17 tooth CS sprocket install, comments.

[Bike #12_imp]

I installed a 17 tooth JT countershaft sprocket on my 2013 CB1100. The original 18/39 sprocket setup had the CB geared for 163.5 mph at 8500 rpm in fifth. The 17 tooth drops the theoretical top speed to 154.5 mph at redline. I also installed a small Trail Tech tachometer to double check my data. I set up the GPS and took a ride. My observations... First, the trade off of quicker acceleration vs higher revs on the highways is well worth it imho. At 70 mph indicated (69 mph GPS) the bike showed 4000 rpms with the 18 tooth sprocket. Now it shows 4250 rpms with the 17 tooth sprocket. Actual rpm with the 17 tooth sprocket at 70 mph GPS is 3850 rpms according to the TT tachometer. I checked this information with my gearing calculator after the ride and it was spot on for accuracy. This is the second TT tachometer I've had on a bike and I consider it a great $35 piece of gear. Btw, my CB idles at 1100 rpms

The actual sprocket swap was pretty straightforward. With the bike on the center stand. Remove gearshift lever from shaft (make sure shifter is even with end of the shaft when you reinstall the bolt. There is a groove in the shaft splines for the bolt to slide through). Remove three hex head bolts to take off the plastic beauty cover. Remove two bolts from the sprocket cover and two from the clutch mechanism. Use a 14mm socket to loosen the bolt holding the sprocket in place. Press the rear brake lever to fix the sprocket in place. Once sprocket bolt is loose, use a 32 mm sprocket and a section of pipe to loosen the rear axle nut. Kick the rear tire forward a bit to put slack in the chain. Remove 18 tooth, install 17 tooth, adjust chain slack, reinstall other parts.

[CIP57_imp]

Thanks for the report. The 17 tooth may give you a bump out of the hole but a think you'll find your overall acceleration drop a bit with the shorter gears. The only way to tell would have been to time your 0-60 and 0-100 times with both gearing. I have attached a link which shows 50-100 times being slower with lower gears. The tach spins up fast but times are slower.

I'm thinking of going the other direction to see the performance difference.


[url=http://cb1100forum.com/forum/showthread.php?tid=2767&page=3]http://cb1100forum.com/forum/showthread....767&page=3

[CB4ME_imp]

Thanks Bike #12. I am going in the other direction with a 19 tooth sprocket but appreciate the steps on install.

[stray750_imp]

Thank you so much for all the info, I will be installing My 17 this weekend!

[ari cb_imp]

Hi all,

I also did this late last week and went for a ride on Sunday. I have to say, if you do most of you riding in the city or in the mountains, this mod is worth it. Off the line, the bike just launches quicker than before. Mid corners in the twisties, it feels like it is closer to its sweet RPM spot.

Total acceleration time may diminish as was said above, but the CB does feel more alive!

note: I've got PCV installed

Cheers.

Sent from my M80TA using Tapatalk

[Bike #12_imp]

The "CB feeling more alive" is a good way to describe the change in acceleration

[stray750_imp]

I installed a 17 tooth front sprocket on my bike last weekend and I absolutely love it. I agree with all of the comments in this thread, the bike feels more alive both off the line and in the corners. It also feels better at low speeds, I used to always feel like it was reving too high in first or too low in second, but now it feels just right.

I have a 2013 five speed, and yes it does rev a little high on the freeway, but I think that a 17th sprocket would be perfect on a 2014 six speed.

Here is the JT sprocket that I installed:
http://www.amazon.com/JT-Sprockets-JTF33...000GTZ168/

[mx2one_imp]

I installed a 17 tooth front sprocket on my bike last weekend and I absolutely love it. I agree with all of the comments in this thread, the bike feels more alive both off the line and in the corners. It also feels better at low speeds, I used to always feel like it was reving too high in first or too low in second, but now it feels just right.

I have a 2013 five speed, and yes it does rev a little high on the freeway, but I think that a 17th sprocket would be perfect on a 2014 six speed.

Here is the JT sprocket that I installed:
http://www.amazon.com/JT-Sprockets-JTF33...000GTZ168/

Thanks for the amazon link to the 17 tooth sprocket. Ordered mine Sat. received it today and put it on in less than 30min. What a difference. Best mod. I've done on a bike in a long time. I agree, that the revs. are a tad higher and mileage may suffer, but in my opinion it is totally worth it for the type of riding I do. Mostly backroads and around town. For freeway commuting the 6 speed with this sprocket would rock.

[OldF7Guy_imp]

Not sure what the 14 has on the front but a drop in 1 tooth could be a good thing there also. They only turn 3500 in 6th at 75 if memory serves me so a drop of one tooth in the front sprocket would not be that big of a deal but gain more performance. I would have to ride a stock one to make the determination if it was worth it or not.

[Nibis_imp]

I have this on my list of things to do to my '14.