Sprockets

[r80rt]

Yes I tried the 13 first, 13/39 is a 3.00 ratio, the 15/45 is also a 3.00 ratio but the sprockets should last a little longer.

 

[Migolito]

Modified Seat for Little Red Donkey:
I'll make a point to do a short Vid on the seat this week. In the mean time: I took the seat off the LRD and took it to the local Auto Upolstery shop. I had them add 1" of the Hard foam and 1 " of the soft foam to both the heigth and width. So, it raise me about 1 1/2" and spread out my contact patch. Looks just fine and it is really comfortable. All told they charged me $100. Well worth it.

 

[Spydie]

Ok then....I'm keeping the 13T cause it passed the "haul his big ass around really good' test. Yes, I'm also getting the ABS light. My question is, with stock Speedo, is some company coming out with a speedo correction thingy?

So far only Opmid is planning on building one in March, but they haven't decided if they'll ship to USA. I'll let you know. I'm in touch with them almost daily. They said they'll let me know. I also have Hard Racing working on it but they can't find the proper connector yet and I'm going to try to get them a wiring diagram so they can continue work on it.

 

[Spydie]

Yes I tried the 13 first, 13/39 is a 3.00 ratio, the 15/45 is also a 3.00 ratio but the sprockets should last a little longer.

Actually as I mentioned before, the 13/39 has better chain and sprocket wear than 15/45. I don't know, of course, if can actually be measured, but according to Gearcommander.com the 15/45 is the absolute worst you can get for chain for sprocket life. Your mileage may vary, but if you take any store in those calculations, then it's possible to pick the best combination (same gear ratio) for chain and sprocket wear. 14/42 is much better than 15/45 also.

 

[m in sc]

the tighter a radius a chain has to turn the faster it wears. I'm not sure where a smaller front sprocket will ever wear less.

 

[r80rt]

I don't take any store in those calculations. I've had several bikes with 15/45 sprocket s and I've never seen any evidence of exaggerated wear. If there is any, it's insignificant. The stock chain and 15/45 sprockets on my CT110 were 40 years old when I sold the bike.
If I were riding a heavy high speed touring bike on a round the world trip I might take that into consideration, but on a light, slow little trail bike? No.

 

[m in sc]

this isn't directed at anybody directly but since this is a discussion...
aside from wear at the front sprocket... and it does happen, final drive ratio doesn't mean squat without taking all the other ratios into account first. This is primary drive and then the other 4,5, or 6 on the transmission, and wheel size etc. Hopwever, most experienced riders can feel 'if its too high' or 'to low' to suit them.

ie: some CB750's ran 18 tooth front sprockets stock with 48 rear sprockets (2.66). whereas Z1's ran 15/35. (2.33) Smaller bikes of the era ran (like my kawasaki 120) ran 13/37 with a 59 tooth rear option for offloading (stock).

It all boils down to what its used for and what the ratios are to put the motor in that optimum operating rpm range. theres no 'magic ratio across all bikes' as they have different ratios in the motor and transmissions.. and tire height.

Me? i like the stock gearing as it does what its supposed to do for my intended purpose (run errands in town and keep up with traffic up to 45-50). I dont plan on doing much of any trail riding, but i can def see somebody who's primarily in the woods or trails a lot with it would want to run a more extreme ratio.

I mean, my old H1 had a 15/45 final drive ratio. It was def good for what i used it for.. which is the exact opposite of the 125. Its def a personal choice per bike. However, the 2 board members.. with the abs fault light blinking, is also affecting the abs functionality? Or is that not known yet. ?

 

[Spydie]

this isn't directed at anybody directly but since this is a discussion...
aside from wear at the front sprocket... and it does happen, final drive ratio doesn't mean squat without taking all the other ratios into account first. This is primary drive and then the other 4,5, or 6 on the transmission, and wheel size etc. Hopwever, most experienced riders can feel 'if its too high' or 'to low' to suit them.

ie: some CB750's ran 18 tooth front sprockets stock with 48 rear sprockets (2.66). whereas Z1's ran 15/35. (2.33) Smaller bikes of the era ran (like my kawasaki 120) ran 13/37 with a 59 tooth rear option for offloading (stock).

It all boils down to what its used for and what the ratios are to put the motor in that optimum operating rpm range. theres no 'magic ratio across all bikes' as they have different ratios in the motor and transmissions.. and tire height.

Me? i like the stock gearing as it does what its supposed to do for my intended purpose (run errands in town and keep up with traffic up to 45-50). I dont plan on doing much of any trail riding, but i can def see somebody who's primarily in the woods or trails a lot with it would want to run a more extreme ratio.

I mean, my old H1 had a 15/45 final drive ratio. It was def good for what i used it for.. which is the exact opposite of the 125. Its def a personal choice per bike. However, the 2 board members.. with the abs fault light blinking, is also affecting the abs functionality? Or is that not known yet. ?

