AmatureWoodsman
New member
Writing this because there may be others out there who were thinking like me, so here is a quick write up.
I have a 2022 model and I have to travel a highway to get to any gravel. At 50 mph this bike is buzzy, which makes sense, its just a 125. So I changed out the stock 39T sprocket for a 36T (JTR269.34) thinking it wouldn't make too big of a difference on the bottom end but let me cruise at 50 with a little less vibration.
Process:
I have a 2022 model and I have to travel a highway to get to any gravel. At 50 mph this bike is buzzy, which makes sense, its just a 125. So I changed out the stock 39T sprocket for a 36T (JTR269.34) thinking it wouldn't make too big of a difference on the bottom end but let me cruise at 50 with a little less vibration.
Process:
- The OEM sprocket was not hard to get off and the new one went on easily enough. JT sprocket website said it was a fit for CT125 models but it isn't perfect, I had to smack it with a rubber mallet to get it on, not scraping anything just snug. It fits in line with where the old one did so I didn't have to use spacers or anything.
- I did have to cut a link off of the chain which wasn't too big a deal but I'll have to get a new one if this doesn't work out.
- The space between the mounting holes and the edge of the nuts was not very big so the sprocket got scratched, no chance of returning it.
- I've done one ride so far and it seems like the bike has lost about 3 or 4 mph on the top end. There is almost no buzz, but the 4th gear now just barely pulls from 39 to ~46 on the speedometer but 49 on the GPS. I did not confirm the speed before hand with a GPS but my speedometer would get up to 55 (if anyone can verify that I'd appreciate it).
- There was no notable low-end power loss
- There was a notable top-end power loss
- ABS error light blinked the whole time