onekiwi

iTrader: (4)

Yes but depends on the track, I have a 6.5 in mine and its needed. Swapping it over from a 8.5 helped the temps as well as the top end
It helped ME might not work for others!

Jonny5

iTrader: (19)

Sensor wire maybe? Could just be motor cogging. Or, too much rear droop- does it do it only on the bench with the suspension fully drooped, or is it while driving? Sometimes with too much droop the dogbone can click on the outdrive.

P6

iTrader: (5)

on the bench only it runs fine the diff needs to be tightend a little but i dont think that would be it since it does it by spinning the spur and pinion

Cspurlock

iTrader: (31)

+1 on all of these thoughts. You won't like this answer, but I think the best thing to do is to start eliminating the potential culprits one by one. I would check into the items that Jonny5 suggested as they are common problems. If that doesn't work then try a different spur, pinion, motor, you will find the problem eventually if you keep swapping out the parts one by one. Not always the funnest to diagnose it this way, but it usually gets the job done.

Cspurlock

iTrader: (31)

I think it is probably the droop then as jonny5 suggested.
try to lift the arms a little with your hands and see if the sound goes away.

Jonny5

iTrader: (19)

Is this your first brushless? They do make an odd clicking noise when you turn them over by hand and it's completely normal.

P6

iTrader: (5)

im gonna try a different spur droop has no affect but i notice if i spin both wheels at the same time going forward or reverse the spur bounces maybe user errof and i put a washer in the wrong spot or something , the thing is super fast tho to bad i tested without a body and ripped the antenna wire down to about an inch lol good thing i already planned on upgrading from this traxxas crap

P6

iTrader: (5)

no the motor is smooth little cog sensorless but not bad and i know the feeling when u spin the rotor and it feels magnetic

Cspurlock

iTrader: (31)

I would try taking the pinion off and spining both tires forward by hand and take a look at the spur and see if it is wobbling or out of center. If it is, then your problem lies with it or somewhere in the tranny. If not, then look at the motor shaft, maybe it is bent.

P6

iTrader: (5)

thank u guys so much for all the replies everything was good , bought it used and the pitch of the spur is wrong

P6

iTrader: (5)

what spur and pinion combos are u running outdoors at leisure since i have to buy new spurs im gonna just get sets of about six each to test

Jonny5

iTrader: (19)

81 spur for sure, and I think pinion is at 25 with an 8.5 SP motor mildly boosted.

nolimit208

iTrader: (8)

I am usually at 20 timing and no boost on my home track but this track had a 160 ft front straight.
Motor was 110 degrees and speedo came off at 125 degree's after the first aaa main. others didn't count since I popped a ball cup and stopped trying just finished the race to get the pts.

Also I adjust timing when I cant get a spur/pinion to gear for what I want on a track. This track was somewhat loose so I just upped the timing and the car felt a lot more planted. I had boosted it first to go with the straight and timed later when they said their running the track dry and letting it groove up. Day 1 was wet day 2 was dry very little water at all.

nolimit208

iTrader: (8)

LOL ya 21/20 was the ride height.

nolimit208

iTrader: (8)

Mine was doing what your describing before and it ended up being my out drives i pulled them apart and re assembled them and it went away, the set pin that holds it together just wasn't seeded correctly I think.

Best of luck narrowing it down but think with all the pointers that have been given one of these should resolve it.