How to mount a 12T 428 sprocket on a CG engine?

Mudflap · 08-30-2016, 12:35 PM

I've got a 13T on there now which required some grinding on the retainer and use of socket head screws instead of hex bolts, but would like to use a 12T. The problem with the 12T is there is not enough space for a stock type retainer as the chain plates would contact even socket head screws. The only solution that comes to mind is using a spacer behind the sprocket to hold it in the correct position, and a snap ring to hold it all in place.

Anyone have a better idea?

Weldangrind · 08-30-2016, 03:07 PM

Maybe a 520 conversion is the only way.

Mudflap · 08-30-2016, 03:34 PM

How many teeth do the newer 520 chain models have on the rear sprocket?

I got it to work by making my own keeper and grinding the socket screw heads to a smaller diameter. Gear ratio now is 3.33/1 which is better for my uses. I had been riding it for over a year with a 3.07/1 ratio but 4th gear rarely got used. The original ratio is 2.67/1 which is WAY to tall.

Weldangrind · 08-31-2016, 11:03 AM

I have no idea about the tooth count on newer China quads, 428 or 520; it was just a random thought.

Is there any opportunity to change the rear sprocket to a larger size? Got pics of your mods?

08-30-2016, 12:35 PM	#1
Mudflap Join Date: Sep 2014 Posts: 1,869	How to mount a 12T 428 sprocket on a CG engine? I've got a 13T on there now which required some grinding on the retainer and use of socket head screws instead of hex bolts, but would like to use a 12T. The problem with the 12T is there is not enough space for a stock type retainer as the chain plates would contact even socket head screws. The only solution that comes to mind is using a spacer behind the sprocket to hold it in the correct position, and a snap ring to hold it all in place. Anyone have a better idea?
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08-30-2016, 03:07 PM	#2
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Maybe a 520 conversion is the only way. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

08-31-2016, 11:03 AM	#4
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	I have no idea about the tooth count on newer China quads, 428 or 520; it was just a random thought. Is there any opportunity to change the rear sprocket to a larger size? Got pics of your mods? __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
	0

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08-30-2016, 03:34 PM	#3
Mudflap Join Date: Sep 2014 Posts: 1,869	How many teeth do the newer 520 chain models have on the rear sprocket? I got it to work by making my own keeper and grinding the socket screw heads to a smaller diameter. Gear ratio now is 3.33/1 which is better for my uses. I had been riding it for over a year with a 3.07/1 ratio but 4th gear rarely got used. The original ratio is 2.67/1 which is WAY to tall.
	0