
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too lean?
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Old 04-02-2007, 09:50 AM   #6
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Check your belt and make sure you do not have it too tight. If it does not skip a couple of teeth on braking it is too tight. Make sure the motor cooling hole in the body is open. If you are using the old body and not the newer aurora body you will need make a cooling hole. Also, I think that 18 is alittle undergeared for this car. Did you follow the chart in the manual? I would think something like a 19 or 20 would be better. I ran an 19/92 with an orion 11T V2 and the motor ran reasonably cool.
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Old 04-02-2007, 10:22 AM   #7
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How hot was it getting? Less then 200*F is acceptable..

I agree with the 16t/92 setup. I would try that. If it still gets hot.?? I dunno maybe the motor is breaking in?
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Old 04-02-2007, 10:23 AM   #8
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Quote:
Originally Posted by sport10
Check your belt and make sure you do not have it too tight. If it does not skip a couple of teeth on braking it is too tight. Make sure the motor cooling hole in the body is open. If you are using the old body and not the newer aurora body you will need make a cooling hole. Also, I think that 18 is alittle undergeared for this car. Did you follow the chart in the manual? I would think something like a 19 or 20 would be better. I ran an 19/92 with an orion 11T V2 and the motor ran reasonably cool.
Have you seen the new H.D. Idler arm/ Pully set? The belt is not supposed to skip now!!! WooHoo
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Old 04-02-2007, 03:04 PM   #9
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Quote:
Originally Posted by Alltapdout
How hot was it getting? Less then 200*F is acceptable..

I agree with the 16t/92 setup. I would try that. If it still gets hot.?? I dunno maybe the motor is breaking in?
Using a 16/92 on a 12T brushed motor is crazy. My brother-in-law has a checkpoint 11T on his XXX-4 and runs 18/94. His motor runs 160-180 degrees depending on the heat and humidity. This guy needs to stay with the 18 or 19 tooth pinion and look somewhere else for the problem. It is not gearing. If the motor is getting hot that quick either the drivetrain is binding somewhere, the motor is faulty, or the motor is not getting enough air to properly cool.
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Old 04-02-2007, 04:16 PM   #10
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i just dont think thast the motor should of got that hot just for going up and down the street like that that quick and yes the belt skips when braking
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Old 04-02-2007, 05:28 PM   #11
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All's I'm sayin is that you should try a shorter gear, then you can tell if gearing is an issue or not, if it still runs hot. then you know its not a gearing issue.. Trial and error will fix the issue, just sayin well "my buddy runs this" and not checking it at all, will not!
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Old 04-02-2007, 06:04 PM   #12
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What I am trying to point out is that running a 16/92 gear is inconsistant to the manual. In my experience with the XXX-4 I found the manual's recommended gearing to be close to actual. According to the manual 16/92 is for 8 to 9 turn brushed motors. Running too small of a pinion can make the motor over rpm and cause heat problems too. Taking the manuals recommendation (20tooth) and the experience I have had with the 12/2 Checkpoint motor (crazy rpm) I would recommend using a 19/92 setup. I also found the 12x2 checkpoint to be a very cool running motor.

yeaklet4,

Check the slipper assembly and make sure the right amount of shims was use between the slipper and tensioner arm otherwise the arm will rub on the slipper and cause drag. Also check to see if the belt is frayed and if the strands have wrapped around the pulleys. Are you using the body that comes with the G+ version?
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