Sprockets

[Migolito]

When I replaced my OEM chain (w a DID 428 VX) I got the 120 link and broke the chain to OEM length, so I had links left over. I used a Rivet link to at the extra link and still use a quik link.

 

[range rat]

I don't see why it wouldn't work just fine. I chose the 15/45 because my old trail 90's came that way stock, I knew it was pretty good gearing.
I have heard of sprocket changes causing he ABS to show a fault, but I haven't experienced that. You might try 14/45 and have a happy medium?

I am running a 14/45 on my bike and i really like it. I think if I could find a 44 I would try that. The lower gearing works better for me out here in the desert where I do most of my riding. Not in a big hurry to get any where and I can still do 50MPH.

 

[r80rt]

Yeah, lower geraing is much better for me on dirt roads in the Arkansas hills

 

[zamdrang]

After 1700 miles I'm wanting a calmer motor at top speed and less buzz rather than a few mph difference on hills by going with lower gearing. I use this bike to cover ground, and even though I try to stick to dirt, long stretches of pavement are unavoidable.

I've accepted the power limitations. But the Super Cub will run down the road faster and calmer at 14/36. Surely it is possible..or will be once the aftermarket picks up.. to get more hwy comfort out of this bike right?

 

[Trick125]

UPDATE: Sprocket Changes. OEM sprockets are 14T/39T. The updated is 14T/41T.

WHY: One of the first mods I did to LRD was to switch out to a 13T front sprocket from the stock 14T. I did this because I weigh 210 pounds, AND I use the LRD for Adventure riding...which means I carry a lot of luggage, often a lotta miles. I really like the 13T sprocket. It made the throttle response much better from the standing stop, and made hills much more doable with the weight Im asking the bike to carry. The problem is the 13T turns OFF the ABS. IF all I was doing was dirt, thats not a problem. However, I do looong slab with lotsa weight and I likes the ABS.

What: Today I switched out the OEM 39T rear sprocket for a 41T aftermarket Rear sprocket. Spydie provided the link see below. I switched BACK from the aftermarket 13T Sunstar front sprocket to the OEM 14T front sprocket. I added a single chain link to allow for the increase in circumference of the 'chain loop' created by going up 2 teeth. The chain adjustment is excellent allowing the rear axle to sit at the stock location.

Results: I took LRD for a longish test ride. Maybe 3 miles. The bike operates excellent. The 13T front equates to a -7.3%(let me know if im wrong) gearing ratio compared to stock. The new ratio is -5%. So, no I don't get the increase in ration the 13T gave me, however, I keep my ABS. The ABS light did NOT come on a single time. The starting stop feels just as good, and without luggage, the hills seem just as good.



I do have a 1500+ miles adventure ride in May and will be able to do a full review of this gearing set up.

Here is the link to the sprocket I used. It fits perfect. No issues I could see. It bolts right up using the OEM nuts.

(https://www.ebay.com/itm/Dirt-Bike-Pit-Bike-Rear-Sprocket-ACb-41-Teeth-for-428-Chain-in-Black-Color/151150047877?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649).

Please tell me that you did not pay $329.99 for a sprocket??????

Not trying to be rude, but if you did, you paid about $300 too much.

 

[Dogsbody]

After 1700 miles I'm wanting a calmer motor at top speed and less buzz rather than a few mph difference on hills by going with lower gearing. I use this bike to cover ground, and even though I try to stick to dirt, long stretches of pavement are unavoidable.

I've accepted the power limitations. But the Super Cub will run down the road faster and calmer at 14/36. Surely it is possible..or will be once the aftermarket picks up.. to get more hwy comfort out of this bike right?

Don’t compare C125 and CT125 rear sprocket sizes. The CT has a different primary gear ratio.

 

[m in sc]

this is true. the auto clutch carries a different part number as well as the crankshaft, and the power delivery is definitely different, was immediately apparent riding back to back.

 

[Yinzer Moto]

I am a new owner of this bike and am just breaking it in. I think it has less than 40 miles on it so far. I am finding, with stock gearing, 4th gear is pretty useless. I have been avoiding the rev limiter but 3rd seems to carry the bike up, over 50mph. I am thinking a gearing swap is going to be very nice on this bike.

 

[bigcanoe]

The 41t sprocket listed shows up for $329.99 + $10 shipping using the link above! Did anyone find a 41 tooth JT that fits?

This one maybe?

JT Sprockets Steel Rear Sprocket JTR269.41 in Steel Rear Sprockets

Kymco 125 Pulsar II 2008-2010 JT Rear Sprocket JTR269 - 41 Tooth | eBay

'JT Sprockets' Rear Sprocket.

www.ebay.com

 

[bigcanoe]

Also, is this the correct item to keep the ABS from going haywire with a sprocket change?

https://japan.webike.net/products/24634152.html

 

[r80rt]

ABS is pretty much useless on these bikes, when I changed to 15-45 sprockets I put a piece of tape over the flashing light and forgot about it. The brake is still a brake.

 

[bigcanoe]

Good plan. The blinking light would bother me more than the no ABS!

 

[Sage44]

I'll add my own struggles and observations with the stock gearing. Upon licensing the Trail for street use I attempted to maintain the 40mph speed limit while returning home. I live in a neighborhood that sits at 6,200 feet. Heading uphill at the 5000 ft. mark, I was no longer able to maintain the 40mph speed limit. Let me add that I weigh 170lbs and have no accessories on the bike. This was my first realization that hill climbing was going to be an issue. Perhaps the 13t front sprocket would help? Negative, maximum speed was still 38mph.
That limitation ruled out using this motorcycle to commute, but quite frankly I really wanted it for trail riding in the deserts and mountains of the West. So my next day off I went out to see what the Honda Trail could do on the trail...Shock Number Two! Whenever I attempted to climb some of the significant, but not in the category crazy steep hills, I experienced the phenomena of "Bogdown" where the rear tire wont even turn and the centrifugal clutch says, "I'm done!" These were actual hills that ATV's were using, not gonzo motocross stuff. Mmmmmm....well it does get 190 miles per gallon.
My final hope is that the 45T rear sprocket that will arrive this week will do the job, According to Warro from the land down under and his youtube channel, the 13T front and 45T rear is the best combination for off road use. Fingers crossed....

 

[bigcanoe]

I am anxious to see how you like the 45T. Please post the one you bought if you get a chance. Let me know if you get an ABS flashing too please. Do you need a new chain with that combo?

 

[m in sc]

fyi it's not a centrifugal clutch.

 

[dmonkey]

There are two clutches, one is a centrifugal clutch, it's a one-way primary clutch that has weighted clutch shoes that engage when there's enough centrifugal force for them to pull the expansion springs open. That engages the disk friction clutch that's the same as in a manual transmission. Same setup as the Honda Wave if you want to see it torn down:

 

[m in sc]

ah. i stand corrected. I saw a diagram that showed different. i wasnt aware of the one off the crank. makes sense.

 

[FenixTxM3]

I am having a hard time find a 13 tooth sprocket online. Anyone able to find one? Thanks!

 

[dmonkey]

Try searching "JT Sprockets JTF273.13", they're on eBay and other sites

 

[FenixTxM3]

Try searching "JT Sprockets JTF273.13", they're on eBay and other sites

I have tried. Cannot find any in stock.