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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

8 Tooth Sprocket?


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  #1  
Old 03-31-2018, 02:26:53 AM
friday friday is offline
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Default 8 Tooth Sprocket?

anyone seen one of these sprockets before ?

8 tooth dia 1-1/2 across tips
width is 3/8 at hub
taper is 7/16 to 1/2 (1:10)
key is 3/32
pitch is 1/2"

typical taper fits straight on a splitdorf magneto shaft but I would say this is a dynamo chain drive
Miller ? BTH ? Lucas ?

cheers
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  #2  
Old 03-31-2018, 02:53:27 AM
Thaumaturge Thaumaturge is offline
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Default Re: 8 tooth sprocket ?

Sure, (I think). It looks very similar to drive sprockets used on electric scooters and pocket bikes. Although they usually have D sided, double flat side or spline drive hubs. Might check to see if pitch fits a bicycle chain (#25).
Doc
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Old 03-31-2018, 03:52:41 PM
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Default Re: 8 Tooth Sprocket?

being 1/2 pitch , 1/4 roller , its 420 or so chain .
but having a taper and key Id expect it to be driven gear not a power gear .
maybe a Indian papoose
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Old 03-31-2018, 04:31:12 PM
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Craig A Craig A is offline
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Default Re: 8 Tooth Sprocket?

The teeth look very narrow.
I'm thinking #43 chain which has 1/8" wide rollers.
#41 chain has 1/4" wide rollers.
#420 chain is extended pitch chain which has one roller every other tooth.
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Old 03-31-2018, 05:12:45 PM
Pat Barrett Pat Barrett is offline
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Default Re: 8 Tooth Sprocket?

It somewhat resembles a drive sprocket used on some gas powered reel mowers
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Old 03-31-2018, 07:40:09 PM
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Default Re: 8 Tooth Sprocket?

sorry bout that , I mean 1/4 diameter roller not width .

I see there are dynamo specific type skinny chains .
I was just looking at a chain diagram to get the #420 motorcycle reference .

I dont know how old this is , theres 3 in a zip packet which came with some Indian parts ....which doesnt mean much.

I was thinking chain saw but then theyre different sprocket again
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Old 03-31-2018, 08:32:49 PM
Craig Gillingham Craig Gillingham is offline
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Default Re: 8 Tooth Sprocket?

The 1:10 taper matches a standard magneto taper, and I think at least the Lucas generators used the same taper. As for what used a 8 tooth sprocket? I've no idea.
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