I've seen at least three members say the ABS fault light comes on, not just two, and we'll see a lot more as more bikes get out there and guys start gearing them down. People like the developers at Opmid, who testify this is correct, know a lot more about it than we do. To answer your question, when the ABS light blinks, that means ABS is disabled. And yes, I can verify, it is disabled until you turn off the key and restart the bike. It takes exactly, exactly, 10 miles on my bike of uninterrupted highway miles to make it come on. I'm assuming that when I'm off-road riding and stopping and starting and spinning the wheel a little, that is what keeps it from faulting. So it has to be highway miles. As far as gearing goes, as I mentioned, I was using gearcommander.com to report on the calculated chain and sprocket wear. Regardless what anyone thinks, there is no definitive way to measure chain or sprocket wear without a LOT of testing and measuring, something that may or may not have ever been done, but certainly not by anyone in these forums. You can choose to believe or disbelieve calculations, just like you can choose to believe or disbelieve Einsteins calculations on the Theory of Relativity or any other calculations that have ever been invented. That is certainly a personal thing. Some people just enjoy overlooking facts because they don't want to believe them and they feel they are smarter than the guys making calculations. And maybe they are. I won't argue the point. Enjoy your bike at whatever gearing you like on it. Chances are you'll never ride it enough miles (not being a long-distance highway bike) to ever wear out a chain sprockets in the years you own it.

 

[Spydie]

I don't take any store in those calculations. I've had several bikes with 15/45 sprocket s and I've never seen any evidence of exaggerated wear.
If I were riding a heavy high speed touring bike on a round the world trip I might take that into consideration, but on a light, slow little trail bike? No.

I spoke with the Vice President at JT Sprockets and told him about the rude girl that answers the phone. Here is his reply. I though you'd get a kick out of this.

Lon

Thank you for the feedback.

If you do buy the JTR269, please follow up with me so I will have direct feedback from someone that has fitted the sprocket to the bike. You are correct, all the local Honda stores have not had one of these on hand long enough for us to go and check it.

I will try to figure out who you spoke with and do some training.

Regards,


Richard Brice
Vice President
Bike Alert Inc.
2230 Skyview Dr
Lithia Springs, Ga. 30122
T: 770 948 8880
F: 770 948 8893

 

[AZ7000']

 

[Spydie]

Here is a good, but not great copy of the wiring diagram for our bikes.

 

[Spydie]

I sat down with a JT sprockets catalog and compared sprockets till I found what I was looking for. I had to order it from England, I couldn't find one in the USA. The 41 tooth JTR269-41 is available on Ebay.

FYI, a guy I know ordered a 41t off ebay. All the measurements are correct except the holes need to be drilled out from 8.5mm to 10.5. $27. Of course he found this AFTER I ordered mine from England.

 

[Arkansas rider]

FYI, a guy I know ordered a 41t off ebay. All the measurements are correct except the holes need to be drilled out from 8.5mm to 10.5. $27. Of course he found this AFTER I ordered mine from England.

This is the 41t I ordered...."Dirt Bike/Pit Bike Rear Sprocket ACb 41 Teeth for 428 Chain in Black Color." Ebay from partsforchinesescooters

 

[r80rt]

FYI, a guy I know ordered a 41t off ebay. All the measurements are correct except the holes need to be drilled out from 8.5mm to 10.5. $27. Of course he found this AFTER I ordered mine from England.

Yep, but I wanted 45t, not 41. The holes need to be 8.5mm not 10.5, 10.5 mm is to big on my bike. As I said before, I recommend nothing, I was just telling folks what worked for me on my bike.

 

[r80rt]

This is the 41t I ordered...."Dirt Bike/Pit Bike Rear Sprocket ACb 41 Teeth for 428 Chain in Black Color." Ebay from partsforchinesescooters

Looks good, I hope it works out well for you.

 

[Arkansas rider]

This is the 41t I ordered...."Dirt Bike/Pit Bike Rear Sprocket ACb 41 Teeth for 428 Chain in Black Color." Ebay from partsforchinesescooters

This isn't the one Warro used. the bolt hole diameter of the ct125 is 10.5 mm this sprocket is 8.5mm. it is 90mm streight across hole to hole. 63mm bolt to bolt next to each other. 58mm center hole. I measured my ct125 sprocket and got the specs. The 45 T is # jtr269.45 same bolt and center hole specs.

 

[r80rt]

All I know is I used this sprocket and the 10.5 mm holes were too big, the 8.5 were the same as my stock sprocket and I used the smaller holes. Let us know how it goes, I'm interested to see, that will save a few bucks and be easy to get.

 

[Arkansas rider]

All I know is I used this sprocket and the 10.5 mm holes were too big, the 8.5 were the same as my stock sprocket and I used the smaller holes. Let us know how it goes, I'm interested to see, that will save a few bucks.

Thanks, I didn't measure bolt dia size I was going on what someone else told me on that. Just measured the distances. looks like I won't have to drill much. Just wanted to get one quicker than from the UK.

 

[r80rt]

I look forward to hearing how it goes, I have two similar that didn't work hanging on a nail in my shop. Be sure to give us the results it will be great if it goes on easy.

 

[Arkansas rider]

Will do, thanks. Have you tried x-ring chain? Wondering if it will be too wide and rub the crankcase.