RPM/Speed

[Toolmaker Tim]

Ok everybody, what RPM does your bike run at when doing 60 mph? I've been thinking of doing the 750/850 final drive change, but the fact that my bike is a basket rebuild makes me question some of the parts that were installed by the P.O. It seems to me that 3900-3950rpms at 60 mph is a bit low! I was wondering what other bike run at so I can get a comparison. I picked 60 mph because it was a nice even number.

[DeanR]

4K @ 60

[red bandit]

3100 rpm at 60 mph. 850 final drive installed.

[Codger]

RPM'S

I'm turning 3500 at 60 mph with the 750 rear end conversion.

[Toolmaker Tim]

RPM/MPH

Thanks, that answers my question. I guess the final drive is original.

[randy]

I have the 750 FD swap, and I run 3500 in 5th at 60MPH.

[DavesXS]

Originally posted by red bandit
3100 rpm at 60 mph. 850 final drive installed.

You have the lowest rpm at 60. Is the 850 final drive the difference, or do you have a 17 or 18" wheel too? And what tire size?

What ever you have to make it turn 3100 at 60 I need that too.

[red bandit]

Don't know why mine is so low. I've clocked my speedo with a couple diff. newer vehicles. My rear tire is a Dunlop Elite 2 MT90 B17 76H Before the 850 FD swap I was running about 3600-3700 rpm at 60 mph. As far as I know the 750/850 are the same. I checked the ratio before I put the 850 on and it was what ever the 750 was. I have plenty of power to pass at 60 in 5th, course it's more fun to drop to 3rd. I get 39-40 mpg, doesn't matter if I run 60 or 85.

[dbeardslee]

The stock FD is a 3.3:1 ratio, while the 750 and 850 FD's are 2.9:1.

[DavesXS]

Ok

Dunlop Elite 2 MT90 B17 76H is a 17" tire so your running a 17" wheel. Good, because I have a 17 sitting right here waiting for me to get a 750 FD and install them at the same time.

That tire is the same as 130/90/17

[Toolmaker Tim]

If I remember correctly, the 17" wheel is the stock standard size, so I wouldn't be gaining as much in gear ratio with my 79SF. Therefore a slightly higher RPM/lower MPG. Can a 17" wheel be put on a SF? My gas milage is hovering around 33-34 mpg. I will be putting Elite 3's on soon I hope. The size would be the MT90-16's I believe. Like everyone else I am after the Holy Grail of Gas Milage.

[DavesXS]

Originally posted by Toolmaker Tim
If I remember correctly, the 17" wheel is the stock standard size, so I wouldn't be gaining as much in gear ratio with my 79SF. Therefore a slightly higher RPM/lower MPG. Can a 17" wheel be put on a SF? My gas milage is hovering around 33-34 mpg. I will be putting Elite 3's on soon I hope. The size would be the MT90-16's I believe. Like everyone else I am after the Holy Grail of Gas Milage.

Mines a special I'm putting the 17 on. I been told I need to get dust cover and spacer that goes with it.

[Toolmaker Tim]

If I'm understanding correctly, the only thing changed is the dust cover and a spacer to go to a 17? Yeah Yeah, I know, but if you use words with one syllable it's easier for me to understand