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Comer K80 10 tooth drive sprocket

 
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Matt Miskoe



Joined: 27 Dec 2011
Posts: 14

PostPosted: Tue Jun 11, 2013 5:50 pm    Post subject: Comer K80 10 tooth drive sprocket Reply with quote

Has anyone fit a 10 tooth sprocket on a Comer K80?

One of the tracks my son runs at is slow enough that much of the time the motor is running down in the 5-6000rpm range, and maxes out at about 11400. Front sprocket is a 12 tooth and 90T is the biggest I dare run at the back and even that gets bent when hitting bumps.

So the Comer 50's have a 10 tooth, but it requires a custom nut to hold the drum on because the engine shaft is not long enough (the drum sticks out further on the 10 tooth than the 12).

Has anyone made the required nut to do this conversion? Because it requires a LH thread for the motor side, but a RH on the outboard side (for an offboard starter) it is an odd duck and somewhat complicated to build so I thought I would ask if anyone had done it before.
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Walt Gifford



Joined: 19 Jul 2002
Posts: 4390
Location: United States, South Jerrrsey,

PostPosted: Wed Jun 12, 2013 6:21 am    Post subject: Reply with quote

Are you good at drawing blueprints? I've been know to fab some pretty fancy starter nuts.

Gif Cool
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Last edited by Walt Gifford on Wed Jun 12, 2013 9:34 am, edited 1 time in total
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al nunley



Joined: 13 Nov 2006
Posts: 3076

PostPosted: Wed Jun 12, 2013 7:11 am    Post subject: Reply with quote

I donít know anything about that engine. Do they not make an 11 tooth sprocket? 11/83 would get you back to where you are now. At least close.
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Matt Miskoe



Joined: 27 Dec 2011
Posts: 14

PostPosted: Wed Jun 12, 2013 4:34 pm    Post subject: Reply with quote

No 11T drive sprockets, only 12 for this motor and a 10 that is made for the C50.

I have a lathe and each time I use it I get better, but before I go embarking on this I thought I would ask if anyone had done it before. It has LH threads from one end, RH from the other so it requires more tooling than some items.

Haven't measured it all up yet, the damn day job gets in the way.
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J.G. Sikes



Joined: 04 Nov 2008
Posts: 24
Location: United States, Georgia, Athens

PostPosted: Mon Jun 24, 2013 5:47 am    Post subject: Reply with quote

I have an 11 tooth for a comer 80 I will sell you. Check your Pm

Jeff
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Walt Gifford



Joined: 19 Jul 2002
Posts: 4390
Location: United States, South Jerrrsey,

PostPosted: Mon Jun 24, 2013 9:02 pm    Post subject: Reply with quote

They make a starter nut like you describe for the K125, don't know if it will fit your shaft size. give GrandProducts a call and ask for Jimmy.


Gif Cool
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Nicholson Speedway class champion 2001
Yamaha KT100 Service Center
40 years karting experience
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