How to disassemble currie throttle?

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yoyoman   1 kW

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How to disassemble currie throttle?

Post by yoyoman » Jan 30 2014 4:20am

Has anyone ever taken apart a Currie throttle from a USPD or similar bike? The throttle lever looks like it turns the pot. The wires leading to the three pins on my pot have all broken off, and I'm wondering how to take it all apart to replace the pot?

I tried pulling the lever outwards, but it doesn't budge. Failing to remove the pot, is my only recourse to get really good at soldering in tight spaces?
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dnmun   100 GW

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Re: How to disassemble currie throttle?

Post by dnmun » Jan 30 2014 7:13am

cannot see it but there may be a circlip on the inside where the spring is.

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docnjoj   100 GW

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Re: How to disassemble currie throttle?

Post by docnjoj » Jan 30 2014 9:12am

That looks like a self tapping screw next to the lever. Can it be removed?
otherDoc
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yoyoman   1 kW

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Re: How to disassemble currie throttle?

Post by yoyoman » Jan 30 2014 10:54am

I think the screw is only there to limit the range of motion of the lever.

yoyoman   1 kW

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Re: How to disassemble currie throttle?

Post by yoyoman » Jan 30 2014 4:42pm

docnjoj wrote:That looks like a self tapping screw next to the lever. Can it be removed?
otherDoc
OK, good call on removing the screw. It wasn't holding anything down, but once removed, I was able to turn the lever more, and that set everything in motion to come apart. It all happened so fast, that I'm worried about getting it all back inside.

Now, I'm going to scrape away at the blue plastic to see if I can get enough surface to solder.

atom1025   100 W

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Re: How to disassemble currie throttle?

Post by atom1025 » Jan 30 2014 10:40pm

I consider myself pretty crafty and I could not get it back together. I have two I could not get back together. Good luck.

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dnmun   100 GW

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Re: How to disassemble currie throttle?

Post by dnmun » Jan 30 2014 10:56pm

you don't need a big spring to return the throttle to stop position. use a smaller one or rubber band instead and it will be easier to reassemble. you can find the cermet trimpots on ebay too. when you get it out there will be a value printed on it.

yoyoman   1 kW

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Re: How to disassemble currie throttle?

Post by yoyoman » Jan 30 2014 11:54pm

dnmun wrote:you don't need a big spring to return the throttle to stop position. use a smaller one or rubber band instead and it will be easier to reassemble. you can find the cermet trimpots on ebay too. when you get it out there will be a value printed on it.
Mine says B552 and has a shaft. I didn't see any when I searched for "5k cermet trimpot"

dnmun   100 GW

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Re: How to disassemble currie throttle?

Post by dnmun » Jan 31 2014 12:34am

http://en.wikipedia.org/wiki/Potentiometer


cermet: ceramic metallic potentiometer

http://www.ebay.com/sch/i.html?_odkw=ce ... r&_sacat=0

post up a picture of yours when you get it out.

if you read this you will see where they show that the B means linear:
http://sound.westhost.com/pots.htm

just thought of one other thing. before removing it from the position, measure the resistance between the wiper and each end. the trimpot is single turn and may have fixed offset position and you would wanna replicate that when reinstalling the new trimpot.

yoyoman   1 kW

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Re: How to disassemble currie throttle?

Post by yoyoman » Jan 31 2014 2:55am

5k pot http://www.electric-bikes.com/bikes/diag-03.html
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eldergeekaz   1 µW

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Re: How to disassemble currie throttle?

Post by eldergeekaz » Jul 05 2016 4:30pm

I realize this is an old thread but did you (or anyone) ever find a replacement B552 5k Pot. I have looked everywhere and cannot find it. :oops:
I would rather replace the pot rather then spending $50 on the entire assembly. I've found a couple that may work with some fabbing. Usually the shaft is too short or not D-cut.....

Mine are broke off exactly like the pic above. (damn kids) :roll:

Thanks,

vitaliiokolos   1 µW

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Re: How to disassemble currie throttle?

Post by vitaliiokolos » Jan 12 2021 2:09pm

dnmun wrote:
Jan 31 2014 12:34am
http://en.wikipedia.org/wiki/Potentiometer


cermet: ceramic metallic potentiometer

http://www.ebay.com/sch/i.html?_odkw=ce ... r&_sacat=0

post up a picture of yours when you get it out.

if you read this you will see where they show that the B means linear:
http://sound.westhost.com/pots.htm

just thought of one other thing. before removing it from the position, measure the resistance between the wiper and each end. the trimpot is single turn and may have fixed offset position and you would wanna replicate that when reinstalling the new trimpot.
Newbie here. I've been trying for a few days now to understand the difference between a rheostat and a potentiometer but to no avail. I've tried to read about it on Wikipedia and even this article with a video about rheostats https://www.derf.com/rheostat-overview- ... planation/ but they don't really explain the difference in layman's terms.. Too many long words :) Could somebody here please explain the difference like I'm 5? Any and all help will be much appreciated. Thanks in advance

markz   100 GW

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Re: How to disassemble currie throttle?

Post by markz » Jan 12 2021 5:37pm

https://www.circuitstoday.com/differenc ... d-rheostat



vitaliiokolos wrote:
Jan 12 2021 2:09pm
rheostat and a potentiometer

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