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Just trying to show the pictures from gpp919's post which I couldn't see the attachments. Apparently, my first attempt didn't work so let's see if this works.



 

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Nice, clear writeup Gpp, and welcome to the forum!

Just a headsup. If you change to an O-ring chain, you may need to add another washer between the sprockets for additional clearance for the wider links.
Thanks, you are correct. I thought it was okay until I got out riding for a little bit; but it did need an extra washer. I updated my original post based on this:

1.) I changed it from needing 12 washers to 18.
2.) I changed the bolt length from 35mm to 40mm accommodate the extra hardware
3.) I noted that that the sprocket protector mount would now need to be bent slight so the bolt heads on the sprockets did not rub.

Thanks again.
 

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Once the washer count is settled on they can get welded to one of the sprockets


The chain guard can we widened to accommodate different drive configurations.


A dual front sprocket can achieve the same dynamic drive ratio spread without as much changes required in the chain length. Here is a 13/15 tooth combo prototype Gerry pinned together and then welded up.
 

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Sorry to hijack this thread, but since it is dealing with rear sprockets, multiple rear sprockets, I would like to ask if anyone knows if the TW200 rear sprockets bolt pattern cross references with any other factory fitments such as a TTR or XT250/350? I am simply looking for bolt pattern cross reference. Any help would be great appreciated!
 

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I love that dual front idea.. Put that on the front AND a dual set up on the back and you can keep the chain alignment straight!
 

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YAMTW87's link is very helpfull, unfortunately tooth count ends at only 55 teeth. Some of us who go mountain goating seek 60, 65 and even 70 tooth sprockets to correct drive ratios for larger diameter ATV tires and provide needed torque multiplication for steep and technical terrain. Sourcing these gets expensive compared to more common sprockets, basic supply and demand economics works against us.
 

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Let us pause a moment and wish the best for the driving force behind all this innovation: Forum Member Gerry, a.k.a. Mr.Gizmo.

Gerry's hometown in Paradise is suffering a devastating wildfire. We hear he has been evacuated, hopefully with family and pets intact. Fate of his home and his shop where he fabricates these gems is unknown. Let's all wish for the best.
 

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Indeed, all thoughts and prayers are with Gerry.
It's not something I can really comprehend over here. We get the odd gorse and grass fires but nothing on the scale you get over there.
 

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Best wishes. I have a feeling he has prepped his property to help keep the fire at bay. At least I'm hoping he had the time to. I had a friend in Mariposa, CA that used his skid steer to clear the land around his property of combustibles while everything below him burned.
 

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Don't think Saskha would let Gerry skid steer her beautiful lush garden. His whole neighborhood was rich with trees and understory fuel load, not something easily cleared to establish defensible space. Hopefully fire swept past his neighborhood.
 

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71HarleyRearSprocket.gif

Harley Davidson Baja 100. I believe a 1971 model. I used to have one. Never changed to the smaller sprocket. Was a great idea though.
 

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Thanks! Been lurking. Finally got a brand new 2018 tw200. Looking for mods. This thread is full of great stuff. I will be doing a dual sprocket as soon as I get it broke-in.
 

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I finally got around to doing my dual sprocket setup. I'm running a 13 tooth on the front and a 44 and 62 tooth on the rear. That gives me a 5% increase in speed with the small and a 33% increase in torque with the large sprocket (over stock) It works out to a 40% difference between the two. Just took it for a Test ride, and I'm quite happy. I do have to add a small piece of chain when going to the big sprocket, but I feel that's no big deal.
 

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