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2023 gearing HT 125.

SLO

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The new sprocket in rear is 3 tooth smaller. Same as changing from 14 to 13 tooth in front. Don't admit a mistake till you sell existing inventory is the mantra for sales.
 

SLO

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My dyslexia, article I read stated ,and for better off road performance, the Trail has 3 additional teeth on rear sprocket than the Cub.
 

dmonkey

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The 2023 also has a new engine that certainly results in a slightly different dyno report, so comparing gearing isn't apples to apples between the JA55 and the new 2023 JA65.
 

SLO

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I have been running 13 tooth front sprocket ,and it absolutely is better,it will go over 55 mph on slight hills,and it allows engine to rev up to allow it without hurting it.
 

SLO

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The 2023 also has a new engine that certainly results in a slightly different dyno report, so comparing gearing isn't apples to apples between the JA55 and the new 2023 JA65.
You don't need the new engine. Just put a 13 tooth front sprocket on the one you have.
 

Easty

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Dec 5, 2022
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As I only weigh 135 in the buff I think I am getting more performance on the road than the average owner. Mine seems to beg for a 5th gear. It begs for a low range in the woods though.
 

Cpd419

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Try the 13 tooth. For $10-12 bucks you can’t go wrong and if it’s not your thing it’s an easy reversal. I love it made it a different bike altogether.
 

SLO

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As I only weigh 135 in the buff I think I am getting more performance on the road than the average owner. Mine seems to beg for a 5th gear. It begs for a low range in the woods though.
You will get same speeds or better,and better performance with a 13th tooth front sprocket. Break it in before you do. Use Castrol JASO 4-T 230 W-50 W. Change it a couple times first hundred miles after using original break in procedures again. If you are nice to them when they are Ponies, They want to RUN when you mount em,and they seem to like/love it!
 

SneakyDingo

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If you're maxxing out the revs of the bike, you won't get better speeds. I went from 54 mph max speed to 51 mph with the 13T mod (7500 RPM on the OPMID), but as expected the responsiveness changes.

You might also be tempted to put a 15T on; others have done it, it will fit the bike without any modifications, it does not improve top speed on the bike without any engine modifications. There's plenty of videos that state it's actually slower than the 14T due to overgearing.

EDIT: Adding a photo.
 

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oldskool

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If you're maxxing out the revs of the bike, you won't get better speeds. I went from 54 mph max speed to 51 mph with the 13T mod (7500 RPM on the OPMID), but as expected the responsiveness changes.

You might also be tempted to put a 15T on; others have done it, it will fit the bike without any modifications, it does not improve top speed on the bike without any engine modifications. There's plenty of videos that state it's actually slower than the 14T due to overgearing.
It's almost like the engineers tried to balance the gearing out for the best performance for the average rider under average conditions. :unsure: :cool:
 

SLO

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meadowview virginia
If you're maxxing out the revs of the bike, you won't get better speeds. I went from 54 mph max speed to 51 mph with the 13T mod (7500 RPM on the OPMID), but as expected the responsiveness changes.

You might also be tempted to put a 15T on; others have done it, it will fit the bike without any modifications, it does not improve top speed on the bike without any engine modifications. There's plenty of videos that state it's actually slower than the 14T due to overgearing.
Mine will go 60 mph on straight semi flat roads,without over revving. Cannot with the 14 tooth.
 

SLO

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It goes that fast. I put YUMINASHI 143cc kit with a 238 cam. $ 256.00 delivered. Exhaust to head without choke down from head.(webike) 300 bucks, injector from 150 Honda ADV scooter,50 bucks, KN type filter,slight mod to airbox 70 bucks. Some forum member nearby can contact me,I will let them video/testify. 800 plus miles on mods,over 4500 miles on bike.
 

SneakyDingo

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Aug 6, 2021
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It goes that fast. I put YUMINASHI 143cc kit with a 238 cam. $ 256.00 delivered. Exhaust to head without choke down from head.(webike) 300 bucks, injector from 150 Honda ADV scooter,50 bucks, KN type filter,slight mod to airbox 70 bucks. Some forum member nearby can contact me,I will let them video/testify. 800 plus miles on mods,over 4500 miles on bike.

Ok, so after doing several modifications to your bike including the big bore kit you were able to hit 60 mph?

I think that's a bit misleading to say "throw on a 13T you'll go 60 mph" without adding that context. @Easty wouldn't know that at a glance. I threw up a photo of my most recent speed run (last week) to show that without modifying the bike, you're not gonna hit that. FWIW I repeated that test this morning and it was the same, only I didn't take a photo this time.
 
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