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when my riding partners and I removed the plastic chain deflection gizmo between the bike and kit on our ARO and RIOT kits, we went to 15t on the bike to 18t on the kit, and 17 top 18 bottom in the chain case. That gives you 13.5 inches of track run out. On our old TS kits and homemade kits we thought 12" of run out ideal. I was sure on my RIOT if I would like that gearing and would have to go to 16/18 chain case. Nope, the 13.5" run out is clearly superior for my 500 ktm. Makes 1st gear usable. I was just sure it would make my wide ratio transmission to gappy, not so. I must add, at the same time we rebuilt our engine covers to be really really really tight and well covered so we ran 190 degress in all conditions with heat exchangers . A 500 ktm engine runs sooo much better that way, wow. More power/taller gearing made a better snowbike setup.
I am going to try the 16 over 18 in the chain case. My bike is a YZ450 FX with an ARO3
You must be using factory chain routing? I have read multiple places that 15/18 works with the stock chain if you eliminate the chain slider and reroute.I just changed the driven sprocket in the primary from a 17 to an 18 (reducing the gear ration by 5.55%) on my ARO 3. This required a little mechanical ability...but was overall easy. I discovered that the stock chain just barely fits the 13/18 gearing...I had to move the track all the way forward...and it has relatively zero chain slack with the bike just sitting there. (Which is ok with a TSS as the chain slackens with TSS compression...but would NOT BE OK with a solid strut.) What this means is that on the standard ARO/Riot platforms...that you will need a longer primary drive chain if you want to go to the 15/18 gearing in the primary.
I have not tried the 15/18 primary gear combo with my ARO 3 because there are no available gear combos for the secondary gear set to get the overall gearing equal to, or lower geared than the stock ARO 3 gearing....therefore I can not comment on the above quote...I have not tried it.You must be using factory chain routing? I have read multiple places that 15/18 works with the stock chain if you eliminate the chain slider and reroute.
I got to run the 16 over 18 chain case gearing and like it so far . It lets my bike pull 3rd gear way more often. Seem to be able to climb a lot faster. 1st gear though is pretty much unused, except in really tight trees which I seem to find my self in more often than not.Please let us know how that goes.
Chris
If you are thinking you want to gear down some...the simplest solution is to change the top gear in the secondary from a 17 to a 16. Stock secondary gearing on an ARO 3 is 17 over 18.Thanks a ton for all the feedback. Im running a stock ARO3 on a 15 501s with some engine work that has brought back the 1/2 gear power loss from the 3" lug track but still trying to find a gearing solution.
I ordered an 18T primary after reading your first post but thinking now that flipping the secondary gears may give me a similar and simpler result to try.
I also have a few buddies that are trying out the TKI but for 1K (Canada Money) ill wait and see what they say first.
So yea I pretty much come come to the conclusion that the YZ450Fx Wide ratio sucks. It was time for an engine refresh so I grabbed a set of gears from the YZ450F and swapped them out. That jump from second to third is just too much for my liking.I got to run the 16 over 18 chain case gearing and like it so far . It lets my bike pull 3rd gear way more often. Seem to be able to climb a lot faster. 1st gear though is pretty much unused, except in really tight trees which I seem to find my self in more often than not.
Yes...they are a different pitch and size."P.S. I guess you can't quite compare apples to apples on the ARO/Riot gearing compared to the ARO 3 gearing because the primary track driver is a larger diameter/different pitch... on the ARO 3"
I was not aware that the 3" track had a different pitch track/drivers. I know the new drivers are anti-ratchet, but are they different pitch and size?
yes they are bigger"P.S. I guess you can't quite compare apples to apples on the ARO/Riot gearing compared to the ARO 3 gearing because the primary track driver is a larger diameter/different pitch... on the ARO 3"
I was not aware that the 3" track had a different pitch track/drivers. I know the new drivers are anti-ratchet, but are they different pitch and size?