Bearing for a Leapord 4074 2200kv.

[lenny]

Hi,:tiphat:

I am looking to buy some bearing to try and repair a Leapord 4074 2200kv,
Any one know where to get them at ?
The bearings numbers are, Thailand NMB R-1650 HH.
The previous owner neglected to clean it and I think it was run in salt waters.
I tried soaking it in PB blaster and cleaning with a brush and compressed air,
I put it back together and used some lite oil on the old bearing,
To try and see if what did helped any.
It sounds a little better at high rpm,
But low rpm it sounds ruff still.

Thanks for any input on the matter.:beerchug:

Hears some pictures and video.:popcorn2:


http://www.youtube.com/watch?v=sNJ34KcBOGM&feature=plcp

8786387864878658786687867

[stadiumyamaha]

Lenny
I've been able to find the right sized bearings for a motor at my local motion industries. As long as you have the correct size you should be able to find them. Check if you have a bearing supply near you.

[Basstronics]

Wow. Looks like its been dunked... Those stacks should be a nice matte silver color.

Boca bearings should have some with no minimum order. I heard the ceramic bearings are good.

Get your calipers and check the bearing size. I may have noted the bearing size and part number in the leopard Vs Tacon thread here on OSE- post #51
http://forums.offshoreelectrics.com/showthread.php?21993-leopard-vs-tacon-motors/page2&highlight=leopard+tacon

Pics in the album:
http://s38.photobucket.com/albums/e136/basstronics/RC%20Boats/?start=all

[lenny]

Hey thanks,
This is what's on the one bearing I had out. Thailand R-1650HH.



Wow. Looks like its been dunked... Those stacks should be a nice matte silver color.

Boca bearings should have some with no minimum order. I heard the ceramic bearings are good.

Get your calipers and check the bearing size. I may have noted the bearing size and part number in the leopard Vs Tacon thread here on OSE- post #51
http://forums.offshoreelectrics.com/showthread.php?21993-leopard-vs-tacon-motors/page2&highlight=leopard+tacon

Pics in the album:
http://s38.photobucket.com/albums/e136/basstronics/RC%20Boats/?start=all

[ray schrauwen]

Lenny, make sure you clean off the core and make sure there are no freyed pieces of carbon wrap. If it is freyed it can become unravelled while running.

I've been given some motors by friends to sell for them here on OSE and I always open up the front. You would be suprised how many people just let water sit inside their motors because they run leaky boats etc... "oh its hardly been run" yessss buut, it's hardly been maintained too!!

Buyer beware with used motors. Always buy from a trusted sellers that open up and maintain their equipment. If they won't show you good macro pics of the inside maybe there is rust lurking...???

[Basstronics]

Buy a better equivalent.

I think i provided a link to a spec sheet. Note the ID, OD and width and also ABEC class. Then get a decent one from Boca. I would do them both.

Wouldnt hurt to carefully take some emery cloth and clean the laminated stacks some. A good WD40 dip afterwards should help. But it looks beat man. Might be easier cheaper to buy new.

[carlcisneros]

I just replaced the 3 bearings in the 2 T-600 1400KV outrunners I have in my 47" mono using boca bearings and the
feel of the bocas are like night and day compared to what the outrunners came with.

Get some boca bearings. good stuff IMO.

[ray schrauwen]

Carl, can you PM me the part numbers for those bearings? I have a few of those motors too.

Thanks!

[lenny]

Hi,
How do I match the bearing with mine ?
This is whats on both the bearing, Thailand NMB R-1650 HH.
The size is 16.00mm x 5.00mm X 5.00mm Bore.
This is the motor cleaned up a little so far.

8788287883878848788587886





I just replaced the 3 bearings in the 2 T-600 1400KV outrunners I have in my 47" mono using boca bearings and the
feel of the bocas are like night and day compared to what the outrunners came with.

Get some boca bearings. good stuff IMO.

[Basstronics]

http://www.nmbtc.com/bearings/part-numbers/search/R-1650HH/5870

[ray schrauwen]

Looks good Lenny. Run it like you stole it!

[lenny]

Hey Ray,
On the core it is frayed a little in a grove that gos from top to bottom,
It is in the pictures I just posted.
I am waiting for a price back from them.
Part #1650 ZZ & HDR.

off the core and make sure there are no freyed pieces of carbon wrap. If it is freyed

[ray schrauwen]

Depending on which way it unravells you could be o.k. The motor spins CCWise so if the frey looks like it will unravel rotating that way it may need to be fixed. If it's the opposite way it doesn't matter, it would just flap around and do nothing.
It's hard to see. How long are the fibers sticking out?

[lenny]

They are going clock wise and are 1.30mm long,
How would I fix this if I had to ?
Epoxy it ?

87889878908789187892

[justski]

...we use to use a spray varnish

[ray schrauwen]

Well... if you were to epoxy it would have to be such a small amout that it doesn't put it out of balance. You could always buy a Castle 1515-2200kv rotor and put it in there.

