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View Full Version : Sprocket change 46 to 43 = 5 mph top end


Skiforce75
03-24-2018, 09:03 PM
I changed my sprockets and chain today. I thought the front on the Bashan 250 was a 16 tooth but it was actually a 17 tooth. I put the new sprocket on anyway. The rear was a 46 and I changed it to a 43.

The difference was pretty amazing. Now, the bike does 65 at 7000 RPM. The winds were pretty bad today but I'm sure I could have got up to 70 with no problem on a calm day. All of my shifting has moved up at least five miles an hour.

Quite a difference for 3 teeth!

Plus, I looked at replacing the studs to the Honda studs. I actually ordered them but they didn't come in the mail even though USPS said that they were delivered.

It didn't really matter though once I put this new sprocket on the back it was extremely solid. The OE M sprocket wobbled around and was not tight on the Hub in anyway. I had to put the new one on the Hub with a mallet. Now it doesn't move at all. I have no concerns about it. Between the press-fit and the snap ring, it's not going anywhere.

Megadan
03-24-2018, 09:14 PM
Now you know why I like that 17/43 combination so much. It's just about the best road gearing you can get for these bikes.

After a little riding on that new sprocket, just make sure to check it again in a couple hundred miles to see if it is loose. When I first encountered my loose sprockt, my JT Sprocket installed tight as well, and I ended up finding it loose as well after a bit of time on the road.

Skiforce75
03-24-2018, 09:26 PM
Now you know why I like that 17/43 combination so much. It's just about the best road gearing you can get for these bikes.

After a little riding on that new sprocket, just make sure to check it again in a couple hundred miles to see if it is loose. When I first encountered my loose sprockt, my JT Sprocket installed tight as well, and I ended up finding it loose as well after a bit of time on the road.

Will do. Thanks.

Skiforce75
03-25-2018, 05:44 PM
Top speed today...71 miles per hour. Only way it is going faster is down hill or with the wind at my back!

Megadan
03-25-2018, 05:47 PM
Top speed today...71 miles per hour. Only way it is going faster is down hill or with the wind at my back!

The exact same personal best for my Hawk with the same gearing.