Does this sound bad?

[Lessen]

It's been a while since I've run my Lazer but I don't recall it sounding like this under braking? Is there something wrong here? My pinion/spur mesh is like perfect so I don't know why it's so loud. Or is this normal?

Kyosho Lazer
Mamba Max 5700
16T pinion

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[frickenjoey]

Strange.....how tight is your slipper clutch? But you would think if it was that it would do the same thing on take off too though.....

 

[griemar]

Strange.....how tight is your slipper clutch? But you would think if it was that it would do the same thing on take off too though.....

Transmission? It sounds like gears grinding to me. Just my opinion though.

 

[Lessen]

Strange.....how tight is your slipper clutch? But you would think if it was that it would do the same thing on take off too though.....

slipper?

That's a slipper? I thought it was a center diff? :shrug: I guess I'm sort of clueless about these Lectros.

Transmission? It sounds like gears grinding to me. Just my opinion though.

yeah, that's what I thought too. I took a look see @ the rear diff earlier before I ran it today (before the vid) and it was gravy. Maybe I should open up the front...

 

[hpinitromt]

electrics usually have a little whine to them but nothing that loud, check your diffs and tranny

 

[ohmygahitscoby]

My Lazer doesn't seem to have that sound, so it must be bad. Mine motor is the Sidewinder 5700, but both our motors are from the same company. I agree with everyone, check your transmission. If it all seems fine, my guess would be the motor.

 

[CharliesTheMan]

I didn't know you have a mamba max. You basically already have a crawler started. Now Just replace everything on the Lazer except the speed control with crawler parts, and you wont even have to justify a new rig. You will somply be modifying the old one, and since you have kids, you would really be doing it for the family anyway =devil

 

[Lessen]

I didn't know you have a mamba max. You basically already have a crawler started. Now Just replace everything on the Lazer except the speed control with crawler parts, and you wont even have to justify a new rig. You will somply be modifying the old one, and since you have kids, you would really be doing it for the family anyway =devil

... and them I could just get the HPI Wheely King crawler conversion for the Wheely King I just bought my son and we'd be good to go huh?

I think I'll tear down the front end and take a look later on this evening.

That would really suck for the motor to be going bad... It's practically brand new. I bet I don't have a dozen packs through it yet. Ahh, I'll just have to take a look at that front end... maybe it needs shimmed???

 

[HeartBreak]

Sounds like a rubbing belt. Take your pinion off and see if everything rotates freely. That'll at least eliminate your motor from the equation.

 

[Lessen]

Sounds like a rubbing belt. Take your pinion off and see if everything rotates freely. That'll at least eliminate your motor from the equation.

Well, it's a shaft-drive but I'm gonna look into a couple things here. I got one screw that is stripped so I'm waiting for the JB Weld to cure before I can take a look at the front diff.

Here's a vid of the motor under 0 load. Does that sound ok? What about the buzz under braking? Is that normal for these?

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Well, I was looking at a couple things and I realized that my spur gear seems to be eaten up a bit. I think I may have a problem with my motor shifting. Now that I think of it, the last time I had it out it was running fine then all of a sudden it wouldn't move. I had taken a look and the motor had totally moved away from the spur yet it was still tight to the mount. I suppose there is a good chance it started to eat up the spur a little before it totally lost contact. I'm pretty sure I have another spur so I will put that on and see how it sounds. Another thing I will do is put a washer on the two motor mount screws.. right now the button makes direct contact with the mount. I think it could use a little more surface contace to keep from moving around.

 

[ohmygahitscoby]

I think it is your motor. If I give mine a little throttle and release it doesn't give me that sound when I brake. I'll take a video for you if you'd like. But again, yours is a Mamba Max, mine is a Sidewinder.

 

[abadk9420]

When I was watching the video the first thing that came to mind was that your gear mesh was to tight, and after seeing the picture of your spur gear, I have to say it is the spur gear, it looks pretty chewed up, make sure when you get a new spur gear that there is just the slightest little bit of play between the pinion and spur gears, rotate the spur gear all the way around and check that there are not any spots where the pinion and spur gear get tighter.

 

[Lessen]

make sure when you get a new spur gear that there is just the slightest little bit of play between the pinion and spur gears, rotate the spur gear all the way around and check that there are not any spots where the pinion and spur gear get tighter.

I have a feeling that may be what did it possibly. I had a small mount of play but I wonder if there was a tight spot somewhere. Where it's chewed up in the picture there is the only significant area on the spur where it looks like that. It looks pretty decend the other 75% of it. I still want to get the stripped screw out and take a look at the front diff anyways but I'm definitly going to swap the spur.

 

[Rolex]

It seems okay when it's taking off, but I'd say, looking at that spur and hearing it, that it skips when it's braking. Something is not properly aligned, and soon enough, it will also start to skip on take off.

 

[HeartBreak]

Well, there's your problem chief. In addition to locking down the motor mount, if it's a metal-to-metal contact point that's sliding, you could try a SMALL drop of green threadlocker (sleeve retainer). That stuff will act like glue, and help prevent the motor from sliding.

 

[Lessen]

Interesting. I've never heard of green threadlocker before. I'll keep that in mind. Still havn't done anything with it. maybe this upcoming weekend...

 

[sweetdiesel]

Eeeesh your rig sounds horrible in the first vid. Mesh/motor alignment doesn't sound right at all, and upon deceleration the brakes don't sound right either, like there is too much drag brake. What settings do you have the Mamba Max on? Even without load it doesn't sound quite right.

 

[HeartBreak]

It's actually called "sleeve retainer". You have to get that stuff at an auto parts store. It's handy for putting pinions on the micro Mamba motors (since there's no flat spot, the green stuff acts like a glue, of sorts). You literally have to heat the stuff up with a lighter to get it to release.

 

[Lessen]

Eeeesh your rig sounds horrible in the first vid. Mesh/motor alignment doesn't sound right at all, and upon deceleration the brakes don't sound right either, like there is too much drag brake. What settings do you have the Mamba Max on? Even without load it doesn't sound quite right.

Brake/Reverse Type: Proportional w/Reverse Lockout
Brake Amount: 50%
Reverse Throttle A: 50%
Punch Control: 0%, Disabled
Drag Brake 0%, Disabled
Start Power: Low
Motor Timing: Normal
Cutoff Voltage: 6.0V
Motor Type: Brushless

 

[sweetdiesel]

Disable your low voltage cutoff since you are not using a lipo pack. It's been awhile since I've run that rig with a MM set-up but I don't recall ever using more than 25% brake, and had reverse locked out.

Have you swapped out the spur yet?