If it could be trimmed down that would possibly do but, CF isn't too easy to trim off when it's that short to start.

The only epoxy i'd use would be very slow set type. Just put a light dab on, take off excess and wrap it first with a layer of parchment paper, then cardboard or something to get it to lay down. Use elastics to hold it all in place.

[lenny]

Hey,
Do you think a little spray plasti dip would be ok on the frayed core ?

[ray schrauwen]

I don't know what the stuff is like so I can't say yes or no.... I would say no because it is not designed for higher heat applications. An epoxy like West Systems or MAS is very thin and would do a better job.

[ray schrauwen]

This is not cheap but will fit and is better quality than stock:

I wish I posted it first because you get bearings with it provided they are the same size??

http://www.ebay.ca/itm/Castle-Creations-Traxxas-Summit-1200-1515-2200kv-Rotor-Replacement-Kit-CSEC1200-/200832764156?pt=US_Character_Radio_Control_Toys&hash=item2ec290c8fc

[justski]

spray it good with clear coat

[lenny]

Ok update,
The guy just sent me a almost new 3674 1900kv,
I bench tested it and it was smooth, But had a nose like a card hitting a bicycle spoke.
So this is what I found going on inside,
Making the flapping nose, It's the carbon wrap on the core.
Now I need to fix this one to.
Take a look the motor looks pretty clean for almost new.

8805688057880588805988060

[lenny]

More pic,
8806188062880638806488065

[lenny]

So what would make this happen to a new motor ?:unsure:
Could it be the salt water or the salt moisture content in the air where he runs in Alaska ? :noidea:

Thank for any input on this.:tiphat:

[justski]

superglue it down then you can spray it or if you want superglue the hole thing thats coming from my old boss that has 40 years of fixing motors

[Basstronics]

Im with the above guy. Use some thin CA glue or even medium. Just enough to glue it down and be done with that one.

[tagasagwan]

I just replaced the 3 bearings in the 2 T-600 1400KV outrunners I have in my 47" mono using boca bearings and the
feel of the bocas are like night and day compared to what the outrunners came with.

Get some boca bearings. good stuff IMO.

Carl what bearings did you buy from Boca? i have a pair of those T-600 1400kv that might need bearings in the future. thanks! stephen

[tagasagwan]

Lenny,

The motor on the pursuit sounds more like a blender than a BL motor!

[ray schrauwen]

I'm sorry, I was going to bite my tongue but, I can't.

I would never sell a motor like that 1900kv motor and call it almost new. I know Lenny, you said it is almost new but, did the guy selling it to you call it that? At best it is used very hard.

Carbon wrapped cores when heated too much will snap fibers since CF shrinks under heat. Kevlar wrapped cores expand with heat.

Since the carbon is that freyed, it was overheated/overloaded in order to get enough shrink to snap a CF wrap.

I would never ever sell a motor as "almost new" in this condition. IMO both motors are junk, fixable but, very limited life left.

You can use thin or Med CA but, a slow set epoxy or CA will hold better in the long run.

Sorry man, just my opinion, I know everyone has one... like other things...

[carlcisneros]

Tagasagwan

here ya go

http://www.bocabearings.com/bearing-inventory/16703/rc-brushless-motor-bearings/stainless-steel-standard-abec-5/turnigy-motors-t600-all

I used the BMK-005 part number. it comes with 3 bearings. 1 large and 2 small ones.

[ray schrauwen]

Thats cool, thank you as I needed this info also.

[tagasagwan]

Tagasagwan

here ya go

http://www.bocabearings.com/bearing-inventory/16703/rc-brushless-motor-bearings/stainless-steel-standard-abec-5/turnigy-motors-t600-all

I used the BMK-005 part number. it comes with 3 bearings. 1 large and 2 small ones.

Thanks Carl! This is very helpful!

[lenny]

Thanks for your input and honesty Ray.:tiphat:

But this is what he posted and also told me with pm's.
http://forums.offshoreelectrics.com/showthread.php?37845-Leaving-the-hobby!-Selling-my-entire-collection-Fast-electric-boats-parts-and-lipos
So buyers beware this could happen to you to,
I was very lucky I listened to the motor.
This could have burned, :flashfire:
The esc and cells and boat up if I ran the motors the way they seller sold them to me.








I'm sorry, I was going to bite my tongue but, I can't.

I would never sell a motor like that 1900kv motor and call it almost new. I know Lenny, you said it is almost new but, did the guy selling it to you call it that? At best it is used very hard.

Carbon wrapped cores when heated too much will snap fibers since CF shrinks under heat. Kevlar wrapped cores expand with heat.

Since the carbon is that freyed, it was overheated/overloaded in order to get enough shrink to snap a CF wrap.

I would never ever sell a motor as "almost new" in this condition. IMO both motors are junk, fixable but, very limited life left.

You can use thin or Med CA but, a slow set epoxy or CA will hold better in the long run.

Sorry man, just my opinion, I know everyone has one... like other things...