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Century Radikal E640 - Swift 16 NX
› Another Johnson 250 question
05-02-2004 06:19 PM  13 years agoPost 1
chopperscott

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oak ridge, tn

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OK, I've tried out the Johnson 250 & it seems to have plenty of power, but I have a problem with the motor vibrating and sort of screeching at low rpm's. I think it may be due to the fact that I drilled & tapped another mounting hole without taking the case off of the motor & possibly am causing the problem due to small metal filings in the workings of the motor. Does this sound plausible; and, how do I get the case off of the motor to drill & tap it?

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05-02-2004 06:21 PM  13 years agoPost 2
ReadyHeli

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Jupiter, FL

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u dont.

buy another one.

arent they 3 bucks?

you should buy a bag of them

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05-02-2004 06:23 PM  13 years agoPost 3
chopperscott

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oak ridge, tn

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They're only $.50 cents apiece. The problem is that I tried a second one(I bought six), and it's doing the same thing.

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05-02-2004 06:41 PM  13 years agoPost 4
dragon-dude

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Minneapolis, MN - Good 'ol USA

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If it's 'squealing' you NEED to oil the bushings.

the j250 motors do not come pre-oiled nor do I think the bronze bushing are sinterized (meaning a process to impregnant oil into the bronze) :-)

I had the same problem, but I just regularly oil them with a precision oil applicator available at your local Radio shack.

taking the motor apart is a PAIN. but do-able.
That's the best way to tap the motor.

-Dan

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05-02-2004 06:55 PM  13 years agoPost 5
chopperscott

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oak ridge, tn

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OK, where exactly do I oil it?

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05-02-2004 08:18 PM  13 years agoPost 6
R0dney21

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Sacramento, CA

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I had the same problem as well, and I oiled mine, I have no idea if I did it in the right spot, but the sound went away Also make sure that the pinion is meshing witht he main gear nicely, not too tight, and not too loose. I think I had mine too tight, I noticed when I gave it a little more room I could spin it by hand a lot more smoothly and easily. These were things suggested to me after I posted a similar question.

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05-02-2004 10:06 PM  13 years agoPost 7
bobbdd

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Gardner MA.

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Oil locations

Oil them, at each end, a very tiny drop of 3 in 1 oil on the shaft,at each end. And I use a little Teflon lub on the pinion/main gear. Humms smooth as silk !

bobbdd

My HB is $500.00 worth of aggrivation, I love it !

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05-02-2004 10:29 PM  13 years agoPost 8
Yukonho

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Montreal, Quebec, Canada

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3 in 1 oil or another oil type lubricant. WD-40 is not a lubricant and will not solve the problem. Just put a drop on each bushing where the shaft comes out of the motor on each end.
co

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05-03-2004 12:29 AM  13 years agoPost 9
chopperscott

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oak ridge, tn

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Thanks guys, I'll try some oil on it.

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05-03-2004 12:54 AM  13 years agoPost 10
mdttb

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Anaheim, Calif USA

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You can replace the bushing with bearings

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05-03-2004 01:23 AM  13 years agoPost 11
bobbdd

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Gardner MA.

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Bearings ?

That looks nice, anyone "write up" how to do it yet ? where can I get the info ? Who did it ? Are they selling them ? ( they would good money for them,if they did)

bobbdd

My HB is $500.00 worth of aggrivation, I love it !

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05-03-2004 01:36 AM  13 years agoPost 12
mdttb

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Anaheim, Calif USA

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it's over on RC groups here's the
link

Bearings can be found here.

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05-03-2004 06:58 AM  13 years agoPost 13
Yukonho

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Montreal, Quebec, Canada

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My bearings are on the way. I will do a write up of how I do it. If there is enough interest I might consider selling them.
co

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05-03-2004 08:50 AM  13 years agoPost 14
bobbdd

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Gardner MA.

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I'll try out a few !

That would neat, I'd put one in the HB,and the GWS drives I use them in.

bobbdd

My HB is $500.00 worth of aggrivation, I love it !

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05-03-2004 01:26 PM  13 years agoPost 15
Yukonho

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Montreal, Quebec, Canada

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I am sure it will be easy enough to do. Probably will take less than a half an hour.
co

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05-03-2004 04:34 PM  13 years agoPost 16
Coasty

rrNovice

Sault Ste. Marie, Michigan

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If there is enough interest I might consider selling them.
Just the bearings or the converted motors? I'd like to snag a couple bearings.

Visit the Heli-Trader at http://www.ddd.communitech.net/helitrader/classifieds.cgi

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05-03-2004 04:42 PM  13 years agoPost 17
Yukonho

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Montreal, Quebec, Canada

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Probably both.
I will have to do the mod first with these bearings to make sure they work well.
co

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05-03-2004 08:35 PM  13 years agoPost 18
Coasty

rrNovice

Sault Ste. Marie, Michigan

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It would interesting to see the before and after numbers for the current draw and head RPM.

Once installed I would think that you could just recycle the motor case over and over - just replacing the nylon end with the brushes and the armature in order to get a "new" motor.

Visit the Heli-Trader at http://www.ddd.communitech.net/helitrader/classifieds.cgi

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05-03-2004 09:38 PM  13 years agoPost 19
Yukonho

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Montreal, Quebec, Canada

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Well, I just did one motor, and I am not overly impressed with the results. Honestly I think the bushed version runs smoother! I will play with it a bit and try to see what is up with it because it makes no sense.
I am going to hook up an ammeter and see if there is any difference there.
co

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Century Radikal E640 - Swift 16 NX
› Another Johnson 250 question
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