Install a 16 Tooth Front Sprocket - Page 3

Vegas Street Rider · 09-15-2015, 10:47 PM

Put on the 16t sprocket on my 2009 gz. Haven't been able to take it on the beltway at higher speeds but definitely notice the difference in 1st gear and 4th since most of my riding is done at about 45mph on surface streets. I will update you all once I have had a chance to get her out on the highway. I have not noticed a need for the carb jet kit yet but I will consider it after I have ridden for a while.

itsagz250butitsmine · 08-25-2016, 08:43 PM

Thanks for the write up! The verdict is in, I just tried it out and the changes that I've experienced are that each gear adds about 5mph, which made 4th gear reach 70 now with the throttle pinned, but 5th gear had become even weaker

now 5th gear maintains the speed and ever so slowly decelerates to 60. Still, better in every way except 5th, but I was expecting as much.

Vegas Street Rider · 08-25-2016, 10:44 PM

Good news. You should eventually address the power issue though. 5th gear will add life to your engine by keeping the revs down at the higher speeds. Good luck.

Razorburns · 07-20-2017, 11:53 PM

One of the 1st things I did was put on a 16 toother (so easy to do, how could I not). I didn't get out much before the switch so I can't really comment on speeds before hand, but with the 16, I get around 65-70 mpg and comfortably hit 60. Over that it starts to get really buzzy and high revved.

Wondering about getting a 1 tooth smaller rear sprocket to take down the revs a bit more at the top end. From what I can tell, there still seems to be enough of power left, I'm just starting to run out of revs. over 65ish.

Insights?

initialtvb · 11-15-2017, 10:56 PM

So I've changed out the OEM 15T to the 16T, the problem is that I don't feel the difference.

I still have to change it at the same speed, if I wait for it to reach around 15, then the engine is revving way too high.

can anyone help me with this problem?

Please and Thank You.

Vegas Street Rider · 11-16-2017, 02:23 PM

Where you really gain with the 16t sprocket is on the higher end. There is a barely noticable advantage in 1st and 2nd but at higher cruising speeds, you can comfortably travel at 60 to 65 without the engine screaming for mercy. The big advantage to the 16t is that it will help prolong the life of the engine if you are constantly travelling at the higher speeds by reducing the rpms.

kilo0195 · 12-11-2017, 10:07 AM

I also wouldn't drop the rear sprocket any with the 16t front. It may seem like it could handle it but these bikes make very little torque stick. Losing a tooth on the rear is just going to further reduce torque and the rpm difference will be negligible imo.

wacio · 04-07-2019, 04:31 PM

I left original 15 tooth sprocket in place. These engines are not pressure lubricated (10 psi oil pump just squirts oil on the moving parts). All crank shaft bearings are roller bearings. This type engines are designed more to run at higher rpm rather than higher loads. As proven by many there is no top speed gain to be had, just weaker acceleration netting performance loss. The only reason to to the swap is to limit vibrations at cruising speed. But vibrations are minimal any way (thanks to balance shaft).

09-15-2015, 10:47 PM	#1
Vegas Street Rider Senior Member Join Date: May 2015 Location: Henderson, NV Posts: 1,089	Put on the 16t sprocket on my 2009 gz. Haven't been able to take it on the beltway at higher speeds but definitely notice the difference in 1st gear and 4th since most of my riding is done at about 45mph on surface streets. I will update you all once I have had a chance to get her out on the highway. I have not noticed a need for the carb jet kit yet but I will consider it after I have ridden for a while. Login or Register to Remove Ads
	0

08-25-2016, 10:44 PM	#3
Vegas Street Rider Senior Member Join Date: May 2015 Location: Henderson, NV Posts: 1,089	Good news. You should eventually address the power issue though. 5th gear will add life to your engine by keeping the revs down at the higher speeds. Good luck. Login or Register to Remove Ads
	0

11-15-2017, 10:56 PM	#5
initialtvb Junior Member Join Date: Nov 2017 Posts: 2	Quick Question So I've changed out the OEM 15T to the 16T, the problem is that I don't feel the difference. I still have to change it at the same speed, if I wait for it to reach around 15, then the engine is revving way too high. can anyone help me with this problem? Please and Thank You. Login or Register to Remove Ads
	0

08-25-2016, 08:43 PM	#2
itsagz250butitsmine Junior Member Join Date: Jun 2016 Location: NY, NY Posts: 10	Thanks for the write up! The verdict is in, I just tried it out and the changes that I've experienced are that each gear adds about 5mph, which made 4th gear reach 70 now with the throttle pinned, but 5th gear had become even weaker now 5th gear maintains the speed and ever so slowly decelerates to 60. Still, better in every way except 5th, but I was expecting as much.
	0

07-20-2017, 11:53 PM	#4
Razorburns Member Join Date: May 2017 Location: Portland Oregon Posts: 66	One of the 1st things I did was put on a 16 toother (so easy to do, how could I not). I didn't get out much before the switch so I can't really comment on speeds before hand, but with the 16, I get around 65-70 mpg and comfortably hit 60. Over that it starts to get really buzzy and high revved. Wondering about getting a 1 tooth smaller rear sprocket to take down the revs a bit more at the top end. From what I can tell, there still seems to be enough of power left, I'm just starting to run out of revs. over 65ish. Insights?
	0

11-16-2017, 02:23 PM	#6
Vegas Street Rider Senior Member Join Date: May 2015 Location: Henderson, NV Posts: 1,089	Where you really gain with the 16t sprocket is on the higher end. There is a barely noticable advantage in 1st and 2nd but at higher cruising speeds, you can comfortably travel at 60 to 65 without the engine screaming for mercy. The big advantage to the 16t is that it will help prolong the life of the engine if you are constantly travelling at the higher speeds by reducing the rpms.
	0

12-11-2017, 10:07 AM	#7
kilo0195 Member Join Date: Jul 2017 Location: Illinois Posts: 52	I also wouldn't drop the rear sprocket any with the 16t front. It may seem like it could handle it but these bikes make very little torque stick. Losing a tooth on the rear is just going to further reduce torque and the rpm difference will be negligible imo.
	0

04-07-2019, 04:31 PM	#8
wacio Senior Member Join Date: Apr 2016 Location: Illinois Posts: 174	I left original 15 tooth sprocket in place. These engines are not pressure lubricated (10 psi oil pump just squirts oil on the moving parts). All crank shaft bearings are roller bearings. This type engines are designed more to run at higher rpm rather than higher loads. As proven by many there is no top speed gain to be had, just weaker acceleration netting performance loss. The only reason to to the swap is to limit vibrations at cruising speed. But vibrations are minimal any way (thanks to balance shaft).
	2