Installing an F3 89 tooth rear sprocket on my ST - does it work??

[billybovine]

So let's say I want to install the F3 89 tooth rear sprocket on my 2013 ST. I did some research and it looks like I should be able to with one exception, finding the right belt.

Here is a chart belt numbers.

2013 and earlier all models, 2014/15 RS & ST


705501576 Drive Belt


2014/15 RT


705501304 Drive Belt. Model-RT


2015 F3


705501304Drive Belt. Model-Australia, Brazil, Europe, Japan
705502157 Drive Belt. Model-North America

So what I need to know. What is the difference between the standard belt 705501576 on my ST and The belt on the 2014/15 RT? I am guessing length but not sure. If it is, how much difference?

[Chupaca]

we need a spec's chart. Could order one of each find the one that will work with the adjustment range and send the rest back... no help I know...

[finless]

Just curious, what would changing the sprocket do for you? Higher speeds at lower RPM?

Bob

[billybovine]

Just curious, what would changing the sprocket do for you? Higher speeds at lower RPM?

Bob

Higher RPM, more power on launch, less time in 4 gear on the highway.

[finless]

Interesting.... I would like to go the other way to be honest.
Here in Ca people do 75-80 on the freeway all the time. I do not like running at over 5500 RPM cruising at 75 for long distances. My ride up to Redding Ca in October I found that at 73 MPH (just under 5500 RPM) I got way better gas mileage than at 75 or over. I could easily do 150 miles at 72-73 on a tank. At 75 I only got about 130 miles.

Bob

[billybovine]

Interesting.... I would like to go the other way to be honest.
Here in Ca people do 75-80 on the freeway all the time. I do not like running at over 5500 RPM cruising at 75 for long distances. My ride up to Redding Ca in October I found that at 73 MPH (just under 5500 RPM) I got way better gas mileage than at 75 or over. I could easily do 150 miles at 72-73 on a tank. At 75 I only got about 130 miles.

Bob

There was a bigger front sprocket was available some years ago in the aftermarket. That would drop the rpm a little bit. I have not seen anything about it lately.

I live in a more rural location. Provincial secondary highways and the county I live in the speed limit is 80 kms (50 mph). In reality you will not get ticketed if you're over a little bit. But that makes for a lot of driving in 4th to keep the rpm above 4,000.